Battery pack pressure intelligent control method, device, system and storage medium

Abstract

The present disclosure provides a battery pack pressure intelligent control method, device, system and storage medium, belonging to the field of battery power supply technology, the method includes: determining a first opening threshold of an explosion-proof valve based on the battery characteristics of the battery pack and the temperature of the external environment of the battery pack; the explosion-proof valve is arranged in the battery pack; determining a first opening time when the pressure in the battery pack is equal to the first opening threshold according to the power usage law; the power usage law is the historical power usage data of the external load of the battery pack and the historical charging data of the battery pack; and controlling the opening of the explosion-proof valve according to the first opening time. The present disclosure can effectively manage and adjust the internal pressure of the battery pack and extend the battery life.

Description

Technical Field

[0001] The present disclosure belongs to the field of battery power supply technology, and more specifically, relates to a battery pack pressure intelligent control method, device, system and storage medium. Background Art

[0002] With the continuous development of technologies such as the Internet of Things and big data, intelligent management has become an important trend in the development of battery pack technology. For example, in devices such as new energy vehicles that use electricity as a power source, the battery pack will generate heat during operation, and may also cause a pressure difference inside and outside the battery box due to changes in environmental pressure. This pressure difference may damage the battery box or even cause safety issues such as explosions. Therefore, how to effectively manage and adjust the internal pressure of the battery pack to keep it balanced with the external pressure is an important technical challenge to ensure the safe operation of the battery pack. Summary of the invention

[0003] The purpose of the present disclosure is to provide a battery pack pressure intelligent control method, device, system and storage medium to effectively manage and adjust the internal pressure of the battery pack to keep it balanced with the external pressure.

[0004] According to a first aspect of an embodiment of the present disclosure, a method for intelligently controlling pressure of a battery pack is provided, comprising:

[0005] determining a first opening threshold of the explosion-proof valve based on battery characteristics of a battery pack and a temperature of an external environment in which the battery pack is located; the explosion-proof valve is disposed in the battery pack;

[0006] Determine a first start time when the pressure in the battery pack is equal to a first start threshold value according to a power usage rule; the power usage rule is historical power usage data of an external load of the battery pack and historical charging data of the battery pack;

[0007] The explosion-proof valve is controlled to open according to the first opening time.

[0008] A second aspect of the embodiments of the present disclosure provides a battery pack pressure intelligent control device, including:

[0009] a threshold determination module, configured to determine a first opening threshold of an explosion-proof valve based on battery characteristics of a battery pack and a temperature of an external environment in which the battery pack is located; the explosion-proof valve is disposed in the battery pack;

[0010] A time calculation module, used to determine a first opening time when the pressure in the battery pack is equal to a first opening threshold according to a power usage pattern; the power usage pattern is historical power usage data of an external load of the battery pack and historical charging data of the battery pack;

[0011] A valve opening module is used to control the opening of the explosion-proof valve according to the first opening time.

[0012] According to a third aspect of an embodiment of the present disclosure, a battery pack pressure intelligent control system is provided, comprising a memory, a processor, and a computer program stored in the memory and running on the processor, wherein the processor implements the steps of the above-mentioned battery pack pressure intelligent control method when executing the computer program.

[0013] According to a fourth aspect of an embodiment of the present disclosure, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the above-mentioned battery pack pressure intelligent control method are implemented.

[0014] The battery pack pressure intelligent control method, device, system and storage medium provided by the embodiments of the present disclosure have the following beneficial effects:

[0015] On the one hand, the present disclosure accurately sets the first opening threshold of the explosion-proof valve and its corresponding first opening time by comprehensively considering the battery characteristics, external ambient temperature and power consumption patterns. This can effectively avoid the potential safety hazards caused by excessive internal pressure of the battery pack and significantly enhance the safety of the battery system. At the same time, the opening of the explosion-proof valve is predicted and controlled in advance, preventing potential damage to the battery pack caused by rapid expansion of gas, extending the service life of the battery pack and reducing maintenance costs.

[0016] On the other hand, the present disclosure deeply analyzes the historical power consumption data and historical charging data of the external load of the battery pack, which can more accurately grasp the power consumption pattern of the battery pack, thereby optimizing the opening time of the explosion-proof valve. This precise control based on big data not only reduces unnecessary energy waste and improves energy utilization efficiency, but also ensures that the battery pack can provide stable power supply at critical moments, which helps to enhance the user experience, so that users do not need to worry about power outages or equipment damage caused by internal pressure problems of the battery pack, and enjoy more secure and convenient energy services. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 A schematic diagram of a flow chart of a battery pack pressure intelligent control method provided in an embodiment of the present disclosure;

[0019] Figure 2 A structural block diagram of a battery pack pressure intelligent control device provided in one embodiment of the present disclosure;

[0020] Figure 3 A schematic block diagram of a battery pack pressure intelligent control system provided in one embodiment of the present disclosure. DETAILED DESCRIPTION

[0021] In the following description, specific details such as specific system structures and technologies are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present disclosure. However, it should be clear to those skilled in the art that the present disclosure may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid obstructing the description of the present disclosure with unnecessary details.

[0022] In order to make the purpose, technical solutions and advantages of the present disclosure more clear, specific embodiments will be described below in conjunction with the accompanying drawings.

[0023] Please refer to Figure 1 , Figure 1 A flowchart of a battery pack pressure intelligent control method provided by an embodiment of the present disclosure is provided, and the method includes:

[0024] S101: Determine a first opening threshold of an explosion-proof valve based on battery characteristics of a battery pack and a temperature of an external environment in which the battery pack is located; the explosion-proof valve is disposed in the battery pack.

[0025] In this embodiment, the battery pack is a system that is composed of multiple single cells (such as lithium-ion batteries, nickel-metal hydride batteries, etc.) connected in series, parallel or hybrid to provide electrical energy. The battery pack is usually equipped with a protection circuit, a management system (such as a battery management system), and safety devices such as thermal management and safety valves.

