CN118983548B - Battery pack pressure intelligent control method, device, system and storage medium - Google Patents
Battery pack pressure intelligent control method, device, system and storage medium Download PDFInfo
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4285—Testing apparatus
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/30—Arrangements for facilitating escape of gases
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/30—Arrangements for facilitating escape of gases
- H01M50/375—Vent means sensitive to or responsive to temperature
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/005—Detection of state of health [SOH]
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Chemical & Material Sciences (AREA)
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- General Health & Medical Sciences (AREA)
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Abstract
本公开提供了一种电池组压力智能控制方法、装置、系统及存储介质，属于电池供电技术领域，该方法包括：基于电池组的电池特性和电池组所处外部环境的温度确定防爆阀的第一开启阈值；防爆阀设置于电池组内；根据用电规律确定电池组内的压力等于第一开启阈值的第一开启时间；用电规律为电池组外接负载的历史用电数据和电池组的历史充电数据；根据第一开启时间控制防爆阀开启。本公开能够有效地管理和调节电池组内部压力，延长电池寿命。
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
The disclosure belongs to the technical field of battery power supply, and more particularly relates to a method, a device, a system and a storage medium for intelligently controlling pressure of a battery pack.
Background
With the continuous development of technologies such as the internet of things and big data, intelligent management has become an important trend of battery pack technology development. For example, in a device using electric energy as a power source, such as a new energy automobile, the battery pack may generate heat during operation, and at the same time, a pressure difference may be generated between the inside and outside of the battery box due to a change in ambient pressure. Such pressure differences may damage the battery box and even cause safety problems such as explosion. Therefore, how to effectively manage and regulate the internal pressure of the battery pack so as to be balanced with the external pressure is an important technical challenge for ensuring the safe operation of the battery pack.
Disclosure of Invention
The present disclosure is directed to a method, apparatus, system, and storage medium for intelligently controlling the pressure of a battery pack to effectively manage and regulate the internal pressure of the battery pack so as to be balanced with the external pressure.
In a first aspect of an embodiment of the present disclosure, there is provided a method for intelligently controlling a pressure of a battery pack, including:
Determining a first opening threshold of an explosion-proof valve based on battery characteristics of a battery pack and the temperature of an external environment where the battery pack is located;
determining a first starting time when the pressure in the battery pack is equal to a first starting threshold value according to an electricity consumption rule, wherein the electricity consumption rule is historical electricity consumption data of an external load of the battery pack and historical charging data of the battery pack;
and controlling the explosion-proof valve to be opened according to the first opening time.
In a second aspect of the embodiments of the present disclosure, there is provided an intelligent control device for pressure of a battery pack, including:
the system comprises a threshold value determining module, a first opening threshold value determining module and a second opening threshold value determining module, wherein the threshold value determining module is used for determining a first opening threshold value of an explosion-proof valve based on battery characteristics of a battery pack and the temperature of an external environment where the battery pack is positioned;
the time calculation module is used for determining a first starting time when the pressure in the battery pack is equal to a first starting threshold according to an electricity consumption rule, wherein the electricity consumption rule is historical electricity consumption data of an external load of the battery pack and historical charging data of the battery pack;
and the valve opening module is used for controlling the explosion-proof valve to be opened according to the first opening time.
In a third aspect of the disclosed embodiments, a battery pack pressure intelligent control system is provided, including a memory, a processor, and a computer program stored in the memory and running on the processor, where the processor implements the steps of the battery pack pressure intelligent control method described above when executing the computer program.
In a fourth aspect of the disclosed embodiments, there is provided a computer readable storage medium storing a computer program which, when executed by a processor, implements the steps of the above-described battery pack pressure intelligent control method.
The intelligent control method, device and system for the pressure of the battery pack and the storage medium have the beneficial effects that:
On the one hand, the first opening threshold value of the explosion-proof valve and the corresponding first opening time are accurately set by comprehensively considering the battery characteristics, the external environment temperature and the electricity utilization rule. The safety potential hazards caused by the fact that the internal pressure of the battery pack is too high can be effectively avoided, and the safety of a battery system is remarkably improved. Meanwhile, the opening of the explosion-proof valve is predicted and controlled in advance, potential damage to the battery pack caused by rapid gas expansion is prevented, the service life of the battery pack is prolonged, and the maintenance cost is reduced.
On the other hand, the method and the device can further analyze the historical electricity consumption data and the historical charging data of the external load of the battery pack, and can more accurately grasp the electricity consumption rule of the battery pack, so that the opening time of the explosion-proof valve is optimized. The accurate control based on big data not only reduces unnecessary energy waste and improves the energy utilization efficiency, but also ensures that the battery pack can stably supply power at key moments, thereby being beneficial to enhancing the use experience of users, and enabling the users to enjoy more safe and convenient energy service without worrying about power interruption or equipment damage caused by the internal pressure problem of the battery pack.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings that are required for the embodiments or the description of the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and other drawings may be obtained according to these drawings without inventive effort for a person of ordinary skill in the art.
Fig. 1 is a schematic flow chart of a method for intelligent control of battery pack pressure according to an embodiment of the disclosure;
fig. 2 is a block diagram of a battery pack pressure intelligent control device according to an embodiment of the present disclosure;
Fig. 3 is a schematic block diagram of a battery pack pressure intelligent control system provided in an embodiment of the present disclosure.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system configurations, techniques, etc. in order to provide a thorough understanding of the disclosed embodiments. However, it will be apparent to one skilled in the art that the present disclosure may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present disclosure with unnecessary detail.
For the purposes of promoting an understanding of the principles and advantages of the disclosure, reference will now be made to the embodiments illustrated in the drawings.
Referring to fig. 1, fig. 1 is a flowchart of a method for intelligent control of battery pack pressure according to an embodiment of the disclosure, where the method includes:
and S101, determining a first opening threshold value of an explosion-proof valve based on the battery characteristics of the battery pack and the temperature of the external environment where the battery pack is positioned, wherein the explosion-proof valve is arranged in the battery pack.
