Simulation and optimization method and device for battery thermal management system

Abstract

The invention relates to a simulation and optimization method and device for a battery thermal management system, and belongs to the technical field of battery simulation. The method comprises the following steps: constructing a battery thermal simulation model based on physical characteristics of a battery; establishing a heat conduction model and a heat balance equation of the battery, substituting the heat conduction model and the heat balance equation into the battery thermal simulation model, and simulating temperature distribution of the battery under different working conditions by using a numerical solution method to obtain a simulation result; optimizing the design scheme of the battery thermal management system based on the simulation result; verifying the optimized battery thermal management system based on an actual test environment to obtain a verification result so as to determine whether a design scheme of the optimized battery thermal management system is modified or not, and performing thermal management on the battery based on the optimized battery thermal management system under the condition of determining that the design scheme is not modified; the stability and safety of the battery system under the extreme temperature condition can be effectively improved, the service life of the battery is prolonged, and the energy utilization efficiency of the battery is improved.

Description

Technical Field

[0001] The present application relates to a simulation and optimization method and device for a battery thermal management system, and belongs to the technical field of battery simulation. Background Art

[0002] With the widespread application of electric vehicles, wearable devices and other battery-driven devices, the importance of battery thermal management systems has become increasingly prominent. Battery thermal management refers to a series of technologies and methods for temperature control of battery systems to ensure that the battery operates within the optimal temperature range, thereby improving battery performance, life and safety.

[0003] During the charging and discharging process of the battery, a large amount of heat will be generated. If it cannot be effectively controlled and managed, it will easily cause the battery to overheat, thereby reducing its performance and shortening its service life, and even causing safety problems. Therefore, it is important to accurately simulate and optimize the thermal performance of the battery through the battery thermal management system. Based on this, a simulation and optimization method of the battery thermal management system is urgently needed to improve the simulation performance of the battery thermal management system on the battery. Summary of the invention

[0004] This application provides a simulation and optimization method and device for a battery thermal management system. By simulating the temperature changes of the battery under working conditions, the system is designed and optimized to ensure the stability and safety of the battery under extreme temperature conditions. This method can effectively reduce the performance degradation or safety hazards caused by battery overheating, and improve the efficiency and life of the battery under various environmental conditions. This application provides the following technical solutions:

[0005] In a first aspect, a simulation and optimization method for a battery thermal management system is provided, the method comprising:

[0006] Build a battery thermal simulation model based on the physical characteristics of the battery;

[0007] Establishing a heat conduction model and a heat balance equation of the battery, substituting them into the battery thermal simulation model, and using a numerical solution method to simulate the temperature distribution of the battery under different working conditions to obtain simulation results;

[0008] Optimizing the design of the battery thermal management system based on the simulation results, so as to use the optimized battery thermal management system to perform thermal management on the battery;

[0009] The optimized battery thermal management system is verified based on an actual test environment, and the obtained verification results are used to determine whether to modify the design of the optimized battery thermal management system, and if it is determined that the design of the optimized battery thermal management system is not to be modified, thermal management of the battery is performed based on the optimized battery thermal management system.

[0010] Optionally, the design scheme of optimizing the battery thermal management system based on the simulation results includes:

[0011] Optimizing the heat dissipation structure of the battery based on the simulation results; and / or,

[0012] Optimizing the thermal conductivity path of the battery based on the simulation results; and / or,

[0013] Optimizing the temperature control strategy of the battery based on the simulation results;

[0014] The optimized battery thermal management system is compatible with the spatial structure of the battery and can ensure that the battery works normally under different working conditions.

[0015] Optionally, optimizing the heat dissipation structure of the battery based on the simulation result includes:

[0016] Determine the material and configuration of the battery surface and internal heat dissipation structure based on the simulation results; and / or,

[0017] Determining a heat sink design for the battery based on the simulation results; and / or,

[0018] The fan and air duct system design of the battery is determined based on the simulation results.

[0019] Optionally, optimizing the thermal conductivity path of the battery based on the simulation result includes:

[0020] Determine the key heat conduction part of the heat conduction path based on the simulation results; add heat conducting material to the key heat conduction part; and / or,

[0021] A heat pipe is designed for the battery based on the simulation result, so as to transfer the heat of the battery from a heat source area to a heat dissipation area through the heat pipe.

[0022] Optionally, optimizing the temperature control strategy of the battery based on the simulation result includes:

[0023] Determine the distribution positions of the temperature sensors on the battery according to the simulation results to monitor the temperature at different positions of the battery; and / or,

[0024] A temperature control algorithm of the battery is adjusted based on the simulation result to regulate the operating state of the battery based on real-time temperature data.