[0026] Battery characteristics refer to the physical and chemical properties of batteries, including battery type, capacity, voltage, internal resistance, charge and discharge rate, aging degree, etc. Battery characteristics are used to evaluate the safety performance and potential risks of battery packs under specific conditions, thereby assisting in determining the opening threshold of explosion-proof valves.

[0027] External ambient temperature refers to the temperature condition of the environment in which the battery pack is located. This temperature can be affected by many factors such as season, geographical location, equipment working environment, etc. External ambient temperature is one of the important factors affecting the performance and safety of the battery pack. High temperature will accelerate the chemical reaction inside the battery and increase the risk of thermal runaway; while low temperature will affect the charge and discharge performance of the battery.

[0028] An explosion-proof valve is a safety device usually installed inside a battery pack. It is used to automatically open when the internal pressure of the battery pack rises abnormally (such as gas accumulation caused by overheating, short circuit, etc.) to release the internal pressure to prevent the battery pack from exploding.

[0029] The first opening threshold refers to the trigger point or critical value at which the explosion-proof valve starts to work under certain conditions (such as when the internal pressure of the battery pack reaches a certain level). Once this threshold is reached or exceeded, the explosion-proof valve will automatically open to release the internal pressure.

[0030] Determining a first opening threshold of the explosion-proof valve based on battery characteristics of the battery pack and a temperature of an external environment in which the battery pack is located includes:

[0031] The initial opening threshold of the explosion-proof valve is determined based on the battery type, battery capacity, charge and discharge rate and battery aging rate of the battery pack; and the initial opening threshold is changed to the first opening threshold according to the temperature of the environment where the battery pack is located.

[0032] In this embodiment, the battery capacity of battery packs of the same battery type may be different, the charge and discharge rates may be different, and the battery aging rates may not be the same. Therefore, the initial opening threshold of the explosion-proof valve is determined based on the battery type, battery capacity, charge and discharge rate, and battery aging rate of the battery pack, including:

[0033] A mapping relationship table of battery characteristics-valve opening threshold is established according to the battery type, battery capacity, charge and discharge rate and battery aging rate, and the initial opening threshold of the explosion-proof valve of the battery pack is obtained according to the mapping relationship table.

[0034] Alternatively, establish a curve between battery capacity and valve opening threshold, a curve between charge and discharge rate and valve opening threshold, and a curve between battery aging rate and valve opening threshold under different battery types; determine the initial opening threshold of the explosion-proof valve of the battery pack according to the weights of the three curves corresponding to the valve opening threshold, based on the curve between battery capacity and valve opening threshold, the curve between charge and discharge rate and valve opening threshold, and the curve between battery aging rate and valve opening threshold.

[0035] For example, referring to Table 1, it is assumed that there are three common battery types, lithium-ion battery, nickel-metal hydride battery and lead-acid battery. Lithium-ion battery:

[0036] Battery capacity range: 1000mAh-5000mAh.

[0037] Charge and discharge rate range: 0.5C-3C (C is the battery capacity rate).

[0038] Battery aging rate range: 0%-30% (as the use time increases, the new battery state is 0%, and the aging rate is 30% when the battery capacity drops to 70% of the initial capacity).

[0039] NiMH battery:

[0040] Battery capacity range: 1500mAh-4000mAh.

[0041] Charge and discharge rate range: 0.3C-2C.

[0042] Battery aging rate range: 0%-25%.

[0043] Lead-acid batteries:

[0044] Battery capacity range: 20Ah-100Ah.

[0045] Charge and discharge rate range: 0.1C-0.5C.

[0046] Battery aging rate range: 0%-20%.

[0047] Assume that the valve opening threshold range of the explosion-proof valve is 1atm-5atm (1atm is the standard atmospheric pressure).

[0048] Table 1 Mapping relationship between battery characteristics and valve opening thresholds

[0049]

[0050] For example, if the battery type is a lithium-ion battery, a curve of the relationship between battery capacity and valve opening threshold, a curve of the relationship between charge and discharge rate and valve opening threshold, and a curve of the relationship between battery aging rate and valve opening threshold are established based on sample data. The weights of the three curves corresponding to the valve opening threshold are determined through expert evaluation and practical experience. Assume that the weight of the battery capacity curve is 0.4, the weight of the charge and discharge rate curve is 0.3, and the weight of the battery aging rate curve is 0.3.

[0051] For example, for a specific group of lithium-ion batteries, the capacity is 3500mAh, the charge and discharge rate is 1.5C, and the aging rate is 15%. From the relationship curve between battery capacity and valve opening threshold, the corresponding opening threshold of 3500mAh is assumed to be 2.3atm. From the relationship curve between charge and discharge rate and valve opening threshold, the corresponding opening threshold of 1.5C is assumed to be 2.1atm. From the relationship curve between battery aging rate and valve opening threshold, the corresponding opening threshold of 15% is assumed to be 2.0atm. Then the initial opening threshold of the explosion-proof valve of the battery pack = 2.3×0.4+2.1×0.3+2.0×0.3=2.15atm.

[0052] The method of determining the first opening threshold of the explosion-proof valve based on the battery characteristics of the battery pack and the temperature of the external environment in which the battery pack is located in this embodiment can effectively prevent the risk of explosion caused by abnormal conditions such as battery overheating and overpressure. By accurately controlling the opening timing of the explosion-proof valve and releasing internal pressure and heat in time, the safety of the battery pack and the surrounding environment can be protected.

[0053] S102: Determine a first start time when the pressure in the battery pack is equal to a first start threshold value according to a power usage pattern; the power usage pattern is historical power usage data of an external load of the battery pack and historical charging data of the battery pack.

[0054] In this embodiment, the pressure inside the battery pack refers to a quantitative representation of the internal state of the battery pack, such as the state of health (SOH), remaining charge (SOC) or atmospheric pressure of the battery pack, which parameters will change with the use of the battery pack and affect its performance.