In this embodiment, the battery pack is a system for providing electric energy by combining a plurality of unit cells (such as lithium ion battery, nickel hydrogen battery, etc.) in series, parallel or series-parallel. The battery pack is generally equipped with a protection circuit, a management system (e.g., a battery management system), and safety devices such as thermal management and safety valves.
Battery characteristics refer to the physical and chemical properties of a battery, including the type, capacity, voltage, internal resistance, charge-discharge rate, degree of aging, etc. of the battery. The battery characteristics are used to evaluate the safety performance and potential risk of the battery pack under certain conditions, thereby assisting in determining the opening threshold of the explosion-proof valve.
The external ambient temperature refers to the temperature condition of the environment in which the battery pack is located. This temperature may be affected by a number of factors, such as the season, the geographic location, the operating environment of the device, etc. External ambient temperature is one of the important factors affecting the performance and safety of the battery pack. The high temperature may cause acceleration of chemical reactions inside the battery and increase the risk of thermal runaway, while the low temperature may affect the charge and discharge performance of the battery.
An explosion-proof valve is a safety device which is usually installed inside a battery pack and is used for automatically opening when the internal pressure of the battery pack is abnormally increased (such as gas accumulation caused by overheat, short circuit and the like) and releasing the internal pressure so as to prevent the explosion of the battery pack.
The first opening threshold refers to a trigger point or threshold at which the explosion proof valve begins to operate under certain conditions (e.g., 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 relieve the internal pressure.
Determining a first opening threshold of the explosion proof valve based on a battery characteristic of the battery pack and a temperature of an external environment in which the battery pack is located, comprising:
And changing the initial opening threshold value into a first opening threshold value according to the temperature of the environment where the battery pack is positioned.
In this embodiment, the battery capacities of the 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, so that determining the initial opening threshold of the explosion-proof valve based on the battery type, the battery capacities, the charge and discharge rates, and the battery aging rates of the battery packs includes:
and establishing a mapping relation table of battery characteristics and valve opening threshold values according to the battery type, the battery capacity, the charge and discharge rate and the battery aging rate, and obtaining the initial opening threshold value of the explosion-proof valve of the battery pack according to the mapping relation table.
Or establishing a relation curve between the battery capacity and the valve opening threshold under different battery types, a relation curve between the charge and discharge rate and the valve opening threshold, and a relation curve between the battery aging rate and the valve opening threshold, wherein the initial opening threshold of the explosion-proof valve of the battery pack is determined according to the relation curve between the battery capacity and the valve opening threshold, the relation curve between the charge and discharge rate and the valve opening threshold, the relation curve between the battery aging rate and the valve opening threshold, and the weights of the three curves corresponding to the valve opening threshold.
By way of example, referring to table 1, three common battery types, lithium ion batteries, nickel hydrogen batteries, and lead acid batteries, are assumed. Lithium ion battery:
the battery capacity ranges from 1000mAh to 5000mAh.
The charge-discharge rate range is 0.5C-3C (C is the battery capacity multiplying power).
The battery aging rate ranges from 0% to 30% (0% in the new battery state as the service time increases, and 30% when the battery capacity decreases to 70% of the initial capacity).
Nickel-hydrogen battery:
The battery capacity ranges from 1500mAh to 4000mAh.
The charge and discharge rate range is 0.3C-2C.
The battery aging rate ranges from 0% to 25%.
Lead-acid battery:
the battery capacity ranges from 20Ah to 100Ah.
The charge and discharge rate ranges from 0.1C to 0.5C.
The battery aging rate ranges from 0% to 20%.
The valve opening threshold range of the explosion-proof valve is assumed to be 1atm to 5atm (1 atm is standard atmospheric pressure).
Table 1 mapping table of battery characteristics to valve opening threshold
For example, if the battery type is a lithium ion battery, a battery capacity and valve opening threshold relationship, a charge/discharge rate and valve opening threshold relationship, and a battery aging rate and valve opening threshold relationship are established according to the sample data. And determining weights of the three curves corresponding to the valve opening threshold through expert evaluation and actual experience. The battery capacity curve weight is assumed to be 0.4, the charge/discharge rate curve weight is assumed to be 0.3, and the battery aging rate curve weight is assumed to be 0.3.
For example, for a particular set of lithium ion batteries, the capacity is 3500mAh, the charge-discharge rate is 1.5C, and the aging rate is 15%. From the battery capacity and valve opening threshold relationship curve, it was found that the opening threshold corresponding to 3500mAh was assumed to be 2.3atm. From the charge-discharge rate and valve opening threshold relationship curve, it is found that the opening threshold corresponding to the charge-discharge rate of 1.5C is assumed to be 2.1atm. From the battery aging rate and valve opening threshold relationship curve, it was found that the opening threshold corresponding to 15% of the aging rate was assumed to be 2.0atm. The initial opening threshold value of the battery explosion-proof valve=2.3×0.4+2.1×0.3+2.0×0.3=2.15 atm.
According to the method for determining the first opening threshold value of the explosion-proof valve based on the battery characteristics of the battery pack and the temperature of the external environment where the battery pack is located, explosion risks caused by abnormal conditions such as overheating and overvoltage of the battery can be effectively prevented, the opening time of the explosion-proof valve is accurately controlled, internal pressure and heat are timely released, and safety of the battery pack and the surrounding environment can be protected.
S102, determining a first starting time when the pressure in the battery pack is equal to a first starting threshold according to an electricity consumption rule, wherein the electricity consumption rule is historical electricity consumption data of an external load of the battery pack and historical charging data of the battery pack.
In this embodiment, the pressure in the battery pack refers to a quantitative representation of the internal state of the battery pack, such as the state of health (SOH), the remaining capacity (SOC), or the atmospheric pressure of the battery pack, which may vary with the use of the battery pack and affect the performance thereof.
