Thermotank temperature change simulation method and device and computer equipment

Abstract

The invention relates to a thermotank temperature change simulation method and device and computer equipment. The thermotank temperature change simulation method comprises the steps of obtaining charging and discharging test data of a battery cell; constructing a heat balance equation of the battery cell and the constant-temperature box; configuring boundary conditions corresponding to the constant-temperature box; constructing a simulation model according to the actual sizes of the battery cell and the constant-temperature box, the charging and discharging test data, and the heat balance equation and boundary conditions of the battery cell and the constant-temperature box; acquiring a temperature change simulation result of the simulation model in the charge and discharge test process of the battery cell; the battery cell is a geometric entity domain corresponding to the battery cell. According to the method, the actual constant-temperature box can be accurately simulated, the temperature change simulation result can be obtained according to the simulation model, and the difference caused by the consistency of the battery cells is eliminated, so that the reason causing the environment temperature change of the constant-temperature box can be more accurately evaluated according to the final temperature change simulation result.

Description

Technical Field

[0001] The present application relates to the technical field of thermostats, and in particular to a method, device and computer equipment for simulating temperature changes in a thermostat. Background Art

[0002] Lithium-ion batteries are currently the most widely used chemical energy storage materials, with the characteristics of high energy density, low self-discharge rate, and long cycle life. Due to their advantages, lithium-ion batteries have been widely used in electric vehicles, electronic equipment, and energy storage.

[0003] The performance of the battery cell can be evaluated through corresponding tests. These tests are usually completed in a constant temperature chamber. The uniformity of the ambient temperature of the constant temperature chamber and the difference from the target temperature affect the consistency of the battery cell performance test. There are usually two reasons for the temperature fluctuation of the constant temperature chamber. The first reason is that the battery cell will generate heat during the charging and discharging process of the constant temperature chamber, causing the ambient temperature in the constant temperature chamber to fluctuate; the other reason is that the temperature PID (a controller including proportional, integral and derivative control) of the constant temperature chamber itself is not well controlled, and the temperature control effect is unstable.

[0004] The traditional method uses experiments to evaluate the causes of changes in the ambient temperature of the incubator. However, the battery cells themselves will also cause temperature changes during the corresponding tests, and there will also be differences in the consistency of the battery cells themselves, which will introduce other errors, making it difficult to accurately evaluate the causes of changes in the ambient temperature of the incubator. Summary of the invention

[0005] Based on this, it is necessary to provide a thermostat temperature change simulation method, device and computer equipment that can accurately evaluate the causes of changes in the thermostat ambient temperature in order to address the above technical problems.

[0006] In a first aspect, the present application provides a method for simulating temperature changes in a thermostat, comprising:

[0007] Obtain the charge and discharge test data related to the battery cell and temperature;

[0008] Constructing a thermal balance equation for the battery cell and the thermostat;

[0009] Constructing the geometric entity domains of the battery cell and the thermostat according to the actual sizes of the battery cell and the thermostat;

[0010] Configure the boundary conditions corresponding to the thermostat;

[0011] Constructing a simulation model according to the charge and discharge test data, the thermal balance equation of the battery cell and the thermostat, the geometric entity domains of the battery cell and the thermostat, and the boundary conditions;

[0012] The temperature change simulation result of the simulation model during the charge and discharge test of the battery cell is obtained.

[0013] In one embodiment, constructing the thermal balance equation of the battery cell and the thermostat includes:

[0014] Respectively obtaining property parameters of the battery core, the fluid material in the thermostat, and the boundary components in the thermostat;

[0015] Constructing a first heat balance equation according to the property parameters of the battery cell and the heat absorbed by the thermostat;

[0016] constructing a second heat balance equation according to the property parameters of the boundary components in the thermostatic box and the heat absorbed by the thermostatic box;

[0017] Constructing a third heat balance equation according to the property parameters of the fluid substance and the heat absorbed by the thermostat;

[0018] A fourth heat balance equation is constructed according to the property parameters of the fluid substance, the fluid pressure of the thermostat and the gravitational acceleration.

[0019] In one embodiment, the property parameters include thermal property density, specific heat capacity, and thermal conductivity; obtaining the property parameters of the battery cell includes:

[0020] The specific heat capacity, thermal property density and thermal conductivity of the battery cell in the x, y and z directions are obtained respectively.

[0021] In one embodiment, the property parameters include thermal property density, specific heat capacity, and thermal conductivity; obtaining the property parameters of the fluid material includes:

[0022] Get the specific heat capacity, thermal property density, and thermal conductivity of air.

[0023] In one embodiment, the property parameters include thermal property density, specific heat capacity, and thermal conductivity; obtaining the property parameters of the boundary components in the constant temperature box includes:

[0024] Get the specific heat capacity, thermal property density, and thermal conductivity of the Steel material.

[0025] In one embodiment, the charge and discharge test data includes an adiabatic temperature rise curve, a calorific value curve, a heating power, a voltage curve, and a multi-point temperature curve of the battery cell; and obtaining the charge and discharge test data associated with the battery cell and the temperature includes:

[0026] The battery cell is subjected to a charge and discharge test under adiabatic conditions by using an ARC adiabatic accelerating calorimeter to obtain the adiabatic temperature rise curve, calorific value curve, heating power, voltage curve, and multi-point temperature curve of the battery cell.

[0027] In one embodiment, the configuration and the boundary conditions corresponding to the constant temperature box include:

[0028] The flow rate of the air inlet in the thermostat, the heat exchange power of the fan in the thermostat, the initial temperature of the thermostat and the heat transfer coupling variables between the fluid substance and the thermostat are configured respectively.

[0029] In one embodiment, a simulation model is constructed according to the charge and discharge test data, the thermal balance equation of the battery cell and the thermostat, the geometric entity domains of the battery cell and the thermostat, and the boundary conditions, including:

[0030] Performing mesh division and mesh processing on the geometric entity domains of the battery cell and the constant temperature box;

[0031] Disposing a fluid substance in the geometric entity domain of the thermostatic box;

[0032] A simulation model is constructed according to the fluid substance, the geometric entity domain of the battery cell, the charge and discharge test data, the thermal balance equation of the battery cell and the thermostat, and the boundary conditions.