[0025] Optionally, the actual test environment includes: setting an expected working scenario of the battery in a laboratory environment, the expected working scenario including a temperature change scenario and a charge and discharge scenario, so as to use the optimized battery thermal management system and the unoptimized battery thermal management system to perform thermal management on the battery in each expected working scenario; accordingly,

[0026] The obtaining of the verification result obtained by verifying the optimized battery thermal management system based on the actual test environment to determine whether to modify the design of the optimized battery thermal management system includes:

[0027] Obtaining the temperature response and battery performance changes of the battery under different expected operating scenarios;

[0028] Based on the temperature response and the battery performance change, it is determined whether to modify the design of the optimized battery thermal management system.

[0029] Optionally, the obtaining of the temperature response of the battery and the change in battery performance under different expected working scenarios includes:

[0030] Acquiring temperature distribution maps of the surface and internal regions of the battery; the temperature response includes the temperature distribution map;

[0031] Determining a degree of improvement in temperature control of the optimized battery thermal management system based on a temperature distribution map corresponding to the optimized battery thermal management system and a temperature distribution map corresponding to the unoptimized battery thermal management system;

[0032] Accordingly, determining whether to modify the design of the optimized battery thermal management system based on the temperature response and the battery performance change includes:

[0033] In the case where the degree of improvement in temperature control reaches the expected degree of improvement, determining not to modify the design of the optimized battery thermal management system;

[0034] When the degree of improvement in temperature control reaches the expected degree of improvement, a design scheme for modifying the optimized battery thermal management system is determined.

[0035] Optionally, the obtaining of the temperature response of the battery and the change in battery performance under different expected working scenarios includes:

[0036] Acquire battery performance of the battery obtained at different monitoring times, wherein the battery performance includes: charging and discharging efficiency, capacity retention rate and power output capability of the system;

[0037] Determining the battery performance change based on the battery performance at each monitoring time;

[0038] Accordingly, determining whether to modify the design of the optimized battery thermal management system based on the temperature response and the battery performance change includes:

[0039] determining whether the battery performance change meets the expected change;

[0040] If the battery performance change meets the expected change, determining not to modify the design of the optimized battery thermal management system;

[0041] If the battery performance change does not meet the expected change, then determine to modify the design of the optimized battery thermal management system.

[0042] Optionally, the heat balance equation includes an internal heat source model, and a convection and radiation heat dissipation model; accordingly,

[0043] The heat conduction model and heat balance equation of the battery are established, substituted into the battery thermal simulation model, and the temperature distribution of the battery under different working conditions is simulated by a numerical solution method to obtain simulation results, including:

[0044] Establishing a thermal conduction model of the battery to simulate the thermal conduction process;

[0045] Based on the electrochemical characteristics and working state of the battery, an internal heat source model of the battery is established to simulate the internal heat source of the battery, and the generation and distribution of heat inside the battery is determined based on the heat capacity, the thermal conductivity and the internal heat generation rate;

[0046] Based on the heat exchange mode between the battery and the environment, a convection and radiation heat dissipation model of the battery is established to simulate the convection heat dissipation process between the battery and the surrounding environment;

[0047] Get the initial temperature distribution and boundary conditions used when solving the model;

[0048] The heat conduction model, the internal heat source model, and the convection and radiation heat dissipation model are substituted into the battery thermal simulation model, and a numerical solution method is used to calculate the temperature distribution of each point inside the battery based on the initial temperature distribution and the boundary conditions to obtain the simulation result, which indicates the temperature change of the battery under different working conditions.

[0049] In a second aspect, a simulation and optimization device for a battery thermal management system is provided, the device comprising:

[0050] Model building module, used to build a battery thermal simulation model based on the physical characteristics of the battery;

[0051] A thermal simulation module is used to establish a thermal conduction model and a thermal balance equation of the battery, and substitute them into the battery thermal simulation model, and use a numerical solution method to simulate the temperature distribution of the battery under different working conditions to obtain simulation results;

[0052] A scheme optimization module, used for optimizing the design scheme of the battery thermal management system based on the simulation results, so as to use the optimized battery thermal management system to perform thermal management on the battery;

[0053] A scheme verification module is used to obtain verification results of the optimized battery thermal management system based on an actual test environment to determine whether to modify the design scheme of the optimized battery thermal management system, and to perform thermal management on the battery based on the optimized battery thermal management system if it is determined that the design scheme of the optimized battery thermal management system will not be modified.

[0054] In a third aspect, a simulation and optimization device for a battery thermal management system is provided, the device comprising a processor and a memory; a program is stored in the memory, and the program is loaded and executed by the processor to implement the simulation and optimization method for the battery thermal management system described in the first aspect.