The first opening threshold is a preset value or condition for determining whether the battery pack reaches a specific state or condition. When a certain parameter of the battery (such as pressure) reaches or exceeds this threshold, a certain operation or response is triggered.
The first on time refers to a point in time when a certain parameter (e.g., pressure) of the battery pack reaches a first on threshold for the first time.
The electricity consumption rule refers to the electricity consumption of the battery pack in different working states, for example, the electricity consumption behavior and characteristics of external loads (such as equipment and systems) of the battery pack when the battery pack is used. It can be derived by analyzing historical electricity usage data, including electricity usage time, electricity usage amount, electricity usage period, and the like. By analyzing the electricity utilization rule, the future electricity utilization requirement can be predicted, the explosion-proof valve is opened in advance, and the safe operation of the battery pack is ensured. The historical electricity consumption data refers to records of the actual electricity consumption, the electricity consumption time, the electricity consumption mode and other data of the external load of the battery pack in the past period of time. The electricity usage law also refers to historical charging data of the battery pack over a period of time.
Determining a first opening time of the pressure in the battery pack equal to a first opening threshold according to an electricity consumption rule, wherein the first opening time comprises the relationship between an electric power parameter of an external load of the battery pack and the pressure in the battery pack based on the electricity consumption rule;
and determining a first opening time when the pressure in the battery pack is equal to a first opening threshold according to the relation between the electric power parameter of the external load of the battery pack and the pressure in the battery pack.
Or determining a first on time for which the pressure within the battery pack is equal to a first on threshold based on the historical power usage, the historical power usage time, the historical power usage pattern, and the historical charging data.
Illustratively, battery pack power usage data for different time periods during the past month is collected. For example, the electricity consumption in kilowatt-hours for four time periods of 0 to 6, 6 to 12, 12 to 18, 18 to 24 points per day is recorded. And the electricity consumption under different electricity consumption scenes is distinguished, such as a normal working state, a high-load running state and the like. The start time and end time of each power use are recorded in detail, to the nearest hour. The primary power usage mode is determined, such as a continuous power usage mode, an intermittent power usage mode, a peak power usage mode, a valley power usage mode, and the like. The initial charge, the final charge, the charge duration and the charge mode (fast charge, slow charge, etc.) of each charge are recorded.
And determining the change of the internal pressure of the battery pack under different power consumption by experiments and data analysis. For example, when the amount of electricity used is large, chemical reactions inside the battery pack are aggravated, possibly resulting in pressure rise. It is assumed that it was found through testing that the pressure could rise by 0.2atm every 10kwh of electricity usage. And analyzing the change rule of the pressure of the battery pack in different electricity utilization time periods. It may be found that some time periods are affected by factors such as ambient temperature, and the like, the pressure change is more pronounced. For example, in the hot afternoon, battery pack pressure may rise faster than in the cool early morning. The effect on the stack pressure was analyzed for different power usage patterns. For example, in the continuous high-load power mode, the internal temperature of the battery pack rises rapidly and the pressure rises rapidly, while in the intermittent power mode, the battery pack has a certain heat dissipation time and the pressure rises relatively slowly. And determining the change condition of the pressure of the battery pack in the charging process according to the historical charging data. For example, the high current may cause the internal temperature and pressure of the battery to rise faster during fast charge and the pressure to rise relatively more gradually during slow charge.
The first turn-on threshold is determined to be 1.5atm. Firstly, according to the current electricity consumption situation, the historical data are combined for analysis. For example, in a continuous high load power mode, and with a large power consumption, the pressure rise rate is high in this case according to the history data. It is assumed that the pressure may rise by 0.1atm per hour. Then, an initial pressure of the current battery pack is determined. Let the current pressure be 1atm. The time required for the pressure to rise from the current value to the first opening threshold is calculated. The time required for calculation was (1.5 atm-1 atm)/(0.1 atm/hour=5 hours) based on the pressure rising rate. In practical application, the historical data can be updated continuously, and the relation model is optimized, so that the accuracy of the first opening time prediction is improved.
And S103, controlling the explosion-proof valve to be opened according to the first opening time.
In this embodiment, the processor may be configured to monitor time conditions, system status, and issue control signals. The first on time may be set by a timer, a clock module. The explosion-proof valve can be used as an executing mechanism to receive a control signal sent by the processor and control the opening or closing of the valve according to the control signal.
When the battery pack is in different working modes, the explosion-proof valve can be controlled to be opened in advance based on the first opening time, so that the gas in the battery pack is prevented from expanding rapidly to damage the battery due to the fact that the explosion-proof valve is opened in time.
For example, the battery pack has different operation modes, such as a normal charge mode, a discharge mode, and an idle mode. It is assumed that the first on time, in which the pressure in the battery pack is equal to the first on threshold, is 30 minutes in the current operation mode, calculated according to the historical power consumption, the power consumption time, the power consumption mode, and the like. The processor starts counting down through a timer or a clock module, and monitors the remaining time in real time.
If the battery pack is in a charging mode, according to the current electricity utilization rule, when the explosion-proof valve is opened at the first opening time, the pressure value in the battery pack is relatively large, and the pressure value is difficult to reduce in a short time. Therefore, in order to reduce the pressure in the battery pack more easily and prolong the service life of the battery, the explosion-proof valve can be opened 10 minutes in advance.
If the battery pack is in the discharge mode, when the battery is discharged to 30% or less of the full voltage, the internal temperature of the battery increases and the pressure increases as the discharge time increases. According to the current electricity utilization rule, when the explosion-proof valve is opened at the first opening time, the pressure value in the battery pack is relatively large, and the pressure value is difficult to reduce in a short time. Therefore, in order to reduce the pressure in the battery pack more easily and prolong the service life of the battery, the explosion-proof valve can be opened 5 minutes in advance.