[0055] The first start threshold is a preset value or condition used to determine whether the battery pack reaches a certain state or condition. When a parameter of the battery pack (such as pressure) reaches or exceeds this threshold, a certain operation or response will be triggered.

[0056] The first start-up time refers to the time point when a certain parameter (such as pressure) of the battery pack reaches a first start-up threshold for the first time.

[0057] The power usage pattern refers to the power consumption of the battery pack under different working conditions, such as the power consumption behavior and characteristics of the external load of the battery pack (such as equipment, system) when using the battery pack. It can be obtained by analyzing historical power consumption data, including power consumption time, power consumption, power consumption cycle, etc. By analyzing the power consumption pattern, future power demand can be predicted, and the explosion-proof valve can be opened in advance to ensure the safe operation of the battery pack. Historical power consumption data refers to the record of data such as the actual power consumption, power consumption time, power consumption mode, etc. of the external load of the battery pack in the past period of time. The power usage pattern also refers to the historical charging data of the battery pack over a period of time.

[0058] Determining a first start time when the pressure in the battery pack is equal to a first start threshold value according to the power usage law includes: determining a relationship between a power parameter of a load external to the battery pack and the pressure in the battery pack based on the power usage law;

[0059] The first start-up time when the pressure in the battery pack is equal to the first start-up threshold is determined according to the relationship between the power parameter of the load external to the battery pack and the pressure in the battery pack.

[0060] Alternatively, the first start-up time when the pressure in the battery pack is equal to the first start-up threshold is determined according to historical power consumption, historical power consumption time, historical power consumption mode and historical charging data.

[0061] Exemplarily, the power consumption data of the battery pack in different time periods in the past month is collected. For example, the power consumption in four time periods of 0:00 to 6:00, 6:00 to 12:00, 12:00 to 18:00, and 18:00 to 24:00 is recorded in kilowatt-hours. Differentiate the power consumption in different power consumption scenarios, such as normal working state, high-load operating state, etc. Record the start time and end time of each power consumption in detail, accurate to the hour. Determine the main power consumption mode, such as continuous power consumption mode, intermittent power consumption mode, peak power consumption mode, valley power consumption mode, etc. Record the starting power, end power, charging time and charging method (fast charging, slow charging, etc.) of each charge.

[0062] Through experiments and data analysis, determine the changes in the internal pressure of the battery pack under different power consumption. For example, when the power consumption is large, the chemical reaction inside the battery pack intensifies, which may cause the pressure to rise. Assume that after testing, it is found that when the power consumption increases by 10 kWh, the pressure may rise by 0.2 atm. Analyze the change pattern of the battery pack pressure in different power consumption time periods. It may be found that the pressure changes more significantly in some time periods due to factors such as ambient temperature. For example, on a hot afternoon, the battery pack pressure may rise faster than on a cool morning. Analyze the impact of different power consumption modes on the battery pack pressure. For example, in the continuous high-load power consumption mode, the internal temperature of the battery pack rises quickly and the pressure rises quickly; while in the intermittent power consumption mode, the battery pack has a certain amount of heat dissipation time, and the pressure rises relatively slowly. Based on historical charging data, determine the changes in the battery pack pressure during the charging process. For example, during fast charging, due to the large current, the internal temperature and pressure of the battery pack may rise quickly; during slow charging, the pressure rises relatively slowly.

[0063] The first opening threshold is determined to be 1.5atm. First, analyze the current power consumption in combination with historical data. For example, the current power consumption mode is continuous high load, and the power consumption is large. According to historical data, the pressure rises faster in this case. Assume that the pressure may rise by 0.1atm per hour. Then, determine the initial pressure of the current battery pack. Assume that the current pressure is 1atm. Calculate the time required for the pressure to rise from the current value to the first opening threshold. According to the pressure rise rate, the time required is calculated as (1.5atm-1atm) ÷ 0.1atm / hour = 5 hours. In practical applications, historical data can be continuously updated and the relationship model can be optimized to improve the accuracy of the first opening time prediction.

[0064] S103: Controlling the explosion-proof valve to open according to the first opening time.

[0065] In this embodiment, the processor can be used to monitor time conditions, system status, and send control signals. The first opening time can be set by a timer or clock module. The explosion-proof valve as an actuator can receive the control signal sent by the processor and control the opening or closing of the valve according to the control signal.

[0066] When the battery pack is in different working modes, the explosion-proof valve can be controlled to open in advance based on the first opening time to prevent the gas in the battery pack from expanding rapidly and damaging the battery due to the untimely opening of the explosion-proof valve.

[0067] For example, the battery pack has different working modes, such as normal charging mode, discharging mode, and idle mode. Assume that based on factors such as historical power consumption, power consumption time, and power consumption mode, it is calculated that the first opening time when the pressure in the battery pack is equal to the first opening threshold in the current working mode is 30 minutes. The processor starts counting down through a timer or a clock module and monitors the remaining time in real time.

[0068] If the battery pack is in charging mode, according to the current power consumption pattern, when the explosion-proof valve is opened at the first opening time, the pressure value in the battery pack is relatively large and it is difficult to reduce it in a short time. Therefore, in order to more easily reduce the pressure in the battery pack and extend the service life of the battery, the explosion-proof valve can be opened 10 minutes in advance.

[0069] If the battery pack is in discharge mode, when the battery is discharged to less than 30% of the full voltage, as the discharge time increases, the internal temperature of the battery rises and the pressure increases. According to the current power consumption rules, when the explosion-proof valve is opened at the first opening time, the pressure value in the battery pack is relatively large and it is difficult to reduce it in a short time. Therefore, in order to more easily reduce the pressure in the battery pack and extend the service life of the battery, the explosion-proof valve can be opened 5 minutes in advance.