[0033] In one embodiment, meshing and mesh processing are performed on the geometric entity domains of the battery cell and the constant temperature box, including:

[0034] Encrypting the mesh corresponding to the geometric entity domain of the battery cell;

[0035] Boundary layer mesh processing is performed on meshes corresponding to the geometric entity domain of the air inlet in the thermostatic box and meshes corresponding to the geometric entity domain of the fan in the thermostatic box respectively.

[0036] In one embodiment, the temperature change simulation result includes a battery cell temperature change simulation result and an ambient temperature change simulation result of the thermostat; and obtaining the temperature change simulation result of the simulation model during the battery cell charge and discharge test includes:

[0037] Placing the geometric entity domains of the plurality of battery cells at a preset position; the preset position placement includes at least one of horizontally aligning the geometric entity domains of the plurality of battery cells, vertically aligning the geometric entity domains of the plurality of battery cells, and staggered arranging the geometric entity domains of the plurality of battery cells;

[0038] The geometric entity domains of the plurality of battery cells placed at the preset positions are simultaneously subjected to charge and discharge tests to respectively obtain corresponding battery cell temperature change simulation results and ambient temperature change simulation results of the constant temperature box.

[0039] In a second aspect, the present application further provides a thermostat temperature change simulation device, the thermostat temperature change simulation device comprising:

[0040] A test module is used to obtain charge and discharge test data associated with the battery cell and temperature;

[0041] An equation building module, used to build a thermal balance equation for the battery cell and the thermostat;

[0042] A geometric entity domain construction module, used to construct the geometric entity domains of the battery cell and the thermostat according to the actual sizes of the battery cell and the thermostat;

[0043] A condition configuration module, used to configure boundary conditions corresponding to the constant temperature box;

[0044] A model building module, used for building a simulation model according to the charge and discharge test data, the thermal balance equation of the battery cell and the thermostat, the geometric entity domains of the battery cell and the thermostat, and the boundary conditions;

[0045] The simulation module is used to obtain the temperature change simulation result of the simulation model during the charge and discharge test of the battery cell.

[0046] In a third aspect, the present application further provides a computer device, comprising a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the above method when executing the computer program.

[0047] In a fourth aspect, the present application also provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program implements the steps of the above method when executed by a processor.

[0048] In a fifth aspect, the present application also provides a computer program product, including a computer program, which implements the steps of the above method when executed by a processor.

[0049] The above-mentioned thermostat temperature change simulation method, device, computer equipment, computer-readable storage medium and computer program product obtain charge and discharge test data related to battery cells and temperature; construct the thermal balance equation of battery cells and thermostat; construct the geometric entity domain of battery cells and thermostat according to the actual dimensions of battery cells and thermostat; configure boundary conditions corresponding to the thermostat; construct a simulation model according to the charge and discharge test data, the thermal balance equation of battery cells and thermostat, the geometric entity domain of battery cells and thermostat and the boundary conditions; obtain the temperature change simulation result of the simulation model during the charge and discharge test of the battery cells. In this application, the actual dimensions of the battery cells and the thermostat, the charge and discharge test data, the thermal balance equations of the battery cells and the thermostat, the geometric entity domains of the battery cells and the thermostat and the boundary conditions are introduced when constructing the simulation model, so that the actual thermostat can be accurately simulated. The charge and discharge test data are introduced when constructing the simulation model, and the input parameters of multiple battery cells in the simulation model are completely consistent. Therefore, the temperature change simulation results obtained according to the simulation model can eliminate the differences caused by the consistency of the battery cells themselves. According to the final temperature change simulation results, the causes of the changes in the ambient temperature of the thermostat can be more accurately evaluated. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the drawings required for use in the embodiments of the present application or related technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0051] Figure 1 One of the flow charts of a method for simulating temperature change of a thermostat in one embodiment;

[0052] Figure 2 A schematic diagram of the structure of a geometric entity domain drawn in one embodiment;

[0053] Figure 3 A schematic diagram of a process for constructing a thermal balance equation for a battery cell and a thermostat in one embodiment;

[0054] Figure 4 A schematic diagram of a process for building a simulation model according to charge and discharge test data, thermal balance equations of a battery cell and a thermostat, geometric entity domains of the battery cell and the thermostat, and boundary conditions in one embodiment;

[0055] Figure 5 A schematic diagram of a flow chart of obtaining a simulation result of temperature change of the simulation model during a charge and discharge test of a battery cell in an embodiment;

[0056] Figure 6It is a temperature variation curve of the battery cell when the geometric entity domain of the battery cell in one embodiment is placed in different positions for charge and discharge test;

[0057] Figure 7 It is a curve of the environmental temperature change of a constant temperature box when the geometric entity domain of the battery cell in one embodiment is placed in different positions for charge and discharge test;

[0058] Figure 8 A schematic diagram of the temperature distribution in a constant temperature box simulated by a simulation model when the geometric entity domains of multiple battery cells are horizontally aligned in one embodiment;

[0059] Fig. 9 A schematic diagram of the temperature distribution in a constant temperature box simulated by a simulation model when the geometric entities of multiple battery cells are horizontally staggered in one embodiment;

[0060] Fig.10 The second flow chart of the method for simulating temperature change of a thermostat in one embodiment;

[0061] Fig.11 A structural block diagram of a thermostat temperature change simulation device in an embodiment;

[0062] Fig.12 FIG. 4 is a diagram showing the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0063] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0064] In one embodiment, Figure 1 As shown, attached Figure 1 This is one of the flow diagrams of the thermostat temperature change simulation method in this embodiment. This embodiment provides a thermostat temperature change simulation method. This embodiment uses the method applied to a terminal as an example. It can be understood that the method can also be applied to a server, and can also be applied to a system including a terminal and a server, and is implemented through the interaction between the terminal and the server. In this embodiment, the method includes the following steps S101 to S106.

[0065] Step S101, acquiring charging and discharging test data associated with the battery cell and temperature.

[0066] The charge and discharge test data of the battery cell refers to the curve of the performance parameters of the battery cell changing over time during the charge and discharge test under preset conditions. The performance parameters include temperature, calorific value, heating power, voltage, etc.

[0067] In step S101, there is no restriction on the way of charging and discharging the battery cell, and it is only necessary to ensure that accurate charging and discharging test data can be obtained. For example, the battery cell can be charged and discharged under a preset environment. For example, in order to obtain accurate performance parameters related to temperature, the battery cell can be tested under an adiabatic environment. For example, it can be performed in a battery adiabatic tester.