[0055] In a fourth aspect, a computer-readable storage medium is provided, wherein a program is stored in the storage medium, and the program is loaded and executed by the processor to implement the simulation and optimization method of the battery thermal management system described in the first aspect.

[0056] The beneficial effects of the present application are: by constructing a battery thermal simulation model based on the physical characteristics of the battery; establishing a thermal conduction model and a thermal balance equation of the battery, and substituting them into the battery thermal simulation model, and using a numerical solution method to simulate the temperature distribution of the battery under different working conditions to obtain simulation results; optimizing the design scheme of the battery thermal management system based on the simulation results, so as to use the optimized battery thermal management system to perform thermal management on the battery; obtaining verification results based on the actual test environment for the optimized battery thermal management system to determine whether to modify the design scheme of the optimized battery thermal management system, and if it is determined that the design scheme of the optimized battery thermal management system will not be modified, thermal management of the battery is performed based on the optimized battery thermal management system; it can not only effectively improve the stability and safety of the battery system under extreme temperature conditions, but also extend the service life of the battery and improve its energy utilization efficiency, with significant economic and social benefits.

[0057] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present application in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] Figure 1 is a flow chart of a simulation and optimization method of a battery thermal management system provided by an embodiment of the present application;

[0059] Figure 2 It is a block diagram of a simulation and optimization device for a battery thermal management system provided by an embodiment of the present application. DETAILED DESCRIPTION

[0060] The specific implementation methods of the present application are further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present application but are not intended to limit the scope of the present application.

[0061] Figure 1 This is a flow chart of a simulation and optimization method for a battery thermal management system provided by an embodiment of the present application. This embodiment is described by taking the method applied to an electronic device as an example. The electronic device may be a user terminal or server with computing capabilities. This embodiment does not limit the implementation of the electronic device. The method includes at least the following steps:

[0062] Step 101: construct a battery thermal simulation model based on the physical characteristics of the battery.

[0063] The physical properties of batteries include but are not limited to the following:

[0064] Heat Capacity: refers to the amount of heat that a battery per unit mass or volume can absorb or release under a unit temperature change. Generally, different types of batteries (such as lithium-ion batteries, nickel-metal hydride batteries, etc.) have different heat capacities.

[0065] Thermal Conductivity: It is used to describe the ability of battery materials to conduct heat. Thermal conductivity affects the uniformity of temperature distribution inside the battery and the heat dissipation efficiency.

[0066] Internal Heat Generation Rate: It is used to describe the heat generated by electrochemical reactions during battery charging and discharging. The internal heat generation rate is usually a complex nonlinear function that depends on factors such as the battery current, charge and discharge rate, and temperature.

[0067] The battery thermal simulation model is also established taking into account the thermal conduction and convection heat dissipation processes of the battery.

[0068] The heat conduction process is determined by analyzing the thermal paths inside the battery. Schematically, the thermal paths include the influence of the positive electrode, the negative electrode, the electrolyte and the separator on the heat transfer.

[0069] The convection cooling process is represented by ambient cooling. Ambient cooling considers the heat exchange between the battery and the external environment, such as the influence of natural convection or forced convection, and is usually related to factors such as external temperature and wind speed.

[0070] In one example, a battery thermal simulation model is constructed based on spatial distribution models or electrochemical thermal models.

[0071] Among them, building a battery thermal simulation model based on the spatial distribution model includes: establishing a spatial distribution model of the internal temperature field of the battery based on the finite element method (FiniteElementMethod, FEM) or the finite difference method (FiniteDifferenceMethod, FDM), taking into account the thermal conductivity and heat capacity of each part of the battery.

[0072] A battery thermal simulation model is built based on the electrochemical thermal model, including: coupling the electrochemical reaction kinetics of the battery with the heat conduction process to more accurately predict the battery temperature response.

[0073] Optionally, after the battery thermal simulation model is obtained, the established thermal simulation model may be calibrated and verified according to experimental data or known battery performance parameters.

[0074] Specifically, the established thermal simulation model is calibrated and verified by parameters, including experimental data comparison (Experimental Validation), that is, the simulation results are compared with the actual test data to verify the accuracy and reliability of the thermal simulation model.

[0075] After obtaining the thermal simulation model, the established battery thermal simulation model is applied to the dynamic simulation and real-time monitoring system to predict and optimize the temperature changes of the battery under different working conditions in real time, providing support for the design and optimization of the battery thermal management system.

[0076] Through the above steps, a thermal simulation model that accurately describes the temperature change law of the battery during the charging and discharging process can be established, providing a scientific basis and engineering implementation plan for the optimization of the battery thermal management system.