[0070] From the above, it can be concluded that, on the one hand, this embodiment accurately sets the first opening threshold of the explosion-proof valve and its corresponding first opening time by comprehensively considering the battery characteristics, external ambient temperature and power consumption patterns. This can effectively avoid the safety hazards caused by excessive internal pressure of the battery pack and significantly enhance the safety of the battery system. At the same time, the opening of the explosion-proof valve is predicted and controlled in advance, which prevents potential damage to the battery pack caused by rapid expansion of gas, prolongs the service life of the battery pack, and reduces maintenance costs.

[0071] On the other hand, this embodiment deeply analyzes the historical power consumption data and historical charging data of the external load of the battery pack, which can more accurately grasp the power consumption pattern of the battery pack, thereby optimizing the opening time of the explosion-proof valve. This precise control based on big data not only reduces unnecessary energy waste and improves energy utilization efficiency, but also ensures that the battery pack can provide stable power supply at critical moments, which helps to enhance the user experience, so that users do not need to worry about power outages or equipment damage caused by internal pressure problems in the battery pack, and enjoy more secure and convenient energy services.

[0072] In one embodiment of the present disclosure, determining the first start-up time when the pressure in the battery pack is equal to the first start-up threshold according to the power usage law includes:

[0073] Determine the relationship between the power parameters of the external load of the battery pack and the pressure in the battery pack based on the power usage pattern;

[0074] The first start-up time when the pressure in the battery pack is equal to the first start-up threshold is determined according to the relationship between the power parameter of the load external to the battery pack and the pressure in the battery pack.

[0075] In this embodiment, the power usage pattern refers to the power consumption or generation pattern of the battery pack in different working states (such as charging, discharging, standby, etc.). These patterns are affected by many factors, such as load type, load size, working time, ambient temperature, etc. Power parameters mainly include current, voltage, power, etc. These parameters directly reflect the power output of the battery pack.

[0076] This embodiment can use statistical methods to analyze the correlation between the power parameter data and the internal pressure data of the battery pack. For example, first, by calculating the correlation coefficient, drawing a scatter plot, etc., it is preliminarily determined whether there is a significant linear or nonlinear relationship between them. Secondly, based on the results of the correlation analysis, a suitable mathematical model is selected to describe the relationship between the power parameters of the external load of the battery pack and the internal pressure. This model may be the result of formula derivation based on physical principles, or it may be an empirical formula obtained by data fitting. Finally, verify the model: use new experimental data or actual operation data to verify the established model. The accuracy and reliability of the model are evaluated by comparing the differences between the model prediction results and the measured results.

[0077] This embodiment can also directly input the power usage law into the neural network model to obtain the relationship between the power parameters of the external load of the battery pack and the pressure in the battery pack. This method can efficiently predict the relationship between the power parameters of the external load of the battery pack and the internal pressure by directly inputting the power usage law into the neural network model, significantly improving the prediction accuracy and real-time performance, providing strong technical support for the safety monitoring and performance optimization of the battery pack, and ensuring the stable operation and safety of the battery system. The real-time monitored external load power parameters are input into the previously established mathematical model or neural network model and other relationship models, and the model is used to predict the pressure change trend in the battery pack under the current load power parameters. According to the prediction results, it is determined when the pressure in the battery pack will reach the set first opening threshold, and this time point is the first opening time. When it is predicted that the pressure in the battery pack is about to reach the first opening threshold, an early warning signal can be issued in time, and necessary intervention measures can be taken, such as adjusting the external load, reducing the charge and discharge rate, or starting the cooling system, etc., to control the pressure rise rate in the battery pack. If the pressure in the battery pack continues to rise and exceeds the safety range, the explosion-proof valve can be opened to discharge the gas generated in the battery pack.

[0078] From the above, it can be concluded that this embodiment establishes a dynamic relationship model between the power parameters of the external load and the internal pressure of the battery pack by accurately analyzing the power consumption pattern, so as to accurately predict and determine the time point (first opening time) when the pressure inside the battery pack reaches the first opening threshold. This method not only improves the intelligent level of battery pack safety management, but also enhances the predictability and response speed of the system, effectively ensures the safe and stable operation of the battery pack, prolongs the service life, reduces maintenance costs, and improves overall energy efficiency.

[0079] In one embodiment of the present disclosure, determining the relationship between the power parameter of the external load of the battery pack and the pressure in the battery pack based on the power usage law includes:

[0080] The power consumption pattern is input into the neural network model to obtain the relationship between the power parameters of the external load of the battery pack and the pressure inside the battery pack.

[0081] In this embodiment, the external load power parameter data of the battery pack under different power usage patterns, including voltage, current, power, etc., are collected; at the same time, the pressure data inside the battery pack at the corresponding time point is recorded. The collected data is cleaned, noise and outliers are removed, and the data is normalized so that the neural network model can better process it.

[0082] Select a suitable neural network model based on the characteristics of the data, such as Multi-Layer Perceptron (MLP), Convolutional Neural Network (CNN) or Recurrent Neural Networks (RNN) models. After determining the neural network model, you can further determine the number of neural network layers, the number of nodes in each layer, the activation function and other parameters. Select appropriate optimization algorithms and loss functions to adjust model parameters during training to minimize prediction errors. Divide the historical electricity consumption data into training set, validation set and test set, and train the neural network model based on these three data sets.

[0083] Through the above steps, when the power consumption pattern of the current period is input into the trained neural network model, the relationship between the power parameters of the external load of the battery pack and the pressure inside the battery pack can be obtained, and then the first start-up time when the pressure inside the battery pack is equal to the first start-up threshold can be determined.

[0084] From the above, it can be concluded that this embodiment uses a neural network model to process power consumption patterns, accurately establishes the relationship between the power parameters of the external load of the battery pack and the internal pressure, realizes intelligent prediction and control, improves the safety and efficiency of the battery pack operation, and reduces the risk of failure caused by abnormal pressure.