[0068] Step S102, constructing a thermal balance equation of the battery cell and the thermostat.

[0069] The heat balance equation is an equation used to describe the heat exchange between systems at different temperatures until the energy changes of each system are reached at the same temperature. In this embodiment, constructing the heat balance equation of the battery cell and the thermostat helps to accurately simulate the heat exchange between the battery cell, the thermostat, and other structures and materials in the thermostat that may affect the temperature change when the battery cell is charged and discharged in the thermostat.

[0070] Specifically, it can be constructed based on the material properties of the battery cell and the constant temperature box and the heat transfer control equations of solids, fluids, etc.

[0071] Step S103, constructing the geometric entity domains of the battery cell and the thermostat according to the actual sizes of the battery cell and the thermostat.

[0072] The actual size of the battery cell and the thermostat refers to the actual size of the battery cell, the actual size of the thermostat body, and the actual size of each structure inside the thermostat. The geometric entity domain refers to the geometric entity domain corresponding to the battery cell, the thermostat body, and the internal entity structure.

[0073] According to the actual size of the battery cell and the thermostat, the main structures related to heat conduction including the battery cell, the thermostat and the thermostat are drawn to construct the geometric entity domain of the battery cell and the thermostat. Figure 2 , attached Figure 2 The schematic diagram of the structure of the geometric entity domain drawn in step S103 is shown. The simplified structure of the battery cell 210 and the thermostat can be drawn according to the actual size of the battery cell. For example, the battery cell 210 can be simplified into a square heating element to reduce the number of grids. However, since the structure of the battery cell 210 has little effect on the heat generation, the heating of the battery cell 210 can also be accurately described. When drawing the geometric entity domain of the thermostat, it can be considered to only draw the air inlet 220 and the fan 230 in the thermostat, without drawing the boundary components of the thermostat, that is, the body of the thermostat. Figure 2The dotted line in the figure refers to the actual thermostat box body. When constructing the simulation model, in order to avoid a large increase in the number of grids caused by the thin layer structure, the specific outer boundary entity domain of the thermostat is not drawn. Therefore, the geometric entity domains of the air inlet 220 and the fan 230 in the thermostat equipped with fluid material are drawn based on the actual sizes of the battery cells and the thermostat, and the virtual thickness of the material of the boundary component is used to equivalently replace the outer entity domain of the thermostat. This reduces the amount of simulation calculations of the simulation model on the basis of accurately simulating the temperature changes of the thermostat.

[0074] Step S104, configuring boundary conditions corresponding to the constant temperature box.

[0075] Boundary conditions refer to the constraints on physical quantities (such as temperature, heat, speed, etc.) on the system boundary when solving physical problems. Correct boundary conditions can ensure that the results of numerical simulation are both accurate and practical. It is a bridge connecting theoretical models with actual conditions. In this embodiment, the boundary conditions corresponding to the thermostat can refer to the working parameters of the heat dissipation components of the thermostat and the environmental parameters in the thermostat. Configuring boundary conditions corresponding to the thermostat helps to simulate the heat exchange process in the real world and improve the accuracy and reliability of simulation.

[0076] Step S105 , constructing a simulation model according to the charge and discharge test data, the thermal balance equations of the battery cell and the thermostat, the geometric entity domains of the battery cell and the thermostat, and the boundary conditions.

[0077] After constructing the geometric entity domains of the battery cells and the constant temperature box, the physical field is further constructed according to the thermal balance equations of the battery cells and the constant temperature box. The charge and discharge test data are used as the input of the heat generation of the battery cells to truly simulate the heat generation of the battery cells during the charge and discharge process. Finally, the boundary conditions are set to form a simulation model.

[0078] In addition, in order to avoid a large increase in the number of grids caused by thin layer structures, the thermostat body and some structures inside it that are not related to heat conduction can be simplified when constructing the simulation model. For example, when drawing the corresponding geometric entity domain according to the actual size of the battery cell and the thermostat, the external entity domain of the thermostat can be equivalently replaced by using the virtual thickness definition of the boundary layer material, that is, the specific outer boundary entity domain of the thermostat is not drawn, and its heat transfer characteristics are only introduced when constructing the thermal balance equation of the thermostat.

[0079] Step S106, obtaining the simulation result of the temperature change of the simulation model during the charge and discharge test of the battery cell.

[0080] It is understandable that the ambient temperature fluctuation under low temperature conditions will be greater than that of a constant temperature incubator at normal temperature. Generally, there are two main reasons for the ambient temperature fluctuation of the constant temperature incubator: one reason is that the battery cells will generate heat during the charging and discharging process of the constant temperature in the incubator, causing the ambient temperature in the incubator to fluctuate; the other reason is that the temperature PID control of the constant temperature incubator itself is not good, and the temperature control effect is unstable. Therefore, in order to analyze the reasons for the changes in ambient temperature, the above-mentioned temperature simulation results can include the changes in the ambient temperature of the constant temperature in the simulation model during the charging and discharging of the battery cells, the temperature changes of the battery cells in the simulation model when the battery cells are placed in different positions, and so on.

[0081] In this embodiment, the actual dimensions of the battery cells and the thermostat, the charge and discharge test data, the thermal balance equations of the battery cells and the thermostat, the geometric entity domains of the battery cells and the thermostat and the boundary conditions are introduced when constructing the simulation model, so that the actual thermostat can be accurately simulated. The charge and discharge test data are introduced when constructing the simulation model, and the input parameters of the battery cells in the simulation model are completely consistent. Therefore, the temperature change simulation results obtained according to the simulation model can eliminate the differences caused by the consistency of the battery cells themselves. According to the final temperature change simulation results, the causes of the changes in the ambient temperature of the thermostat can be more accurately evaluated.

[0082] Heat conduction in a thermostat is a relatively complex process. It involves issues such as fluid materials, solid materials and their pressure in the thermostat. Therefore, in a possible implementation, it is possible to consider constructing heat balance equations that represent the heat transfer of different materials separately when constructing the heat balance equation. In one embodiment, take the thermostat including fluid materials and boundary components as an example. The fluid material refers to the material in the space inside the thermostat except the solid structure; the boundary component refers to the boundary structure that separates the inside and outside of the thermostat. The heat balance equation includes a first heat balance equation, a second heat balance equation, a third heat balance equation and a fourth heat balance equation. The first heat balance equation and the second heat balance equation are used to represent the heat transfer problem of stationary solids (battery cores and boundary components); the third heat balance equation is used to represent the heat transfer problem of fluid materials; and the fourth heat balance equation is used to represent the problem of fluid material and pressure flow. See the attached. Figure 3 , attached Figure 3 The schematic diagram of the process of constructing the thermal balance equation of the battery cell and the thermostat in this embodiment is shown. Constructing the thermal balance equation of the battery cell and the thermostat includes the following steps S301 to S305.