As can be seen from the above, on the one hand, in this embodiment, by comprehensively considering the battery characteristics, the external environment temperature and the electricity consumption rule, the first opening threshold value of the explosion-proof valve and the corresponding first opening time thereof are accurately set. The safety potential hazards caused by the fact that the internal pressure of the battery pack is too high can be effectively avoided, and the safety of a battery system is remarkably improved. Meanwhile, the opening of the explosion-proof valve is predicted and controlled in advance, potential damage to the battery pack caused by rapid gas expansion is prevented, the service life of the battery pack is prolonged, and the maintenance cost is reduced.
On the other hand, the embodiment deeply analyzes the historical electricity consumption data and the historical charging data of the external load of the battery pack, and can more accurately grasp the electricity consumption rule of the battery pack, so that the opening time of the explosion-proof valve is optimized. The accurate control based on big data not only reduces unnecessary energy waste and improves the energy utilization efficiency, but also ensures that the battery pack can stably supply power at key moments, thereby being beneficial to enhancing the use experience of users, and enabling the users to enjoy more safe and convenient energy service without worrying about power interruption or equipment damage caused by the internal pressure problem of the battery pack.
In one embodiment of the present disclosure, determining a first on time for which a pressure within a battery pack is equal to a first on threshold according to a power usage law includes:
determining the relation between the electric power parameter of the external load of the battery pack and the pressure in the battery pack based on the electricity utilization rule;
and determining a first opening time when the pressure in the battery pack is equal to a first opening threshold according to the relation between the electric power parameter of the external load of the battery pack and the pressure in the battery pack.
In this embodiment, the electricity consumption rule refers to the power consumption or generation mode of the battery pack in different working states (such as charging, discharging, standby, etc.). These modes are affected by a variety of factors, such as load type, load size, operating time, ambient temperature, etc. The power parameters mainly comprise current, voltage, power and the like, and the parameters directly reflect the power condition of the battery pack output to the outside.
The present embodiment can analyze the correlation between the power parameter data and the internal pressure data of the battery pack using a statistical method. For example, first, by calculating the correlation coefficient, drawing the scatter diagram, etc., it is preliminarily determined whether there is a significant linear or nonlinear relationship between them. Next, based on the results of the correlation analysis, an appropriate mathematical model is selected to describe the relationship between the internal pressure and the electrical parameters of the external load of the battery pack. The model may be a formula derivation based on physical principles, or may be an empirical formula obtained by data fitting. And finally, verifying the model, namely verifying the established model by using new experimental data or actual operation data. And evaluating the accuracy and reliability of the model by comparing the difference between the model prediction result and the actual measurement result.
The method can also directly input the electricity consumption rule into the neural network model to obtain the relation between the electric power parameter of the external load of the battery pack and the pressure in the battery pack, and can efficiently predict the relation between the electric power parameter of the external load of the battery pack and the internal pressure by directly inputting the electricity consumption rule into the neural network model, so that the prediction precision and the instantaneity are remarkably improved, powerful technical support is provided for the safety monitoring and the performance optimization of the battery pack, and the stable operation and the safety of a battery system are ensured. And inputting the external load power parameters monitored in real time into a relation model such as a mathematical model or a neural network model which is built before, and predicting the pressure change trend in the battery pack under the current load power parameters by using the model. And judging when the pressure in the battery pack reaches a set first opening threshold according to the prediction result, wherein the time point is the first opening time. When the pressure in the battery pack is predicted to reach the first opening threshold, an early warning signal can be sent out in time, and necessary intervention measures such as adjusting an external load, reducing the charge and discharge rate or starting a cooling system are adopted to control the pressure rising speed in the battery pack. If the pressure in the battery pack continues to rise and exceeds the safety range, the explosion-proof valve may be opened to vent the gas generated in the battery pack.
It can be derived from the above that, in this embodiment, by accurately analyzing the electricity usage rule, a dynamic relationship model between the external load power parameter and the internal pressure of the battery pack is established, so that the time point (the first opening time) when the pressure in the battery pack reaches the first opening threshold can be accurately predicted and determined. The method not only improves the intelligent level of the safety management of the battery pack, 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 the maintenance cost and improves the overall energy efficiency.
In one embodiment of the present disclosure, determining a relationship between a power parameter of an external load of a battery pack and a pressure within the battery pack based on a power usage law includes:
And inputting the electricity utilization rule into the neural network model to obtain the relation between the electric power parameter of the external load of the battery pack and the pressure in the battery pack.
In the embodiment, external load power parameter data of the battery pack under different electricity utilization rules, including voltage, current, power and the like, are collected, and meanwhile, pressure data of the battery pack at corresponding time points are recorded. And cleaning the collected data, removing noise and abnormal values and normalizing the data so that the neural network model can be better processed.
The neural network model is selected according to the characteristics of the data, and a Multi-Layer Perceptron (MLP), a convolutional neural network (Convolutional Neural Network, CNN), a cyclic neural network (Recurrent Neural Networks, RNN) or the like can be used. After the neural network model is determined, parameters such as the layer number of the neural network, the number of nodes at each layer, an activation function and the like can be further determined. Appropriate optimization algorithms and loss functions are selected to adjust model parameters during training to minimize prediction errors. The historical electricity utilization rule data are divided into a training set, a verification set and a test set, and the neural network model is trained according to the three data sets.
Through the steps, when the electricity utilization rule of the current period is input into the trained neural network model, the relation between the electric power parameter of the external load of the battery pack and the pressure in the battery pack can be obtained, and then the first opening time of the pressure in the battery pack equal to the first opening threshold value can be determined.
It can be obtained from the above that, in this embodiment, by using the neural network model to process the electricity consumption rule, the relationship between the external load power parameter and the internal pressure of the battery pack is accurately established, so as to implement intelligent prediction and control, improve the running safety and efficiency of the battery pack, and reduce the fault risk caused by pressure abnormality.