[0085] In one embodiment of the present disclosure, controlling the explosion-proof valve to open according to the first opening time includes:

[0086] In response to the battery pack being in a charging mode, controlling the explosion-proof valve to open for a first time period in advance based on the first opening time;

[0087] In response to the battery pack being in a discharge mode, controlling the explosion-proof valve to open for a second time period in advance based on the first opening time;

[0088] The first duration is longer than the second duration.

[0089] In this embodiment, the advance opening time of the explosion-proof valve is different in different working modes of the battery pack (charging mode and discharging mode), mainly because there are significant differences in the physical and chemical processes occurring inside the battery pack in these two modes, and these differences affect the speed and degree of change of the internal pressure of the battery pack.

[0090] During the charging process, the electrolyte decomposition, gas generation (such as hydrogen, oxygen, etc.) and electrode material expansion will occur inside the battery. These processes are usually more intense than during discharge, causing the internal pressure of the battery to rise rapidly. Therefore, in order to release excessive pressure in time and prevent battery damage or even explosion, the system needs to control the opening of the explosion-proof valve in advance by a relatively long first time based on the first opening time to ensure safety.

[0091] Compared with the charging process, the reaction inside the battery during discharge is relatively mild, and the amount of gas produced and the pressure change are also small. Although there is still an increase in pressure due to factors such as temperature increase during the discharge process, the overall speed and amplitude of the pressure increase are lower than the charging process. Therefore, in the discharge mode, the system can control the opening of the explosion-proof valve in advance for a relatively short second period of time, which can not only ensure safety, but also avoid energy loss and efficiency loss caused by excessive opening of the explosion-proof valve.

[0092] From the above, it can be concluded that by adjusting the advance opening time of the explosion-proof valve according to different working modes, the actual pressure changes inside the battery pack can be better matched, more precise pressure control can be achieved, and the safety and operating efficiency of the battery pack can be improved.

[0093] In one embodiment of the present disclosure, the battery pack includes a first power supply unit and a second power supply unit, each power supply unit corresponds to an explosion-proof valve;

[0094] In response to the battery pack being in a charging mode, controlling the explosion-proof valve to open for a first time period in advance based on the first opening time includes:

[0095] In response to the first power supply unit being in the charging mode and the second power supply unit being in the sleep mode, the first explosion-proof valve corresponding to the first power supply unit is controlled to be opened in advance by a first time length based on the first opening time, and the second explosion-proof valve corresponding to the second power supply unit is controlled to be opened in advance by a third time length;

[0096] The first duration is longer than the third duration.

[0097] In this embodiment, the battery pack includes a first power supply unit and a second power supply unit. When the power demand is not high, the two power supply units can supply power in turn to save energy and extend the battery life.

[0098] When the battery pack is in the power supply mode, the first power supply unit can be selected to supply power and the second power supply unit can be selected to be in sleep mode; or the first power supply unit can be selected to be in sleep mode and the second power supply unit can be selected to be in power supply. Assume that the first power supply unit is in the charging mode and the second power supply unit is in the sleep mode. In this case, the first power supply unit will generate a higher internal pressure during the charging process, so it is necessary to open its corresponding first explosion-proof valve in advance to release the pressure. Because the first power supply unit and the second power supply unit are both in the same battery pack, when the temperature of the first power supply unit rises, the second power supply unit will be affected, so it is also necessary to open the corresponding second explosion-proof valve in advance. At the same time, because the second power supply unit is in the sleep mode, its internal pressure changes little, so the corresponding second explosion-proof valve only needs to be opened for a third time period (less than the second time period) in advance.

[0099] From the above, it can be concluded that by opening the explosion-proof valve in advance, the system can more effectively manage the pressure generated by the battery pack during charging, thereby reducing the safety risk caused by excessive internal pressure. At the same time, opening the explosion-proof valve in advance for the dormant power supply unit helps reduce unnecessary energy loss and extend battery life.

[0100] In response to the battery pack being in the charging mode, the explosion-proof valve is controlled to be opened in advance for a first time period based on the first opening time, and further includes:

[0101] In response to the battery pack being in charging mode, the explosion-proof valve is controlled to open for a first time period in advance based on the first opening time according to the working modes of the first power supply unit and the second power supply unit and the supply voltages of the first power supply unit and the second power supply unit.

[0102] If the supply voltage of the first power supply unit is greater than the supply voltage of the second power supply unit, and both the first power supply unit and the second power supply unit are in the charging mode, then based on the first opening time and according to the voltage ratio of the first power supply voltage to the second power supply voltage, the first explosion-proof valve corresponding to the first power supply unit is controlled to be opened in advance by the fifth time length, and the second explosion-proof valve corresponding to the second power supply unit is controlled to be opened in advance by the sixth time length. The fifth time length is greater than the sixth time length.

[0103] If the supply voltage of the first power supply unit is greater than the supply voltage of the second power supply unit, the first power supply unit is in the power supply mode, and the second power supply unit is in the sleep mode, then based on the first opening time, the first explosion-proof valve corresponding to the first power supply unit is controlled to open in advance by the seventh time length, and the second explosion-proof valve corresponding to the second power supply unit is controlled to open in advance by the eighth time length. The seventh time length is greater than the eighth time length.

[0104] If the supply voltage of the first power supply unit is greater than the supply voltage of the second power supply unit, the first power supply unit is in a sleep mode, and the second power supply unit is in a charging mode, then the first explosion-proof valve corresponding to the first power supply unit is controlled to be opened in advance by the ninth time period based on the first opening time, and the second explosion-proof valve corresponding to the second power supply unit is controlled to be opened in advance by the tenth time period. The ninth time period and the tenth time period are calculated based on the voltage ratio of the first power supply voltage to the second power supply voltage and the corresponding preset time periods in different modes.

[0105] From the above, it can be concluded that this embodiment comprehensively considers the voltage and working mode of the power supply unit, accurately adjusts the advance opening time of the explosion-proof valve, effectively responds to the changes in the internal pressure of the battery pack under different working conditions, and ensures safety and optimizes efficiency. In particular, the advance time is flexibly calculated according to the voltage ratio and the preset time, realizing a more sophisticated pressure management strategy and improving the overall stability and reliability of the battery pack.