[0077] Step 102, establish a heat conduction model and a heat balance equation of the battery, substitute them into the battery thermal simulation model, use a numerical solution method to simulate the temperature distribution of the battery under different working conditions, and obtain a simulation result.

[0078] In this embodiment, after obtaining the thermal simulation model, the temperature field simulation analysis of the battery is performed. The temperature field simulation analysis refers to: using numerical solution methods to establish the thermal conduction model and thermal balance equation of the battery to simulate and predict the temperature distribution of the battery under different working conditions,

[0079] Below, the steps and key considerations for temperature field simulation analysis are described in detail.

[0080] In one example, the heat balance equation includes an internal heat source model, and a convection and radiation heat dissipation model; accordingly, a heat conduction model and a heat balance equation of the battery are established and substituted into the battery thermal simulation model, and a numerical solution method is used to simulate the temperature distribution of the battery under different working conditions to obtain a simulation result, including the following steps:

[0081] Step 1: Establish a thermal conduction model of the battery to simulate the heat conduction process.

[0082] In this embodiment, a suitable mathematical model is selected to describe the heat conduction process inside the battery. The mathematical model includes but is not limited to one of the following:

[0083] 1. Finite Element Method (FEM): Decompose the battery into multiple small areas (finite element) and establish the heat balance equation in each small area. Consider the thermal conductivity, heat capacity of the battery material and the heat exchange with the surrounding environment.

[0084] 2. Finite Difference Method (FDM): The space inside the battery is discretized into grid points, and the heat balance equation is established at these points. The numerical solution of the temperature distribution is obtained through iterative calculation.

[0085] Step 2: Based on the electrochemical characteristics and working state of the battery, establish an internal heat source model of the battery to simulate the internal heat source of the battery, and determine the generation and distribution of heat inside the battery based on the heat capacity, thermal conductivity and internal heat generation rate; based on the heat exchange mode between the battery and the environment, establish a convection and radiation heat dissipation model of the battery to simulate the convection heat dissipation process between the battery and the surrounding environment.

[0086] Consider the heat source (heat generated by electrochemical reactions) and heat dissipation (heat exchange with the surrounding environment) inside the battery and couple them with the heat conduction equation. The specific steps include the following:

[0087] Establish an internal heat source model: According to the electrochemical characteristics and working state of the battery, establish a mathematical expression for the internal heat source of the battery. This mathematical expression is usually a nonlinear function of current, voltage and temperature.

[0088] Convection and radiation heat dissipation model: Consider the heat exchange between the battery and the environment, including natural convection, forced convection and possible radiation heat dissipation. These can be modeled based on the battery packaging and housing structure.

[0089] Step 3: Obtain the initial temperature distribution and boundary conditions used when solving the model.

[0090] In order to perform numerical simulation, appropriate initial temperature distribution and boundary conditions need to be set.

[0091] Set initial temperature distribution: The initial temperature distribution can be set according to the actual operating conditions or the results of the previous operation, usually a static distribution.

[0092] Set boundary conditions: including heat conduction, convection and radiation heat exchange conditions between the battery surface and the environment. These conditions directly affect the temperature response and steady-state temperature distribution of the battery.

[0093] Step 4: Substitute the heat conduction model, internal heat source model, convection and radiation heat dissipation model into the battery thermal simulation model, and use the numerical solution method to calculate the temperature distribution of each point inside the battery based on the initial temperature distribution and boundary conditions to obtain the simulation results. The simulation results indicate the temperature changes of the battery under different working conditions.

[0094] Specifically, the established mathematical model can be converted into a discrete equation, and the temperature distribution of each point inside the battery can be calculated by applying a numerical solution method (such as an iteration method or a matrix solution method). Over time, the temperature change of the battery under different working conditions can be simulated.

[0095] Optionally, after obtaining the simulation results, the simulation results can be compared with experimental data to ensure the accuracy and reliability of each model. By analyzing the simulation results, key factors affecting battery temperature distribution, such as heat dissipation design, charging and discharging strategies, etc., can be identified and optimized to improve battery safety and performance.

[0096] Step 103 , optimizing the design of the battery thermal management system based on the simulation results, so as to use the optimized battery thermal management system to perform thermal management on the battery.

[0097] In this embodiment, according to the simulation results, the design of the battery thermal management system is optimized, including the heat dissipation structure, thermal path design, and temperature control strategy, so as to improve the stability and safety of the system under extreme temperature conditions.

[0098] The optimization of each design scheme is described in detail below.

[0099] 1. Optimize the heat dissipation structure of the battery based on the simulation results, including but not limited to at least one of the following:

[0100] a. Determine the material and configuration of the battery surface and internal heat dissipation structure based on the simulation results.