[0083] Step S301, respectively obtaining the property parameters of the battery cell, the fluid material in the thermostat, and the boundary components in the thermostat.

[0084] The above-mentioned property parameters refer to the physical property parameters of the battery cell, fluid material and boundary components that will affect the temperature, such as thermal property density, specific heat capacity, thermal conductivity, etc. For fluid materials, it can also be fluid properties such as dynamic viscosity and pressure.

[0085] And because the heat inside the thermostat is conducted through direct contact of solid parts, and the heat of the fluid material is transferred through convection, introducing the heat absorbed by the thermostat when constructing the heat balance equation helps to accurately represent the problems related to solid heat transfer and fluid material heat transfer.

[0086] Step S302: construct a first heat balance equation according to the property parameters of the battery cell and the heat absorbed by the thermostat.

[0087] The first heat balance equation is used to express the problem of heat transfer in static solids. Since the temperature change of the thermostat belongs to the coupled heat transfer between the fluid material and the solid structure, it satisfies the heat balance equation. For the problem of heat transfer in static solids, when only heat conduction is considered, taking the property parameters including thermal property density, specific heat capacity, and thermal conductivity as an example, the first heat balance equation is: ; where ρ is the thermal property density; C P is the specific heat capacity, k is the thermal conductivity, and Q is the heat absorbed by the constant temperature box.

[0088] Step S303: construct a second heat balance equation according to the property parameters of the boundary components in the thermostat and the heat absorbed by the thermostat.

[0089] Similar to the first heat balance equation, the second heat balance equation describes the heat transfer problem of the boundary component. The boundary component can also be understood as a stationary solid. Therefore, the second heat balance equation is also used to express the heat transfer problem of the stationary solid. Since the temperature change of the thermostat belongs to the coupled heat transfer of the fluid material and the solid structure, it satisfies the heat balance equation. For the heat transfer problem of the boundary component, when only heat conduction is considered, taking the attribute parameters including thermal attribute density, specific heat capacity, and thermal conductivity as an example, the second heat balance equation can also be described as: ; where ρ is the thermal property density; C P is the specific heat capacity, k is the thermal conductivity, and Q is the heat absorbed by the constant temperature box.

[0090] Step S304: construct a third heat balance equation according to the property parameters of the fluid substance and the heat absorbed by the thermostat.

[0091] For the heat transfer problem of fluid materials, when the compressibility of the fluid is ignored (ignoring the pressure work term) and the viscous force of the fluid is ignored (ignoring the viscous heating term), the third heat balance equation is: ; where ρ is the thermal property density; C P is the specific heat capacity, u is the fluid dynamic viscosity of the fluid material, k is the thermal conductivity, and Q is the heat absorbed by the constant temperature box.

[0092] Step S305: construct a fourth heat balance equation according to the property parameters of the fluid substance, the fluid pressure of the thermostat and the gravitational acceleration.

[0093] There are three ways of heat transfer: thermal radiation, thermal convection, and thermal conduction. The fluid heat exchange of the thermostat is more of a way of thermal convection to remove heat, which is generally controlled by changing the flow rate of the gas. The working principle of the thermostat is that when the ambient temperature is higher than a certain temperature, the speed of the fan is increased to change the convection heat transfer rate of the gas, and the high-temperature gas is taken away faster. Therefore, when constructing the heat balance equation, the introduction of the fluid pressure of the thermostat can more accurately describe the heat conduction process in the thermostat.

[0094] For problems with fluid material and pressure flow, the fourth heat balance equation can be described by the Naviers-Stokes equation (NS equation): , ρ is the thermal property density; C P is the specific heat capacity, u is the fluid dynamic viscosity of the fluid substance, T is the temperature in the constant temperature box, and g is the gravitational acceleration.

[0095] In this embodiment, the problems of describing the heat transfer of fluid substances, the heat transfer of solid substances, and the flow of fluid substances and pressure are constructed separately, and the fluid-solid coupling of the thermostat is fully considered, so that the temperature change of the thermostat can be accurately described.

[0096] It is understandable that the characteristics of the property parameters may be different depending on the properties of the object itself. For example, in the case of a battery cell, since its material may not be a single material, its thermal conductivity may not be isotropic. Therefore, when obtaining the property parameters of different structures, it is necessary to combine the characteristics of the structure itself. Take the property parameters including thermal property density, specific heat capacity, and thermal conductivity as an example; in one embodiment, obtaining the property parameters of the battery cell includes: respectively obtaining the specific heat capacity, thermal property density, and thermal conductivity of the battery cell in the x, y, and z directions.

[0097] Since the core JR inside the battery cell is usually made of composite materials, the thermal conductivity of the battery cell is anisotropic. The thermal conductivity k of the battery cell in the x, y, and z directions can be obtained by weighting the principle of series-parallel thermal resistance. x , k y , k z , specific heat capacity of the core C P1 It can be obtained by mass weighted average, and the thermal property density ρ1 of the core can also be obtained by mass weighted average. In other embodiments, if the core inside the battery cell is made of a single material and is specifically isotropic, the specific heat capacity, thermal property density and thermal conductivity of the corresponding material can also be directly obtained.

[0098] In this embodiment, the specific heat capacity, thermal property density and thermal conductivity of the battery cell in the x, y and z directions are obtained respectively, which can accurately describe the heat transfer characteristics of the battery cell.

[0099] In one embodiment, taking the fluid substance as air as an example, obtaining the property parameters of the fluid substance includes obtaining the specific heat capacity, thermal property density and thermal conductivity of the air.

[0100] In this embodiment, it is assumed that all the fluid in the thermostat is air except for the battery cells, that is, the fluid material is air. Therefore, the specific heat capacity, thermal property density and thermal conductivity of the air can be directly obtained as the property parameters of the fluid material, thereby accurately simulating the temperature change when the thermostat is filled with air.