[0106] In one embodiment of the present disclosure, the battery pack pressure intelligent control method further includes:

[0107] After the explosion-proof valve is opened, the closing time of the valve is determined based on the pressure and temperature in the battery pack.

[0108] In this embodiment, the explosion-proof valve can be closed when the pressure in the battery pack is less than a preset pressure threshold and the temperature is less than a preset temperature threshold. The pressure and temperature data in the battery pack can be collected in real time by a pressure sensor and a temperature sensor installed inside the battery pack. When the system determines that the pressure has dropped to a safe range and the temperature is at an appropriate level, the explosion-proof valve can be considered to be closed.

[0109] From the above, it can be concluded that by real-time monitoring of the pressure and temperature inside the battery pack and closing the explosion-proof valve at the appropriate time, the internal pressure of the battery pack can be prevented from being too low or the temperature dropping abnormally, thereby protecting the battery pack from potential damage. This dynamic adjustment mechanism ensures the safety of the battery pack during charging or operation.

[0110] Precise control of closing time helps reduce unnecessary energy loss and gas emissions, thereby optimizing the overall performance of the battery pack. Excessive opening of the explosion-proof valve may lead to energy waste and reduced battery pack efficiency, while timely closing can keep the battery pack in optimal working condition.

[0111] The battery pack pressure intelligent control method provided in this embodiment can adapt to the changes in pressure and temperature inside the battery pack under different working conditions, and ensure that the battery pack can maintain optimal performance and safety in various usage scenarios through real-time analysis and dynamic adjustment. This enhanced adaptability makes the method have a wider application prospect in the fields of electric vehicles, energy storage systems, etc.

[0112] In one embodiment of the present disclosure, determining the closing time of the valve based on the pressure and temperature in the battery pack includes:

[0113] When the pressure in the battery pack is less than a first proportion of the first opening threshold and the temperature in the battery pack is less than a first temperature, controlling the explosion-proof valve to close;

[0114] When the pressure in the battery pack is less than a first proportion of the first opening threshold and the temperature in the battery pack is greater than or equal to the first temperature, the explosion-proof valve is controlled to close after a fourth time delay.

[0115] In this embodiment, when the pressure in the battery pack is less than the first ratio of the first opening threshold and the temperature in the battery pack is less than the first temperature, the explosion-proof valve is controlled to close. In this case, the pressure in the battery pack has been significantly reduced and has dropped below a certain ratio of the first opening threshold (this ratio is pre-set and is used to determine whether the pressure has returned to a safe level). At the same time, the temperature in the battery pack is also lower than the set first temperature threshold, which indicates that not only the pressure of the battery pack is effectively controlled, but also the temperature is within a safe range. Therefore, the system determines that the explosion-proof valve can be safely closed at this time to avoid unnecessary energy loss and potential risks.

[0116] When the pressure in the battery pack is less than the first ratio of the first opening threshold value, and the temperature in the battery pack is greater than or equal to the first temperature, the explosion-proof valve is controlled to close after a delay of the fourth time period. In this case, the pressure in the battery pack has also been reduced to a safe level. However, the difference from the above situation is that the temperature in the battery pack is higher, reaching or exceeding the set first temperature threshold. This may be due to the fact that the heat generated by the battery pack during charging or discharging has not been fully dissipated, or the ambient temperature is high. In this case, if the explosion-proof valve is closed immediately, it may cause safety risks due to the continued increase in temperature. Therefore, the system can delay the explosion-proof valve for the fourth time period (this time period is pre-set to wait for the temperature to drop to a safe level). This can not only ensure the stability of the internal pressure of the battery pack, but also avoid the potential hazards caused by excessive temperature.

[0117] It can be concluded from the above that this embodiment improves the accuracy of battery pack safety control and avoids the risks that may be caused by closing the explosion-proof valve too early or too late. At the same time, the closing time is flexibly adjusted according to the temperature conditions, which not only ensures the stability of the internal pressure of the battery pack, but also prevents the influence of abnormal temperature on the battery pack, thereby improving the overall performance and safety of the battery pack.

[0118] Corresponding to the battery pack pressure intelligent control method of the above embodiment, Figure 2 This is a structural block diagram of a battery pack pressure intelligent control device provided by an embodiment of the present disclosure. For ease of explanation, only the parts related to the embodiment of the present disclosure are shown. Figure 2The battery pack pressure intelligent control device 20 includes: a threshold determination module 21, a time calculation module 22, and a valve opening module 23.

[0119] The threshold determination module 21 is used to determine the first opening threshold of the explosion-proof valve based on the battery characteristics of the battery pack and the temperature of the external environment of the battery pack; the explosion-proof valve is arranged in the battery pack;

[0120] A time calculation module 22, used to determine a first start time when the pressure in the battery pack is equal to a first start threshold value according to a power usage pattern; the power usage pattern is historical power usage data of an external load of the battery pack and historical charging data of the battery pack;

[0121] The valve opening module 23 is used to control the opening of the explosion-proof valve according to the first opening time.

[0122] In one embodiment of the present disclosure, the time calculation module 22 is specifically used for:

[0123] Determine the relationship between the power parameters of the external load of the battery pack and the pressure in the battery pack based on the power usage pattern;

[0124] The first start-up time when the pressure in the battery pack is equal to the first start-up threshold is determined according to the relationship between the power parameter of the load external to the battery pack and the pressure in the battery pack.

[0125] In one embodiment of the present disclosure, the time calculation module 22 is specifically used for:

[0126] The power consumption pattern is input into the neural network model to obtain the relationship between the power parameters of the external load of the battery pack and the pressure inside the battery pack.