[0101] Schematically, it is preferred to select a material with higher thermal conductivity, such as copper, aluminum or graphite heat spreader, to effectively transfer internal heat to the heat dissipation surface.

[0102] b. Determine the battery heat sink design based on the simulation results.

[0103] Schematically, the heat sink can be designed as a sheet heat sink or a fin heat sink to increase the heat dissipation surface area and enhance the natural convection heat dissipation effect. Ensure that the heat sink can adapt to the size and shape of the battery to maximize the heat dissipation.

[0104] c. Determine the fan and air duct system design of the battery based on the simulation results.

[0105] Schematically, the fan and duct system are designed to improve the efficiency of convection heat dissipation. The fan layout and duct design are optimized to ensure that air can effectively flow over the radiator surface and remove heat.

[0106] 2. Optimize the thermal conductivity path of the battery based on the simulation results, including but not limited to at least one of the following.

[0107] a. Determine the key thermal conductivity parts of the thermal conductivity path based on the simulation results; add thermal conductive materials to the key thermal conductivity parts.

[0108] The optimized thermal conductivity path can ensure that the heat from each part of the battery can be effectively transferred to the external heat dissipation structure. By optimizing the design of the thermal conductivity path, the thermal resistance is reduced. Schematically, materials such as thermal conductive sheets or thermal conductive glue are added to key thermal conductive parts to improve the heat transfer efficiency.

[0109] b. Design a heat pipe for the battery based on the simulation results to transfer the heat of the battery from the heat source area to the heat dissipation area through the heat pipe.

[0110] In this embodiment, heat pipe technology can be used when the temperature difference inside the battery is large or the space is limited. The heat pipe can effectively transfer heat from the heat source area to the heat dissipation area, thereby improving the overall thermal management effect.

[0111] 3. Optimize the temperature control strategy of the battery based on the simulation results, including but not limited to at least one of the following.

[0112] a. Determine the distribution location of the temperature sensors on the battery based on the simulation results to monitor the temperature at different locations of the battery.

[0113] In this example, the optimal temperature sensor layout can be determined based on simulation analysis to monitor the temperature of different parts of the battery in real time and ensure that the sensor can accurately reflect the temperature distribution inside the battery.

[0114] b. Adjust the battery's temperature control algorithm based on the simulation results to regulate the battery's operating state based on real-time temperature data.

[0115] In this example, a temperature control algorithm can be developed or optimized to adjust the working state of the battery system based on real-time temperature data. For example, the charge and discharge rate or working power can be dynamically adjusted based on the battery usage and ambient temperature to maintain the battery operating within a safe temperature range.

[0116] In the above optimization process, the battery structure can also be integrated for comprehensive consideration. Specifically, the optimized battery thermal management system is compatible with the battery's spatial structure and can ensure that the battery works normally under different working conditions.

[0117] Among them, the optimized battery thermal management system is adapted to the spatial structure of the battery, including: optimizing the design scheme to be compatible with the overall structure and size of the battery, maximizing the use of existing space for the layout of the heat dissipation structure and thermal management system, while not affecting the mechanical structure and safety of the battery.

[0118] Ensure that the battery operates normally under different working conditions, including: ensuring that the system can still operate stably in high or low temperature environments, and reducing the risk of battery performance degradation or damage due to excessively high or low temperatures, so as to ensure the safety and reliability of the battery under different working conditions.

[0119] Through the above system optimization design solution, the stability and safety of the battery system under extreme temperature conditions can be effectively improved, the battery life can be extended, and at the same time its performance and reliability can be improved to meet the needs of different application scenarios.

[0120] Step 104, obtain verification results of the optimized battery thermal management system based on the actual test environment to determine whether to modify the design of the optimized battery thermal management system, and if it is determined that the design of the optimized battery thermal management system is not to be modified, perform thermal management on the battery based on the optimized battery thermal management system.

[0121] Performance evaluation and verification of the optimized battery thermal management system is a key step to ensure the effectiveness and reliability of the design. The following is a detailed introduction to the performance evaluation and verification process.

[0122] In this embodiment, the actual test environment includes: setting the expected working scenario of the battery in a laboratory environment, the expected working scenario includes a temperature change scenario and a charging and discharging scenario, so as to use the optimized battery thermal management system and the unoptimized battery thermal management system to perform thermal management on the battery in each expected working scenario. Accordingly, obtaining the verification result of the optimized battery thermal management system based on the actual test environment to determine whether to modify the design of the optimized battery thermal management system includes: obtaining the temperature response of the battery and the change of battery performance in different expected working scenarios; determining whether to modify the design of the optimized battery thermal management system based on the temperature response and the change of battery performance.