[0101] In one embodiment, taking the material of the boundary component as steel material as an example, obtaining the attribute parameters of the boundary component includes: obtaining the specific heat capacity, thermal property density and thermal conductivity of the steel material.

[0102] Specifically, the material of the actual boundary component of the thermostat can be flexibly processed. For example, the specific heat capacity, thermal property density and thermal conductivity of other materials such as aluminum, glass, stainless steel, etc. can also be obtained. In this embodiment, the actual boundary component of the thermostat is steel material as an example, which can accurately simulate the influence of steel material on the temperature change of the thermostat.

[0103] It can be understood that the charge and discharge test data is a key parameter for evaluating the performance of the battery cell. In this embodiment, the heat generation problem of the battery cell is studied, so the charge and discharge test data in this embodiment may refer to data related to temperature. In one embodiment, the charge and discharge test data includes the adiabatic temperature rise curve, calorific value curve, heating power, voltage curve, and multi-point temperature curve of the battery cell as an example. Obtaining the charge and discharge test data associated with the temperature of the battery cell includes: performing a charge and discharge test on the battery cell under adiabatic conditions through an ARC adiabatic accelerating calorimeter to obtain the adiabatic temperature rise curve, calorific value curve, heating power, voltage curve, and multi-point temperature curve of the battery cell respectively.

[0104] Specifically, other environmental conditions (such as voltage) or battery cell test points for charge and discharge tests can be set. Exemplarily, the ARC adiabatic accelerating calorimeter is used to carry out battery charge and discharge tests under adiabatic conditions of the battery cell, and the operating condition is 0.5P constant power charge and discharge. Through this test, the battery adiabatic temperature rise curve, calorific value curve, heating power, voltage curve, and multi-point temperature curve can be obtained. The temperature test locations are the center of the large surface of the battery, the positive and negative poles, the side of the battery, and the bottom of the battery. During the charging process, the operating condition duration is Δt=t1min, the starting temperature is T0℃, the maximum temperature is Tf℃, and the adiabatic temperature rise is ΔT=Tf-T0 according to , we can calculate that the heat generated by the battery during the whole process of 0.5P charging @25ºC is Qh kJ. According to P=Q / △t, we can calculate the average heat generation power P of the whole process of 0.5P charging @25ºC. The heat generation power that varies with time can be obtained.

[0105] In this embodiment, since the ARC adiabatic accelerating calorimeter is a thermal analysis instrument designed based on the adiabatic principle, it can provide a precisely controlled adiabatic environment, simulate the thermal characteristics of the exothermic reaction process when the heat inside the battery has no time to dissipate, and understand the actual working conditions of the battery. Therefore, by performing charge and discharge tests on the battery cell under adiabatic conditions using the ARC adiabatic accelerating calorimeter, a more accurate adiabatic temperature rise curve, calorific value curve, heating power, voltage curve, and multi-point temperature curve of the battery cell can be obtained, thereby fully reflecting the heat generation of the battery cell.

[0106] In addition, according to different structures of the thermostat, the states of the solid components and fluid substances in the thermostat can be set when configuring the boundary conditions corresponding to the thermostat. In one embodiment, taking the thermostat including an air inlet, a fan and a fluid substance as an example, configuring the boundary conditions corresponding to the thermostat includes: respectively configuring the flow rate of the air inlet, the heat exchange power of the fan, the initial temperature of the thermostat, and the heat transfer coupling variables between the fluid substance and the solid in the thermostat.

[0107] The initial temperature of the thermostat and the heat transfer coupling variables between the fluid and the solid in the thermostat refer to the physical quantities that jointly affect the heat transfer process when the fluid and the solid in the thermostat interact with each other, including but not limited to temperature, heat flux density, thermal resistance, convection coefficient, thermal conductivity, ambient temperature, and ambient humidity.

[0108] It is understood that boundary conditions refer to specific values ​​or relationships set for variables or their derivatives on the system boundary in mathematical and physical problems. These conditions are indispensable in solving practical problems because they can ensure the uniqueness and existence of solutions. The simulation model mainly performs simulation operations through differential equations. Therefore, in this embodiment, the flow rate of the air inlet, the heat exchange power of the fan, the initial temperature of the thermostat, and the heat transfer coupling variables between the fluid material and the solid in the thermostat can improve the accuracy of the simulation model and enhance the calculation stability.

[0109] In one embodiment, the thermostat includes an air inlet and a fan. Figure 4 , attached Figure 4 A schematic diagram of the process of constructing a simulation model according to the charge and discharge test data, the thermal balance equations of the battery cells and the thermostat, the geometric entity domains of the battery cells and the thermostat, and the boundary conditions in this embodiment is shown; in this embodiment, constructing a simulation model according to the charge and discharge test data, the thermal balance equations of the battery cells and the thermostat, the geometric entity domains of the battery cells and the thermostat, and the boundary conditions includes the following steps S401~S403.

[0110] Step 401 , meshing and mesh processing are performed on the geometric entity domains of the battery cell and the constant temperature box.

[0111] It is understandable that mesh processing is a key step in numerical simulation. Usually mesh processing includes mesh refinement (encryption), mesh smoothing, mesh reconstruction, mesh type transformation and boundary layer mesh processing, etc., mainly to improve the accuracy, efficiency and stability of simulation model simulation.

[0112] Step 402, configuring a fluid substance in a geometric entity domain of a thermostatic box.

[0113] The fluid substance corresponds to the gas substance conventionally filled in the constant temperature box, for example, it can be a dry gas such as air, an insulating gas such as sulfur hexafluoride, but is not limited thereto.

[0114] Step 403, constructing a simulation model based on the fluid material, the geometric entity domain of the battery cell, the charge and discharge test data, the thermal balance equation of the battery cell and the constant temperature box, and the boundary conditions.

[0115] In this embodiment, the simulation model is constructed only based on the fluid material, the geometric entity domain of the battery cell, the charge and discharge test data, the thermal balance equations of the battery cell and the constant temperature box, and the boundary conditions. This can accurately simulate the battery cell charge and discharge test process while reducing the amount of simulation calculations performed by the simulation model, thereby obtaining accurate temperature change simulation results.