[0127] In one embodiment of the present disclosure, the valve opening module 23 is specifically used for:

[0128] In response to the battery pack being in a charging mode, controlling the explosion-proof valve to open for a first time period in advance based on the first opening time;

[0129] In response to the battery pack being in a discharge mode, controlling the explosion-proof valve to open for a second time period in advance based on the first opening time;

[0130] The first duration is greater than the second duration. In one embodiment of the present disclosure,

[0131] In one embodiment of the present disclosure, the battery pack includes a first power supply unit and a second power supply unit, each power supply unit corresponds to an explosion-proof valve;

[0132] The valve opening module 23 is specifically used for:

[0133] In response to the first power supply unit being in the charging mode and the second power supply unit being in the sleep mode, the first explosion-proof valve corresponding to the first power supply unit is controlled to be opened in advance by a first time length based on the first opening time, and the second explosion-proof valve corresponding to the second power supply unit is controlled to be opened in advance by a third time length;

[0134] The first duration is longer than the third duration.

[0135] In one embodiment of the present disclosure, the valve opening module 23 is also used to:

[0136] After the explosion-proof valve is opened, the closing time of the valve is determined based on the pressure and temperature in the battery pack.

[0137] In one embodiment of the present disclosure, the valve opening module 23 is further used to:

[0138] When the pressure in the battery pack is less than a first proportion of the first opening threshold and the temperature in the battery pack is less than a first temperature, controlling the explosion-proof valve to close;

[0139] When the pressure in the battery pack is less than a first proportion of the first opening threshold and the temperature in the battery pack is greater than or equal to the first temperature, the explosion-proof valve is controlled to close after a fourth time delay.

[0140] See also Figure 3 , Figure 3 This is a schematic block diagram of a battery pack pressure intelligent control system provided by an embodiment of the present disclosure. Figure 3 The battery pack pressure intelligent control system 300 in the embodiment shown may include: one or more processors 301, one or more input devices 302, one or more output devices 303 and one or more memories 304. The processors 301, input devices 302, output devices 303 and memories 304 communicate with each other via a communication bus 305. The memory 304 is used to store computer programs, and the computer programs include program instructions. The processor 301 is used to execute the program instructions stored in the memory 304. The processor 301 is configured to call the program instructions to execute the functions of each module / unit in the above-mentioned device embodiments, such as Figure 2 The functions of modules 21 to 23 are shown.

[0141] It should be understood that in the embodiment of the present disclosure, the processor 301 may be a central processing unit (CPU), and the processor may also be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0142] The input device 302 may include a touch panel, a fingerprint collection sensor (for collecting the user's fingerprint information and fingerprint direction information), a microphone, etc., and the output device 303 may include a display (LCD, etc.), a speaker, etc.

[0143] The memory 304 may include a read-only memory and a random access memory, and provide instructions and data to the processor 301. A portion of the memory 304 may also include a non-volatile random access memory. For example, the memory 304 may also store information about the device type.

[0144] In a specific implementation, the processor 301, input device 302, and output device 303 described in the embodiments of the present disclosure can execute the implementation methods described in the first and second embodiments of the battery pack pressure intelligent control method provided in the embodiments of the present disclosure, and can also execute the implementation methods of the battery pack pressure intelligent control system described in the embodiments of the present disclosure, which will not be repeated here.

[0145] In another embodiment of the present disclosure, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores a computer program, wherein the computer program includes program instructions, and when the program instructions are executed by the processor, all or part of the processes in the above-mentioned embodiment method are implemented, and the computer program can also be completed by instructing the relevant hardware through the computer program. The computer program can be stored in a computer-readable storage medium, and when the computer program is executed by the processor, the steps of each of the above-mentioned method embodiments can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form, etc. The computer-readable medium can include: any entity or device capable of carrying computer program code, recording medium, U disk, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium, etc.

[0146] The computer-readable storage medium may be an internal storage unit of the battery pack pressure intelligent control system of any of the aforementioned embodiments, such as a hard disk or memory of the battery pack pressure intelligent control system. The computer-readable storage medium may also be an external storage device of the battery pack pressure intelligent control system, such as a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), etc. equipped on the battery pack pressure intelligent control system. Furthermore, the computer-readable storage medium may also include both an internal storage unit of the battery pack pressure intelligent control system and an external storage device. The computer-readable storage medium is used to store computer programs and other programs and data required by the battery pack pressure intelligent control system. The computer-readable storage medium may also be used to temporarily store data that has been output or is to be output.

[0147] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in terms of function in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this disclosure.

[0148] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the battery pack pressure intelligent control system and unit described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0149] In the several embodiments provided in the present application, it should be understood that the disclosed battery pack pressure intelligent control system and method can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces or units, or it can be an electrical, mechanical or other form of connection.

[0150] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the embodiments of the present disclosure.