[0123] 1. For the temperature change scenario (i.e. temperature test), the following steps are included:

[0124] a. Experimental settings:

[0125] Environmental Conditioning: Testing is performed in a controlled laboratory environment that simulates the temperature range and variations of the expected operating environment.

[0126] Test object: Comparative test using an optimized battery thermal management system and a non-optimized system.

[0127] Test range: including high and low temperature conditions within the typical operating temperature range, such as from -20°C to 60°C

[0128] b. Test method:

[0129] Real-time monitoring: Use high-precision temperature sensors to monitor temperature changes on the battery surface and in various internal areas in real time.

[0130] Record data: Record temperature data, including time series data and spatial distribution of different points, for subsequent analysis and comparison.

[0131] c. Result analysis:

[0132] At this time, the temperature response of the battery and the change in battery performance under different expected working scenarios are obtained, including: obtaining temperature distribution maps of various areas on the battery surface and inside; the temperature response includes a temperature distribution map; based on the temperature distribution map corresponding to the optimized battery thermal management system and the temperature distribution map corresponding to the unoptimized battery thermal management system, the degree of improvement in temperature control of the optimized battery thermal management system is determined; accordingly, based on the temperature response and the change in battery performance, it is determined whether to modify the design scheme of the optimized battery thermal management system, including: when the degree of improvement in temperature control reaches the expected degree of improvement, determining not to modify the design scheme of the optimized battery thermal management system; when the degree of improvement in temperature control reaches the expected degree of improvement, determining to modify the design scheme of the optimized battery thermal management system.

[0133] In this example, by generating temperature distribution diagrams for different parts of the battery, the temperature balance and control effect of the optimized thermal management system can be evaluated. Afterwards, the temperature data of the optimized system is compared and analyzed with the unoptimized system to evaluate the degree of improvement in temperature control brought about by the optimization.

[0134] 2. For the charge and discharge scenario (i.e., long-term stability test), the following steps are included:

[0135] a. Experimental settings:

[0136] Continuous operation test: The optimized battery system is placed under actual workload conditions and continuously operated for a period of time, such as weeks to months.

[0137] Cyclic charge and discharge: Simulate actual usage scenarios, perform cyclic charge and discharge tests on the battery, and check the temperature response and stability of the system under different charge and discharge conditions.

[0138] b. Monitoring and evaluation:

[0139] Periodic inspection: Regularly monitor battery and system temperature changes and record any abnormalities or persistent problems.

[0140] Performance change assessment: Check the battery’s charge and discharge efficiency, capacity retention rate, and system power output capability to evaluate long-term stability performance.

[0141] At this time, the temperature response and battery performance changes of the battery under different expected working scenarios are obtained, including: obtaining the battery performance of the battery obtained at different monitoring times, the battery performance including: the battery charging and discharging efficiency, capacity retention rate and the power output capability of the system; and determining the battery performance changes based on the battery performance at each monitoring time.

[0142] c. Data analysis and correction:

[0143] At this time, based on the temperature response and battery performance changes, determine whether to modify the design of the optimized battery thermal management system, including: determining whether the battery performance changes meet the expected changes; if the battery performance changes meet the expected changes, determine not to modify the design of the optimized battery thermal management system; if the battery performance changes do not meet the expected changes, determine to modify the design of the optimized battery thermal management system.

[0144] Specifically, fault analysis: If abnormal temperature or performance degradation is found, analyze the possible causes and consider whether it is necessary to further optimize the design or adjust the control strategy.

[0145] Feedback and Improvement: Based on the long-term test results, feedback is provided to the design team to make necessary improvements and adjustments to further improve the reliability and performance of the system.

[0146] Afterwards, the optimized battery thermal management system can be reported and validated.

[0147] Specifically, the performance evaluation report includes: summarizing all test data and analysis results, and writing a detailed performance evaluation report.

[0148] The verification conclusions include: Based on experimental data and analysis, the effectiveness and reliability of the optimized battery thermal management system under design conditions are verified.

[0149] The experimenter can summarize the conclusions and suggestions: put forward targeted conclusions and suggestions to guide the further engineering design and application field promotion of the product.

[0150] In this embodiment, through the above-mentioned performance evaluation and verification steps, the design effect of the optimized battery thermal management system can be comprehensively evaluated, and its reliability and stability in the actual working environment can be ensured, thereby meeting the needs of different application scenarios.