[0116] In one embodiment, the geometric entity domains of the battery cell and the thermostat are meshed and meshed, including: encrypting the mesh corresponding to the geometric entity domain of the battery cell; and performing boundary layer mesh processing on the mesh corresponding to the geometric entity domain of the air inlet in the thermostat and the mesh corresponding to the geometric entity domain of the fan in the thermostat.

[0117] Among them, the grid corresponding to the geometric entity domain of the battery cell is encrypted, that is, the grid corresponding to the geometric entity domain of the battery cell is refined, so as to increase the number of grids in the geometric entity domain of the battery cell. Therefore, when simulating the temperature change of the battery cell, it has higher accuracy and can obtain more accurate temperature simulation results.

[0118] The boundary layer refers to a thin layer with a large velocity gradient formed on the surface due to the viscosity of the fluid when the fluid flows over the solid surface. The physical properties of this layer directly affect the behavior and performance of the entire flow. In the boundary layer, the velocity of the fluid material gradually transitions from the static state on the surface to the free flow state not affected by viscosity. Depending on the flow conditions, the boundary layer may exhibit laminar or turbulent characteristics. Performing boundary layer mesh processing on the mesh corresponding to the geometric entity domain of the air inlet in the thermostat and the mesh corresponding to the geometric entity domain of the fan in the thermostat refers to effectively checking and evaluating the quality of the boundary layer (the mesh corresponding to the geometric entity domain of the air inlet and the geometric entity domain of the fan), such as evaluating the smoothness, orthogonality and regularity of the boundary layer (the mesh corresponding to the geometric entity domain of the air inlet and the geometric entity domain of the fan). Based on the results of the mesh quality evaluation, it may be necessary to adjust and optimize the boundary layer (the mesh corresponding to the geometric entity domain of the air inlet and the geometric entity domain of the fan) to ensure that high-quality mesh standards can be maintained throughout the simulation process and ensure the accuracy of the temperature simulation results.

[0119] In one embodiment, the simulation model includes a plurality of battery cells; the temperature change simulation results include the battery cell temperature change simulation results and the ambient temperature change simulation results of the thermostat; see the attached Figure 5 , attached Figure 5 A schematic flow chart of obtaining the simulation results of temperature changes of the simulation model during the charge and discharge test of the battery cell is shown. The process of obtaining the simulation results of temperature changes of the simulation model during the charge and discharge test of the battery cell includes the following steps S501 to S502.

[0120] Step S501, placing the geometric entity domains of multiple battery cells according to preset positions; the preset position placement includes at least one of horizontally aligning the geometric entity domains of multiple battery cells, vertically aligning the geometric entity domains of multiple battery cells, and staggered arranging the geometric entity domains of multiple battery cells.

[0121] Step S502 , performing charge and discharge tests on the geometric entity domains of the plurality of battery cells placed at preset positions simultaneously to obtain corresponding battery cell temperature change simulation results and thermostat ambient temperature change simulation results respectively.

[0122] See attached Figure 6 and attached Figure 7 , attached Figure 6 The temperature change curve of the battery cell when the battery cell is placed in different positions for charge and discharge test, where S means multiple battery cells are placed horizontally and C means staggered placement; Figure 6 It can be seen that placing the geometric entity domain of the battery cell in different positions for charge and discharge tests has almost no effect on the temperature of the battery cell. Figure 7The figure is the temperature change curve of the constant temperature box when the geometric entity domain of the battery cell is placed in different positions for charge and discharge test. The dotted line indicates that the battery cell is placed in vertical alignment, that is, placed in the same vertical direction. Figure 7 It can be seen that the geometric entity domain of the battery cell is placed in different positions for charge and discharge testing, which has little impact on the ambient temperature of the constant temperature box.

[0123] In this embodiment, the charge and discharge tests are performed on multiple cells placed in preset positions at the same time to obtain the corresponding cell temperature change simulation results and the ambient temperature change simulation results of the constant temperature box, which can conveniently and quickly explore the changes in ambient temperature during the battery charging and discharging process, and can also explore the impact of different cell placement positions on ambient temperature and the changes in the temperature of the cell itself. In addition, through simulation model simulation, the flow path of the simulated fluid material can also be clearly simulated. See the attached Figure 8 and attached Fig. 9 , attached Figure 8 This is a schematic diagram of the temperature distribution in the constant temperature box simulated by the simulation model when the geometric entity domains of multiple battery cells are aligned horizontally. Fig. 9 Schematic diagram of the temperature distribution in the constant temperature box simulated by the simulation model when the geometric entities of multiple battery cells are horizontally staggered.

[0124] In one embodiment, see the attached Fig.10 , attached Fig.10 The second flow chart of the method for simulating the temperature change of the thermostat in this embodiment is shown. The method in this embodiment includes the following steps S1001 to S1012.

[0125] Step S1001, performing a charge and discharge test on the battery cell under adiabatic conditions by using an ARC adiabatic accelerating calorimeter to obtain the adiabatic temperature rise curve, calorific value curve, heating power, voltage curve, and multi-point temperature curve of the battery cell.

[0126] Step S1002, respectively obtain the specific heat capacity, thermal property density, thermal conductivity of the battery cell in the x, y, and z directions, the specific heat capacity, thermal property density, and thermal conductivity of air, and the specific heat capacity, thermal property density, and thermal conductivity of steel.

[0127] Step S1003, constructing a first heat balance equation according to the property parameters of the battery cell and the heat absorbed by the thermostat; constructing a second heat balance equation according to the property parameters of the boundary components in the thermostat and the heat absorbed by the thermostat; constructing a third heat balance equation according to the property parameters of the fluid substance and the heat absorbed by the thermostat; constructing a fourth heat balance equation according to the property parameters of the fluid substance, the fluid pressure of the thermostat and the gravitational acceleration.

[0128] Step S1004: constructing geometric entity domains of the battery cell and the thermostat according to actual sizes of the battery cell and the thermostat.

[0129] Step S1005, respectively configure the flow rate of the air inlet, the heat exchange power of the fan, the initial temperature of the thermostat, and the heat transfer coupling variables between the fluid material and the solid in the thermostat.

[0130] Step S1006, encrypting the mesh corresponding to the geometric entity domain of the battery cell; performing boundary layer mesh processing on the mesh corresponding to the geometric entity domain of the air inlet in the thermostat and the mesh corresponding to the geometric entity domain of the fan in the thermostat.

[0131] Step S1007, configuring air in the geometric entity domain of the constant temperature box.