In one embodiment of the present disclosure, controlling the opening of the explosion proof valve according to a first opening time includes:
in response to the battery pack being in a charging mode, controlling the explosion-proof valve to be opened in advance for a first time period on the basis of the first opening time;
In response to the battery pack being in a discharging mode, controlling the explosion-proof valve to be opened in advance for a second duration on the basis of the first opening time;
The first time period is longer than the second time period.
In this embodiment, the early opening times of the explosion-proof valve are different in different operation modes (charge mode and discharge mode) of the battery pack, 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 rate and degree of change in the internal pressure of the battery pack.
During the charging process, the electrolyte is decomposed, gas is generated (such as hydrogen, oxygen, etc.) and the electrode material is expanded. These processes are typically more severe than discharge, resulting in a rapid rise in the internal pressure of the battery. Therefore, in order to timely release the excessive pressure, prevent the battery from being damaged or even exploded, the system needs to control the explosion-proof valve to be opened in advance for a relatively long first time period on the basis of the first opening time to ensure safety.
Compared with the charging process, the reaction generated in the battery during discharging is mild, and the generated gas amount and pressure change are small. Although there is still an increase in pressure due to a temperature rise or the like during the discharge, the rate and magnitude of the pressure rise as a whole is lower than that during the charge. Therefore, in the discharging mode, the system can control the explosion-proof valve to be opened in advance for a relatively short second time, so that safety can be ensured, and energy loss and efficiency reduction caused by excessively opening the explosion-proof valve can be avoided.
According to the method, the actual pressure change condition inside the battery pack can be better matched by adjusting the early opening time of the explosion-proof valve according to different working modes, so that more accurate pressure control is realized, and the safety and the operation efficiency of the battery pack are improved.
In one embodiment of the present disclosure, a battery pack includes a first power supply unit and a second power supply unit, each of which corresponds to one explosion-proof valve;
In response to the battery pack being in a charging mode, controlling the opening of the explosion-proof valve in advance for a first period of time based on the first opening time, comprising:
responding to the first power supply unit in a charging mode, the second power supply unit in a dormant mode, controlling the opening of a first explosion-proof valve corresponding to the first power supply unit in advance for a first time period on the basis of the first opening time period, and controlling the opening of a second explosion-proof valve corresponding to the second power supply unit in advance for a third time period;
the first time period is longer than the third time period.
In this embodiment, the battery pack includes a first power supply unit and a second power supply unit, and when the power demand is not high, the two power supply units can supply power in turn, so as to save energy and prolong the service life of the battery.
When the battery pack is in a power supply mode, the first power supply unit can be selected to supply power, the second power supply unit can be selected to sleep, and the first power supply unit can also be selected to sleep, and the second power supply unit can be selected to supply power. The first power supply unit is assumed to be in a charging mode, and the second power supply unit is in a sleep mode, in which case the first power supply unit generates a higher internal pressure during charging, and thus needs 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 positioned in the same battery pack, when the temperature of the first power supply unit rises, the second power supply unit is affected, and therefore the corresponding second explosion-proof valve also needs to be opened in advance. Meanwhile, the second power supply unit is in the sleep mode, and the internal pressure change is small, so that the corresponding second explosion-proof valve only needs to be opened in advance for a third time period (less than the second time period).
It can be derived from the above that in this embodiment, by opening the explosion-proof valve in advance, the system can more effectively manage the pressure generated in the charging process of the battery pack, thereby reducing the safety risk caused by the excessively high internal pressure. Meanwhile, the explosion-proof valve is opened in advance for the dormant power supply unit, so that unnecessary energy loss is reduced, and the service life of the battery is prolonged.
In response to the battery pack being in the charging mode, controlling the opening of the explosion-proof valve in advance for a first time period based on the first opening time, further comprising:
And in response to the battery pack being in the charging mode, determining to control the opening of the explosion-proof valve in advance for a first time period on the basis of the first opening time according to the working modes of the first power supply unit and the second power supply unit and the power supply voltages of the first power supply unit and the second power supply unit.
If the power supply voltage of the first power supply unit is larger than that of the second power supply unit, the first power supply unit and the second power supply unit are both in a charging mode, and on the basis of the first opening time, the first explosion-proof valve corresponding to the first power supply unit is controlled to be opened in advance by a fifth time period respectively according to the voltage ratio of the first power supply voltage to the second power supply voltage, and the second explosion-proof valve corresponding to the second power supply unit is controlled to be opened in advance by a sixth time period. The fifth time period is longer than the sixth time period.
If the power supply voltage of the first power supply unit is larger than that of the second power supply unit, the first power supply unit is in a power supply mode, the second power supply unit is in a sleep mode, the first explosion-proof valve corresponding to the first power supply unit is controlled to be opened in advance for a seventh time period on the basis of the first opening time, and the second explosion-proof valve corresponding to the second power supply unit is controlled to be opened in advance for an eighth time period. The seventh time period is longer than the eighth time period.
If the power supply voltage of the first power supply unit is larger than that of the second power supply unit, the first power supply unit is in a dormant mode, and the second power supply unit is in a charging mode, the first explosion-proof valve corresponding to the first power supply unit is controlled to be opened in advance for a ninth time period on the basis of the first opening time, and the second explosion-proof valve corresponding to the second power supply unit is controlled to be opened in advance for a tenth time period. And calculating a ninth duration and a tenth duration according to the voltage ratio of the first power supply voltage to the second power supply voltage and the corresponding preset durations in different modes.
It can be obtained from the above that, in this embodiment, by comprehensively considering the voltage and the working mode of the power supply unit, the early opening time of the explosion-proof valve is accurately adjusted, so that the internal pressure change of the battery pack under different working conditions is effectively dealt with, thereby ensuring the safety and optimizing the efficiency. Particularly, the advanced time length is flexibly calculated according to the voltage ratio and the preset time length, so that a finer pressure management strategy is realized, and the overall stability and reliability of the battery pack are improved.