[0151] In addition, each functional unit in each embodiment of the present disclosure may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0152] The above are only specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in the present disclosure, and these modifications or replacements should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A battery pack pressure intelligent control method, characterized in that: include: determining a first opening threshold of the explosion-proof valve based on battery characteristics of the battery pack and a temperature of an external environment in which the battery pack is located; The explosion-proof valve is arranged in the battery pack; The step of determining a first opening threshold of the explosion-proof valve based on the battery characteristics of the battery pack and the temperature of the external environment in which the battery pack is located comprises: Determine an initial opening threshold of the explosion-proof valve based on the battery type, battery capacity, charge and discharge rate, and battery aging rate of the battery pack; change the initial opening threshold to a first opening threshold according to the temperature of the environment in which the battery pack is located; Wherein, the initial opening threshold of the explosion-proof valve is determined based on the battery type, battery capacity, charge and discharge rate and battery aging rate of the battery pack, including: Establish the relationship curve between battery capacity and valve opening threshold, the relationship curve between charge and discharge rate and valve opening threshold, and the relationship curve between battery aging rate and valve opening threshold under different battery types; Determine the initial opening threshold of the explosion-proof valve of the battery pack according to the weights of the valve opening threshold corresponding to the three curves, based on the relationship curve between battery capacity and valve opening threshold, the relationship curve between charge and discharge rate and valve opening threshold, and the relationship curve between battery aging rate and valve opening threshold; determine the first opening time when the pressure in the battery pack is equal to the first opening threshold according to the power usage law; the power usage law is the historical power usage data of the external load of the battery pack and the historical charging data of the battery pack; control the opening of the explosion-proof valve according to the first opening time; The step of determining the first start time when the pressure in the battery pack is equal to the first start threshold value according to the power usage rule includes: Determine the relationship between the power parameters of the external load of the battery pack and the pressure in the battery pack based on the power usage law; the power parameters directly reflect the power output of the battery pack; Inputting the external load power parameter monitored in real time into the relationship between the power parameter of the external load and the pressure in the battery pack to obtain a first opening time when the pressure in the battery pack is equal to a first opening threshold; The step of controlling the explosion-proof valve to open according to the first opening time includes: In response to the battery pack being in a charging mode, the explosion-proof valve is controlled to be opened for a first time period in advance based on the first opening time; in response to the battery pack being in a discharging mode, the explosion-proof valve is controlled to be opened for a second time period in advance based on the first opening time; The first duration is greater than the second duration; Wherein, the battery pack includes a first power supply unit and a second power supply unit, and each power supply unit corresponds to an explosion-proof valve; In response to the battery pack being in the charging mode, controlling the explosion-proof valve to open by a first time length in advance based on the first opening time includes: In response to the first power supply unit being in the charging mode and the second power supply unit being in the sleep mode, the first explosion-proof valve corresponding to the first power supply unit is controlled to be opened in advance by a first time length based on the first opening time, and the second explosion-proof valve corresponding to the second power supply unit is controlled to be opened in advance by a third time length; The first duration is greater than the third duration.

2. The battery pack pressure intelligent control method according to claim 1, characterized in that: The determining, based on the power usage rule, the relationship between the power parameter of the external load of the battery pack and the pressure in the battery pack includes: The power usage pattern is input into the neural network model to obtain the relationship between the power parameters of the external load of the battery pack and the pressure inside the battery pack.

3. The battery pack pressure intelligent control method according to claim 1, characterized in that: Also includes: After the explosion-proof valve is opened, the closing time of the valve is determined based on the pressure and temperature in the battery pack.

4. The battery pack pressure intelligent control method according to claim 3, characterized in that: The method of determining the closing time of the valve based on the pressure and temperature in the battery pack includes: When the pressure in the battery pack is less than a first ratio of a first opening threshold and the temperature in the battery pack is less than a first temperature, controlling the explosion-proof valve to close; When the pressure in the battery pack is less than a first proportion of the first opening threshold and the temperature in the battery pack is greater than or equal to the first temperature, the explosion-proof valve is controlled to close after a fourth delay.

5. A battery pack pressure intelligent control device, characterized in that: include: A threshold determination module, configured to determine a first opening threshold of the explosion-proof valve based on battery characteristics of the battery pack and a temperature of an external environment in which the battery pack is located; The explosion-proof valve is arranged in the battery pack; The step of determining a first opening threshold of the explosion-proof valve based on the battery characteristics of the battery pack and the temperature of the external environment in which the battery pack is located comprises: Determine an initial opening threshold of the explosion-proof valve based on the battery type, battery capacity, charge and discharge rate, and battery aging rate of the battery pack; change the initial opening threshold to a first opening threshold according to the temperature of the environment in which the battery pack is located; Wherein, the initial opening threshold of the explosion-proof valve is determined based on the battery type, battery capacity, charge and discharge rate and battery aging rate of the battery pack, including: Establish the relationship curve between battery capacity and valve opening threshold, the relationship curve between charge and discharge rate and valve opening threshold, and the relationship curve between battery aging rate and valve opening threshold under different battery types; According to the relationship curve between battery capacity and valve opening threshold, the relationship curve between charge and discharge rate and valve opening threshold, and the relationship curve between battery aging rate and valve opening threshold, the initial opening threshold of the explosion-proof valve of the battery pack is determined by the weights of the three curves corresponding to the valve opening threshold; A time calculation module, used to determine a first opening time when the pressure in the battery pack is equal to a first opening threshold according to a power usage pattern; the power usage pattern is historical power usage data of an external load of the battery pack and historical charging data of the battery pack; The step of determining the first start time when the pressure in the battery pack is equal to the first start threshold value according to the power usage rule includes: Determine the relationship between the power parameters of the external load of the battery pack and the pressure in the battery pack based on the power usage law; the power parameters directly reflect the power output of the battery pack; Inputting the external load power parameter monitored in real time into the relationship between the power parameter of the external load and the pressure in the battery pack to obtain a first opening time when the pressure in the battery pack is equal to a first opening threshold; A valve opening module, used for controlling the opening of the explosion-proof valve according to the first opening time; The step of controlling the explosion-proof valve to open according to the first opening time includes: In response to the battery pack being in a charging mode, the explosion-proof valve is controlled to be opened for a first time period in advance based on the first opening time; in response to the battery pack being in a discharging mode, the explosion-proof valve is controlled to be opened for a second time period in advance based on the first opening time; The first duration is greater than the second duration; Wherein, the battery pack includes a first power supply unit and a second power supply unit, and each power supply unit corresponds to an explosion-proof valve; In response to the battery pack being in the charging mode, controlling the explosion-proof valve to open by a first time length in advance based on the first opening time includes: In response to the first power supply unit being in the charging mode and the second power supply unit being in the sleep mode, the first explosion-proof valve corresponding to the first power supply unit is controlled to be opened in advance by a first time length based on the first opening time, and the second explosion-proof valve corresponding to the second power supply unit is controlled to be opened in advance by a third time length; The first duration is greater than the third duration.

6. A battery pack pressure intelligent control system, comprising a memory, a processor, and a computer program stored in the memory and running on the processor, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 4 are implemented.

7. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 4 are implemented.

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