[0132] Step S1008, constructing a simulation model based on the fluid material, the geometric entity domain of the battery cell, the charge and discharge test data, the thermal balance equation of the battery cell and the constant temperature box, and the boundary conditions.

[0133] Step S1009, placing the geometric entity domains of the multiple battery cells according to preset positions; the preset position placement includes at least one of horizontally aligning the geometric entity domains of the multiple battery cells, vertically aligning the geometric entity domains of the multiple battery cells, and staggeredly arranging the geometric entity domains of the multiple battery cells.

[0134] Step S1010 , performing charge and discharge tests on the geometric entity domains of the plurality of battery cells placed at preset positions simultaneously to obtain corresponding battery cell temperature change simulation results and constant temperature box ambient temperature change simulation results respectively.

[0135] In this embodiment, the actual size of the battery cell and the thermostat, the charge and discharge test data, the heat balance equations describing solid heat transfer, fluid material heat transfer, fluid material and pressure, and multiple boundary conditions are introduced when constructing the simulation model, so that the actual thermostat can be accurately simulated, and the charge and discharge test data introduced when constructing the simulation model, and the input parameters of multiple battery cells in the simulation model are completely consistent, so that the temperature change simulation results obtained according to the simulation model can eliminate the differences caused by the consistency of the battery cell itself, and the reasons for the changes in the ambient temperature of the thermostat can be more accurately evaluated according to the final temperature change simulation results. In addition, it is also possible to explore the impact of different placement positions of the battery cell on the ambient temperature and the changes in the temperature of the battery cell itself. Through simulation modeling, the flow path of the simulated fluid material can be clearly simulated, and the visualization of the temperature change simulation results can be improved.

[0136] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0137] Based on the same inventive concept, the embodiment of the present application also provides a thermostat temperature change simulation device for implementing the thermostat temperature change simulation method involved above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations in one or more thermostat temperature change simulation device embodiments provided below can refer to the limitations of the thermostat temperature change simulation method above, and will not be repeated here.

[0138] In one embodiment, Fig.11 As shown, a structural block diagram of a thermostat temperature change simulation device 1100 is provided. The thermostat temperature change simulation device 1100 in this embodiment includes: a test module 1101, an equation construction module 1102, a geometric entity domain construction module 1103, a condition configuration module 1104, a model construction module 1105 and a simulation module 1106. The test module 1101 is used to obtain the charge and discharge test data associated with the battery cell and the temperature; the equation construction module 1102 is used to construct the thermal balance equation of the battery cell and the thermostat; the geometric entity domain construction module 1103 is used to construct the geometric entity domain of the battery cell and the thermostat according to the actual size of the battery cell and the thermostat; the condition configuration module 1104 is used to configure the boundary conditions corresponding to the thermostat; the model construction module 1105 is used to construct a simulation model according to the charge and discharge test data, the thermal balance equation of the battery cell and the thermostat, the geometric entity domain of the battery cell and the thermostat and the boundary conditions; the simulation module 1106 is used to obtain the temperature change simulation result of the simulation model during the charge and discharge test of the battery cell.

[0139] In one embodiment, the equation construction module is also used to respectively obtain the property parameters of the battery cell, the fluid material in the thermostat and the boundary components in the thermostat; construct a first heat balance equation according to the property parameters of the battery cell and the heat absorbed by the thermostat; construct a second heat balance equation according to the property parameters of the boundary components in the thermostat and the heat absorbed by the thermostat; construct a third heat balance equation according to the property parameters of the fluid material and the heat absorbed by the thermostat; and construct a fourth heat balance equation according to the property parameters of the fluid material, the fluid pressure of the thermostat and the gravitational acceleration.

[0140] In one embodiment, the property parameters include thermal property density, specific heat capacity, and thermal conductivity; the equation construction module is also used to obtain the specific heat capacity, thermal property density of the battery cell and the thermal conductivity of the battery cell in the x, y, and z directions respectively.

[0141] In one embodiment, the property parameters include thermal property density, specific heat capacity, and thermal conductivity; the equation building module is also used to obtain the specific heat capacity, thermal property density, and thermal conductivity of air.

[0142] In one embodiment, the property parameters include thermal property density, specific heat capacity, and thermal conductivity; the equation building module is also used to obtain the specific heat capacity, thermal property density, and thermal conductivity of the steel material.

[0143] In one embodiment, the charge and discharge test data include the adiabatic temperature rise curve, calorific value curve, heating power, voltage curve, and multi-point temperature curve of the battery cell; the test module is also used to perform charge and discharge tests on the battery cell under adiabatic conditions through an ARC adiabatic accelerating calorimeter to obtain the adiabatic temperature rise curve, calorific value curve, heating power, voltage curve, and multi-point temperature curve of the battery cell respectively.

[0144] In one embodiment, the thermostat includes an air inlet, a fan and a fluid substance; the condition configuration module is also used to respectively configure the flow rate of the air inlet in the thermostat, the heat exchange power of the fan in the thermostat, the initial temperature of the thermostat and the heat transfer coupling variables between the fluid substance and the thermostat.

[0145] In one embodiment, the model building module is also used to mesh and process the geometric entity domains of the battery cell and the constant temperature box; configure fluid material in the geometric entity domain of the constant temperature box; and build a simulation model based on the fluid material, the geometric entity domain of the battery cell, the charge and discharge test data, the thermal balance equations of the battery cell and the constant temperature box, and the boundary conditions.

[0146] In one embodiment, the model building module is also used to encrypt the mesh corresponding to the geometric entity domain of the battery cell; and perform boundary layer mesh processing on the mesh corresponding to the geometric entity domain of the air inlet in the constant temperature box and the mesh corresponding to the geometric entity domain of the fan in the constant temperature box.

[0147] In one embodiment, the simulation model includes multiple battery cells; the temperature change simulation results include battery cell temperature change simulation results and ambient temperature change simulation results of the constant temperature box; the simulation module is also used to place the geometric entity domains of the multiple battery cells according to preset positions; the preset position placement includes at least one of horizontally aligned geometric entity domains of the multiple battery cells, vertically aligned geometric entity domains of the multiple battery cells, and staggered geometric entity domains of the multiple battery cells; the geometric entity domains of the multiple battery cells placed according to the preset positions are simultaneously charged and discharged to obtain corresponding battery cell temperature change simulation results and ambient temperature change simulation results of the constant temperature box, respectively.