In one embodiment of the present disclosure, the battery pack pressure intelligent control method further includes:
after the explosion-proof valve is opened, the closing time of the valve is determined based on the pressure and the temperature in the battery pack.
In this embodiment, the explosion-proof valve may 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. Pressure and temperature data in the battery pack can be acquired in real time through a pressure sensor and a temperature sensor arranged in the battery pack. When the system determines that the pressure has fallen within the safe range and the temperature is also at an appropriate level, then it may be considered to close the explosion proof valve.
From the above, by monitoring the pressure and temperature in the battery in real time and closing the explosion-proof valve when appropriate, the internal pressure of the battery is prevented from being too low or the temperature is prevented from being abnormally lowered, thereby protecting the battery from potential damage. This dynamic adjustment mechanism ensures the safety of the battery pack during charging or operation.
Accurate control of the shut down time helps to reduce unnecessary energy loss and gas emissions, thereby optimizing the overall performance of the battery. Excessive opening of the explosion-proof valve may result in energy waste and reduced efficiency of the battery pack, while timely closing may maintain the battery pack in an optimal operating state.
The intelligent control method for the pressure of the battery pack can adapt to the changes of the internal pressure and the temperature of the battery pack under different working conditions, and can ensure that the battery pack can keep the optimal performance and the safe state under various use scenes through real-time analysis and dynamic adjustment. The enhanced adaptability enables the method to have wider application prospects in the fields of electric automobiles, energy storage systems and the like.
In one embodiment of the present disclosure, determining a closing time of a valve based on a pressure and a temperature within a battery pack includes:
When the pressure in the battery pack is smaller than the first proportion of the first opening threshold value and the temperature in the battery pack is smaller than the first temperature, the explosion-proof valve is controlled to be closed;
And when the pressure in the battery pack is smaller than the first proportion of the first opening threshold value and the temperature in the battery pack is larger than or equal to the first temperature, the explosion-proof valve is controlled to be closed after the fourth time period.
In this embodiment, the explosion-proof valve is controlled 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 less than the first temperature. In this case, the pressure in the battery pack has been significantly reduced and falls below a certain proportion of the first opening threshold (this proportion is preset for determining whether the pressure has recovered to the safety level). At the same time, the temperature in the battery pack is also below the set first temperature threshold, which indicates that the battery pack is not only pressure effectively controlled, but also within a safe range. The system therefore decides that the explosion valve can be safely closed at this time to avoid unnecessary energy loss and potential risks.
And when the pressure in the battery pack is smaller than the first proportion of the first opening threshold value and the temperature in the battery pack is larger than or equal to the first temperature, the explosion-proof valve is controlled to be closed after 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 is that the temperature in the battery pack is high, and the set first temperature threshold is reached or exceeded. This may be due to insufficient dissipation of heat generated from the battery pack during charge or discharge, or high ambient temperature. In this case, if the explosion-proof valve is closed immediately, a safety risk may be raised because the temperature continues to rise. Thus, the system may delay the fourth time period (which is preset to wait for the temperature to drop to a safe level) before closing the explosion proof valve. Thus, the stability of the internal pressure of the battery pack can be ensured, and the potential hazard caused by the overhigh temperature can be avoided.
From the above, it can be seen that this embodiment improves the accuracy of the safety control of the battery pack, avoiding the risk that might be brought about by closing the explosion proof valve too early or too late. Meanwhile, the closing time is flexibly adjusted according to the temperature condition, so that the stability of the internal pressure of the battery pack is ensured, and the influence of temperature abnormality on the battery pack is prevented, thereby improving the overall performance and safety of the battery pack.
Corresponding to the battery pack pressure intelligent control method of the above embodiment, fig. 2 is a block diagram of a battery pack pressure intelligent control device according to an embodiment of the present disclosure. For ease of illustration, only portions relevant to embodiments of the present disclosure are shown. Referring to fig. 2, the battery pack pressure intelligent control device 20 includes a threshold determination module 21, a time calculation module 22, and a valve opening module 23.
The threshold determining module 21 is configured to determine a first opening threshold of the explosion-proof valve based on a battery characteristic of the battery pack and a temperature of an external environment where the battery pack is located;
The time calculation module 22 is configured to determine a first on time when the pressure in the battery pack is equal to a first on threshold according to an electricity consumption rule, where the electricity consumption rule is historical electricity consumption data of an external load of the battery pack and historical charging data of the battery pack;
A valve opening module 23 for controlling the opening of the explosion proof valve according to the first opening time.
In one embodiment of the present disclosure, the time calculation module 22 is specifically configured to:
determining the relation between the electric power parameter of the external load of the battery pack and the pressure in the battery pack based on the electricity utilization rule;
and determining a first opening time when the pressure in the battery pack is equal to a first opening threshold according to the relation between the electric power parameter of the external load of the battery pack and the pressure in the battery pack.
In one embodiment of the present disclosure, the time calculation module 22 is specifically configured to:
And inputting the electricity utilization rule into the neural network model to obtain the relation between the electric power parameter of the external load of the battery pack and the pressure in the battery pack.
In one embodiment of the present disclosure, the valve opening module 23 is specifically configured to:
in response to the battery pack being in a charging mode, controlling the explosion-proof valve to be opened in advance for a first time period on the basis of the first opening time;
In response to the battery pack being in a discharging mode, controlling the explosion-proof valve to be opened in advance for a second duration on the basis of the first opening time;
the first time period is longer than the second time period. In one embodiment of the present disclosure,
In one embodiment of the present disclosure, a battery pack includes a first power supply unit and a second power supply unit, each of which corresponds to one explosion-proof valve;
The valve opening module 23 is specifically configured to:
responding to the first power supply unit in a charging mode, the second power supply unit in a dormant mode, controlling the opening of a first explosion-proof valve corresponding to the first power supply unit in advance for a first time period on the basis of the first opening time period, and controlling the opening of a second explosion-proof valve corresponding to the second power supply unit in advance for a third time period;
the first time period is longer than the third time period.