[0151] In summary, the simulation and optimization method of the battery thermal management system provided in this embodiment constructs a battery thermal simulation model based on the physical characteristics of the battery; establishes a thermal conduction model and a thermal balance equation of the battery, and substitutes them into the battery thermal simulation model, and uses a numerical solution method to simulate the temperature distribution of the battery under different working conditions to obtain simulation results; optimizes the design scheme of the battery thermal management system based on the simulation results, so as to use the optimized battery thermal management system to perform thermal management on the battery; obtains verification of the optimized battery thermal management system based on an actual test environment, and obtains the verification results to determine whether to modify the design scheme of the optimized battery thermal management system, and when it is determined that the design scheme of the optimized battery thermal management system is not modified, thermal management of the battery is performed based on the optimized battery thermal management system; it can not only effectively improve the stability and safety of the battery system under extreme temperature conditions, but also extend the service life of the battery and improve its energy utilization efficiency, with significant economic and social benefits.

[0152] Figure 2 1 is a block diagram of a simulation and optimization device for a battery thermal management system provided by an embodiment of the present application. The device includes at least the following modules: a model building module 210 , a thermal simulation module 220 , a solution optimization module 230 and a solution verification module 240 .

[0153] A model building module 210, for building a battery thermal simulation model based on the physical characteristics of the battery;

[0154] The thermal simulation module 220 is used to establish a thermal conduction model and a thermal balance equation of the battery, and substitute them into the battery thermal simulation model, and use a numerical solution method to simulate the temperature distribution of the battery under different working conditions to obtain simulation results;

[0155] A solution optimization module 230, configured to optimize a design solution of a battery thermal management system based on the simulation result, so as to use the optimized battery thermal management system to perform thermal management on the battery;

[0156] The solution verification module 240 is used to obtain verification results of the optimized battery thermal management system based on the actual test environment to determine whether to modify the design solution of the optimized battery thermal management system, and to perform thermal management on the battery based on the optimized battery thermal management system if it is determined that the design solution of the optimized battery thermal management system will not be modified.

[0157] For relevant details, refer to the above method embodiment.

[0158] It should be noted that: the simulation and optimization device of the battery thermal management system provided in the above embodiment only uses the division of the above functional modules as an example when performing the simulation and optimization method of the battery thermal management system. In actual applications, the above functional distribution can be completed by different functional modules as needed, that is, the internal structure of the simulation and optimization device of the battery thermal management system is divided into different functional modules to complete all or part of the functions described above. In addition, the simulation and optimization device of the battery thermal management system provided in the above embodiment and the simulation and optimization method embodiment of the battery thermal management system belong to the same concept. The specific implementation process is detailed in the method embodiment, which will not be repeated here.

[0159] Optionally, the present application also provides a computer-readable storage medium, in which a program is stored, and the program is loaded and executed by a processor to implement the simulation and optimization method of the battery thermal management system of the above method embodiment.

[0160] Optionally, the present application also provides a computer product, which includes a computer-readable storage medium, in which a program is stored, and the program is loaded and executed by a processor to implement the simulation and optimization method of the battery thermal management system of the above method embodiment.

[0161] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0162] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A simulation and optimization method for a battery thermal management system, characterized in that: The method comprises: Build a battery thermal simulation model based on the physical characteristics of the battery; Establishing a heat conduction model and a heat balance equation of the battery, substituting them into the battery thermal simulation model, and using a numerical solution method to simulate the temperature distribution of the battery under different working conditions to obtain simulation results; Optimizing the design of the battery thermal management system based on the simulation results, so as to use the optimized battery thermal management system to perform thermal management on the battery; The optimized battery thermal management system is verified based on an actual test environment, and the obtained verification results are used to determine whether to modify the design of the optimized battery thermal management system, and if it is determined that the design of the optimized battery thermal management system is not to be modified, thermal management of the battery is performed based on the optimized battery thermal management system.

2. The method according to claim 1, characterized in that: The design scheme for optimizing the battery thermal management system based on the simulation results includes: Optimizing the heat dissipation structure of the battery based on the simulation results; and / or, Optimizing the thermal conductivity path of the battery based on the simulation results; and / or, Optimizing the temperature control strategy of the battery based on the simulation results; The optimized battery thermal management system is compatible with the spatial structure of the battery and can ensure that the battery works normally under different working conditions.

3. The method according to claim 2, characterized in that Optimizing the heat dissipation structure of the battery based on the simulation result includes: Determine the material and configuration of the battery surface and internal heat dissipation structure based on the simulation results; and / or, Determining a heat sink design for the battery based on the simulation results; and / or, The fan and air duct system design of the battery is determined based on the simulation results.

4. The method according to claim 2, characterized in that: The optimizing the thermal conduction path of the battery based on the simulation result comprises: Determine the key heat conduction part of the heat conduction path based on the simulation results; add heat conducting material to the key heat conduction part; and / or, A heat pipe is designed for the battery based on the simulation result, so as to transfer the heat of the battery from a heat source area to a heat dissipation area through the heat pipe.