In one embodiment of the present disclosure, the valve opening module 23 is further configured to:
after the explosion-proof valve is opened, the closing time of the valve is determined based on the pressure and the temperature in the battery pack.
In one embodiment of the present disclosure, the valve opening module 23 is specifically further configured to:
When the pressure in the battery pack is smaller than the first proportion of the first opening threshold value and the temperature in the battery pack is smaller than the first temperature, the explosion-proof valve is controlled to be closed;
And when the pressure in the battery pack is smaller than the first proportion of the first opening threshold value and the temperature in the battery pack is larger than or equal to the first temperature, the explosion-proof valve is controlled to be closed after the fourth time period.
Referring to fig. 3, fig. 3 is a schematic block diagram of a battery pack pressure intelligent control system according to an embodiment of the present disclosure. The battery pack pressure intelligent control system 300 in this embodiment as shown in fig. 3 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 processor 301, the input device 302, the output device 303, and the memory 304 communicate with each other via a communication bus 305. The memory 304 is used to store a computer program comprising program instructions. The processor 301 is configured to execute program instructions stored in the memory 304. Wherein the processor 301 is configured to invoke program instructions to perform the functions of the modules/units of the various device embodiments described above, such as the functions of the modules 21-23 shown in fig. 2.
It should be appreciated that in the disclosed embodiments, the Processor 301 may be a central processing unit (Central Processing Unit, CPU), which may also be other general purpose processors, digital signal processors (DIGITAL SIGNAL processors, DSPs), application SPECIFIC INTEGRATED Circuits (ASICs), off-the-shelf Programmable gate arrays (Field-Programmable GATE ARRAY, 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 be any conventional processor or the like.
The input device 302 may include a touch pad, a fingerprint collection sensor (for collecting fingerprint information of a user and direction information of a fingerprint), a microphone, etc., and the output device 303 may include a display (LCD, etc.), a speaker, etc.
The memory 304 may include read only memory and random access memory and provides instructions and data to the processor 301. A portion of memory 304 may also include non-volatile random access memory. For example, the memory 304 may also store information of device type.
In a specific implementation, the processor 301, the input device 302, and the output device 303 described in the embodiments of the present disclosure may perform the implementation manners described in the first embodiment and the second embodiment of the method for controlling the pressure of the battery pack provided in the embodiments of the present disclosure, and may also perform the implementation manner of the intelligent control system for the pressure of the battery pack described in the embodiments of the present disclosure, which is not described herein again.
In another embodiment of the disclosure, a computer readable storage medium is provided, where the computer readable storage medium stores a computer program, where the computer program includes program instructions, where the program instructions, when executed by a processor, implement all or part of the procedures in the method embodiments described above, or may be implemented by instructing related hardware by the computer program, where the computer program may be stored in a computer readable storage medium, where the computer program, when executed by the processor, implements the steps of each of the method embodiments described above. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, executable files or in some intermediate form, etc. The computer readable medium may include any entity or device capable of carrying computer program code, recording medium, USB flash disk, removable hard disk, magnetic disk, optical disk, computer Memory, read-Only Memory (ROM), random access Memory (RAM, random Access Memory), electrical carrier signals, telecommunications signals, and software distribution media, among others.
The computer readable storage medium may be a memory unit of the battery pack pressure intelligent control system of any of the foregoing embodiments, such as a hard disk or a 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 (SD) card, a flash memory card (FLASH CARD), etc. that are provided on the battery pack pressure intelligent control system. Further, the computer readable storage medium may also include both an internal memory unit and an external memory device of the battery pack pressure intelligent control system. The computer readable storage medium is used for storing computer programs and other programs and data required by the intelligent control system of the battery pack pressure. The computer-readable storage medium may also be used to temporarily store data that has been output or is to be output.
Those of ordinary skill in the art will appreciate that the elements and algorithm steps described in connection with the embodiments disclosed herein may be embodied in electronic hardware, in computer software, or in a combination of the two, and that the elements and steps of the examples have been generally described in terms of function in the foregoing description to clearly illustrate the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present disclosure.
It will be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working process of the above-described battery pack pressure intelligent control system and unit may refer to the corresponding process in the foregoing method embodiment, and will not be described herein again.
In several embodiments provided herein, it should be understood that the disclosed battery pack pressure intelligent control system and method may be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of elements is merely a logical functional division, and there may be additional divisions of actual implementation, e.g., multiple elements or components may be combined or integrated into another system, or some features may be omitted, or not performed. In addition, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection via some interfaces or units, or may be an electrical, mechanical, or other form of connection.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purposes of the embodiments of the present disclosure.
In addition, each functional unit in each embodiment of the present disclosure may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The foregoing is merely a specific embodiment of the present disclosure, but the protection scope of the present disclosure is not limited thereto, and any equivalent modifications or substitutions will be apparent to those skilled in the art within the scope of the present disclosure, and these modifications or substitutions should be covered in the scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.