5. The method according to claim 2, characterized in that: The optimizing the temperature control strategy of the battery based on the simulation result includes: Determine the distribution positions of the temperature sensors on the battery according to the simulation results to monitor the temperature at different positions of the battery; and / or, A temperature control algorithm of the battery is adjusted based on the simulation result to regulate the operating state of the battery based on real-time temperature data.

6. The method according to claim 1, characterized in that The actual test environment includes: setting the expected working scenario of the battery in a laboratory environment, wherein the expected working scenario includes a temperature change scenario and a charge and discharge scenario, so as to use the optimized battery thermal management system and the unoptimized battery thermal management system to perform thermal management on the battery in each expected working scenario; accordingly, The obtaining of the verification result obtained by verifying the optimized battery thermal management system based on the actual test environment to determine whether to modify the design of the optimized battery thermal management system includes: Obtaining the temperature response and battery performance changes of the battery under different expected operating scenarios; Based on the temperature response and the battery performance change, it is determined whether to modify the design of the optimized battery thermal management system.

7. The method according to claim 6, characterized in that The obtaining of the temperature response and battery performance change of the battery under different expected working scenarios includes: Acquiring temperature distribution maps of the surface and internal regions of the battery; the temperature response includes the temperature distribution map; Determining a degree of improvement in temperature control of the optimized battery thermal management system based on a temperature distribution map corresponding to the optimized battery thermal management system and a temperature distribution map corresponding to the unoptimized battery thermal management system; Accordingly, determining whether to modify the design of the optimized battery thermal management system based on the temperature response and the battery performance change includes: In the case where the degree of improvement in temperature control reaches the expected degree of improvement, determining not to modify the design of the optimized battery thermal management system; When the degree of improvement in temperature control reaches the expected degree of improvement, a design scheme for modifying the optimized battery thermal management system is determined.

8. The method according to claim 6, characterized in that The obtaining of the temperature response and battery performance change of the battery under different expected working scenarios includes: Acquire battery performance of the battery obtained at different monitoring times, wherein the battery performance includes: charging and discharging efficiency, capacity retention rate and power output capability of the system; Determining the battery performance change based on the battery performance at each monitoring time; Accordingly, determining whether to modify the design of the optimized battery thermal management system based on the temperature response and the battery performance change includes: determining whether the battery performance change meets the expected change; If the battery performance change meets the expected change, determining not to modify the design of the optimized battery thermal management system; If the battery performance change does not meet the expected change, then determine to modify the design of the optimized battery thermal management system.

9. The method according to any one of claims 1 to 8, characterized in that: The heat balance equation includes an internal heat source model, and a convection and radiation heat dissipation model; accordingly, The heat conduction model and heat balance equation of the battery are established, substituted into the battery thermal simulation model, and the temperature distribution of the battery under different working conditions is simulated by a numerical solution method to obtain simulation results, including: Establishing a thermal conduction model of the battery to simulate the thermal conduction process; Based on the electrochemical characteristics and working state of the battery, an internal heat source model of the battery is established to simulate the internal heat source of the battery, and the generation and distribution of heat inside the battery is determined based on the heat capacity, the thermal conductivity and the internal heat generation rate; Based on the heat exchange mode between the battery and the environment, a convection and radiation heat dissipation model of the battery is established to simulate the convection heat dissipation process between the battery and the surrounding environment; Get the initial temperature distribution and boundary conditions used when solving the model; The heat conduction model, the internal heat source model, and the convection and radiation heat dissipation model are substituted into the battery thermal simulation model, and a numerical solution method is used to calculate the temperature distribution of each point inside the battery based on the initial temperature distribution and the boundary conditions to obtain the simulation result, which indicates the temperature change of the battery under different working conditions.

10. A simulation and optimization device for a battery thermal management system, characterized in that: The device comprises: Model building module, used to build a battery thermal simulation model based on the physical characteristics of the battery; A thermal simulation module is used to establish a thermal conduction model and a thermal balance equation of the battery, and substitute them into the battery thermal simulation model, and use a numerical solution method to simulate the temperature distribution of the battery under different working conditions to obtain simulation results; A scheme optimization module, used for optimizing the design scheme of the battery thermal management system based on the simulation results, so as to use the optimized battery thermal management system to perform thermal management on the battery; A scheme verification module is used to obtain verification results of the optimized battery thermal management system based on an actual test environment to determine whether to modify the design scheme of the optimized battery thermal management system, and to perform thermal management on the battery based on the optimized battery thermal management system if it is determined that the design scheme of the optimized battery thermal management system will not be modified.

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