Claims (7)
1. An intelligent control method for the pressure of a battery pack is characterized by comprising the following steps:
Determining a first opening threshold of an explosion-proof valve based on battery characteristics of a battery pack and the temperature of an external environment where the battery pack is located;
The first opening threshold of the explosion-proof valve is determined based on the battery characteristics of the battery pack and the temperature of the external environment where the battery pack is located, and the method comprises the following steps:
Determining an initial opening threshold of the explosion-proof valve based on the battery type, the battery capacity, the charge-discharge rate and the battery aging rate of the battery pack, and changing the initial opening threshold into a first opening threshold according to the temperature of the environment where the battery pack is positioned;
wherein, the initial opening threshold of the explosion-proof valve is determined based on the battery type, the battery capacity, the charge-discharge rate and the battery aging rate of the battery pack, and the method comprises the following steps:
establishing a relation curve between battery capacity and valve opening threshold under different battery types, a relation curve between charge and discharge rate and valve opening threshold, and a relation curve between battery aging rate and valve opening threshold;
Determining an initial opening threshold value of an explosion-proof valve of a battery pack according to a relation curve of battery capacity and valve opening threshold value, a relation curve of charge and discharge rate and valve opening threshold value, a relation curve of battery aging rate and valve opening threshold value, and weights of three curves corresponding to valve opening threshold values;
the determining, according to the electricity consumption rule, a first opening time for the pressure in the battery pack to be equal to a first opening threshold value includes:
determining the relation between the power parameter of the external load of the battery pack and the pressure in the battery pack based on the electricity utilization rule, wherein the power parameter directly reflects the power condition of the external output of the battery pack;
Inputting the real-time monitored external load power parameter into the relation between the external load power parameter 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 value;
The controlling the opening of the explosion-proof valve according to the first opening time includes:
The explosion-proof valve is controlled to be opened in advance for a first time period on the basis of a first opening time in response to the battery pack being in a charging mode;
the first time period is longer than the second time period;
the battery pack comprises a first power supply unit and a second power supply unit, and each power supply unit corresponds to one explosion-proof valve;
the method for controlling the explosion-proof valve to be opened in advance by a first time period on the basis of a first opening time in response to the battery pack being in a charging mode comprises the following steps:
Responding to the first power supply unit in a charging mode, and the second power supply unit in a dormant mode, controlling the first explosion-proof valve corresponding to the first power supply unit to be opened in advance for a first time period on the basis of a first opening time period, and controlling the second explosion-proof valve corresponding to the second power supply unit to be opened in advance for a third time period;
the first time period is longer than the third time period.
2. The method for intelligently controlling the pressure of the battery pack according to claim 1, wherein the 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 electricity consumption rule comprises:
And inputting the electricity utilization rule into a neural network model to obtain the relation between the electric power parameter of the external load of the battery pack and the pressure in the battery pack.
3. The battery pack pressure intelligent control method according to claim 1, further comprising:
after the explosion-proof valve is opened, the closing time of the valve is determined based on the pressure and the temperature in the battery pack.
4. The intelligent control method for battery pressure according to claim 3, wherein the determining the closing time of the valve based on the pressure and the temperature in the battery comprises:
When the pressure in the battery pack is smaller than a first proportion of a first opening threshold value, and the temperature in the battery pack is smaller than a first temperature, the explosion-proof valve is controlled to be closed;
And when the pressure in the battery pack is smaller than a first proportion of a first opening threshold value, and the temperature in the battery pack is larger than or equal to the first temperature, controlling the explosion-proof valve to be closed after a fourth time delay.
5. An intelligent control device for pressure of a battery pack, which is characterized by comprising:
the system comprises a threshold value determining module, a first opening threshold value determining module and a second opening threshold value determining module, wherein the threshold value determining module is used for determining a first opening threshold value of an explosion-proof valve based on battery characteristics of a battery pack and the temperature of an external environment where the battery pack is positioned;
The first opening threshold of the explosion-proof valve is determined based on the battery characteristics of the battery pack and the temperature of the external environment where the battery pack is located, and the method comprises the following steps:
Determining an initial opening threshold of the explosion-proof valve based on the battery type, the battery capacity, the charge-discharge rate and the battery aging rate of the battery pack, and changing the initial opening threshold into a first opening threshold according to the temperature of the environment where the battery pack is positioned;
wherein, the initial opening threshold of the explosion-proof valve is determined based on the battery type, the battery capacity, the charge-discharge rate and the battery aging rate of the battery pack, and the method comprises the following steps:
establishing a relation curve between battery capacity and valve opening threshold under different battery types, a relation curve between charge and discharge rate and valve opening threshold, and a relation curve between battery aging rate and valve opening threshold;
Determining an initial opening threshold value of an explosion-proof valve of the battery pack according to a relation curve of battery capacity and valve opening threshold value, a relation curve of charge and discharge rate and valve opening threshold value, a relation curve of battery aging rate and valve opening threshold value and weights of three curves corresponding to the valve opening threshold value;
the time calculation module is used for determining a first starting time when the pressure in the battery pack is equal to a first starting threshold according to an electricity consumption rule, wherein the electricity consumption rule is historical electricity consumption data of an external load of the battery pack and historical charging data of the battery pack;
the determining, according to the electricity consumption rule, a first opening time for the pressure in the battery pack to be equal to a first opening threshold value includes:
determining the relation between the power parameter of the external load of the battery pack and the pressure in the battery pack based on the electricity utilization rule, wherein the power parameter directly reflects the power condition of the external output of the battery pack;
Inputting the real-time monitored external load power parameter into the relation between the external load power parameter 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 value;
The valve opening module is used for controlling the explosion-proof valve to be opened according to the first opening time;
The controlling the opening of the explosion-proof valve according to the first opening time includes:
The explosion-proof valve is controlled to be opened in advance for a first time period on the basis of a first opening time in response to the battery pack being in a charging mode;
the first time period is longer than the second time period;
the battery pack comprises a first power supply unit and a second power supply unit, and each power supply unit corresponds to one explosion-proof valve;
the method for controlling the explosion-proof valve to be opened in advance by a first time period on the basis of a first opening time in response to the battery pack being in a charging mode comprises the following steps:
Responding to the first power supply unit in a charging mode, and the second power supply unit in a dormant mode, controlling the first explosion-proof valve corresponding to the first power supply unit to be opened in advance for a first time period on the basis of a first opening time period, and controlling the second explosion-proof valve corresponding to the second power supply unit to be opened in advance for a third time period;
the first time period is longer than the third time period.
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, wherein the processor implements the steps of the method of any of claims 1 to 4 when the computer program is executed.
7. A computer readable storage medium storing a computer program, characterized in that the computer program when executed by a processor implements the steps of the method according to any one of claims 1 to 4.
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