[0148] Each module in the above-mentioned thermostat temperature change simulation device can be implemented in whole or in part by software, hardware and their combination. Each of the above-mentioned modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory in the computer device in the form of software, so that the processor can call and execute the corresponding operations of each of the above modules.

[0149] In an exemplary embodiment, a computer device is provided. The computer device may be a terminal, and its internal structure diagram may be as shown in FIG. Fig.12As shown. The computer device includes a processor, a memory, an input / output interface, a communication interface, a display unit and an input device. The processor, the memory and the input / output interface are connected through a system bus, and the communication interface, the display unit and the input device are connected to the system bus through the input / output interface. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The input / output interface of the computer device is used to exchange information between the processor and the external device. The communication interface of the computer device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be realized through WIFI, a mobile cellular network, near field communication (NFC) or other technologies. When the computer program is executed by the processor, a method for simulating temperature changes in a constant temperature box is realized. The display unit of the computer device is used to form a visually visible picture, which can be a display screen, a projection device or a virtual reality imaging device. The display screen can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device can be a touch layer covering the display screen, or a button, trackball or touchpad set on the computer device shell, or an external keyboard, touchpad or mouse.

[0150] Those skilled in the art will understand that Fig.12 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0151] In an exemplary embodiment, a computer device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the steps in the above-mentioned method embodiments when executing the computer program.

[0152] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps in the above-mentioned method embodiments are implemented.

[0153] In one embodiment, a computer program product is provided, including a computer program, which implements the steps in the above method embodiments when executed by a processor.

[0154] A person of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment method can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, an artificial intelligence (AI) processor, etc., but are not limited to this.

[0155] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above 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 application.

[0156] The above-described 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 present application. 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 present application shall be subject to the attached claims.

Claims

1. A method for simulating temperature change of a thermostat, characterized in that: include: Obtain the charge and discharge test data related to the battery cell and temperature; Constructing a thermal balance equation for the battery cell and the thermostat; Constructing the geometric entity domains of the battery cell and the thermostat according to the actual sizes of the battery cell and the thermostat; Configure the boundary conditions corresponding to the thermostat; Constructing a simulation model according to the charge and discharge test data, the thermal balance equation of the battery cell and the thermostat, the geometric entity domains of the battery cell and the thermostat, and the boundary conditions; The temperature change simulation result of the simulation model during the charge and discharge test of the battery cell is obtained.

2. The method according to claim 1, characterized in that The heat balance equation for constructing the battery cell and the thermostat box includes: Respectively obtaining property parameters of the battery core, the fluid material in the thermostat, and the boundary components in the thermostat; Constructing a first heat balance equation according to the property parameters of the battery cell and the heat absorbed by the thermostat; constructing a second heat balance equation according to the property parameters of the boundary components in the thermostatic box and the heat absorbed by the thermostatic box; Constructing a third heat balance equation according to the property parameters of the fluid substance and the heat absorbed by the thermostat; A fourth heat balance equation is constructed according to the property parameters of the fluid substance, the fluid pressure of the thermostat and the gravitational acceleration.

3. The method according to claim 2, characterized in that The property parameters include thermal property density, specific heat capacity, and thermal conductivity; obtaining the property parameters of the battery cell includes: The specific heat capacity, thermal property density and thermal conductivity of the battery cell in the x, y and z directions are obtained respectively.

4. The method according to claim 2, characterized in that: The property parameters include thermal property density, specific heat capacity, and thermal conductivity; Obtaining the property parameters of the fluid substance includes: Get the specific heat capacity, thermal property density, and thermal conductivity of air.

5. The method according to claim 2, characterized in that: The attribute parameters include thermal attribute density, specific heat capacity, and thermal conductivity; obtaining the attribute parameters of the boundary components in the constant temperature box includes: Get the specific heat capacity, thermal property density, and thermal conductivity of the Steel material.

6. The method according to claim 1, characterized in that The charge and discharge test data includes the adiabatic temperature rise curve, calorific value curve, heating power, voltage curve, and multi-point temperature curve of the battery cell; the acquisition of the charge and discharge test data associated with the battery cell and temperature includes: The battery cell is subjected to a charge and discharge test under adiabatic conditions by using an ARC adiabatic accelerating calorimeter to obtain the adiabatic temperature rise curve, calorific value curve, heating power, voltage curve, and multi-point temperature curve of the battery cell.

7. The method according to claim 1, characterized in that The configuration and the boundary conditions corresponding to the constant temperature box include: The flow rate of the air inlet in the thermostat, the heat exchange power of the fan in the thermostat, the initial temperature of the thermostat and the heat transfer coupling variables between the fluid substance and the thermostat are configured respectively.

8. The method according to claim 1, characterized in that A simulation model is constructed according to the charge and discharge test data, the thermal balance equation of the battery cell and the thermostat, the geometric entity domain of the battery cell and the thermostat, and the boundary conditions, including: Performing mesh division and mesh processing on the geometric entity domains of the battery cell and the constant temperature box; Disposing a fluid substance in the geometric entity domain of the thermostatic box; A simulation model is constructed according to the fluid substance, the geometric entity domain of the battery cell, the charge and discharge test data, the thermal balance equation of the battery cell and the thermostat, and the boundary conditions.

9. The method according to claim 8, characterized in that Meshing and mesh processing are performed on the geometric entity domains of the battery cell and the constant temperature box, including: Encrypting the mesh corresponding to the geometric entity domain of the battery cell; Boundary layer mesh processing is performed on meshes corresponding to the geometric entity domain of the air inlet in the thermostatic box and meshes corresponding to the geometric entity domain of the fan in the thermostatic box respectively.

10. The method according to claim 1, characterized in that The temperature change simulation result includes the battery core temperature change simulation result and the ambient temperature change simulation result of the thermostat; The obtaining of the simulation result of the temperature change of the simulation model during the charge and discharge test of the battery cell includes: Placing the geometric entity domains of the plurality of battery cells at a preset position; the preset position placement includes at least one of horizontally aligning the geometric entity domains of the plurality of battery cells, vertically aligning the geometric entity domains of the plurality of battery cells, and staggered arranging the geometric entity domains of the plurality of battery cells; The geometric entity domains of the plurality of battery cells placed at the preset positions are simultaneously subjected to charge and discharge tests to respectively obtain corresponding battery cell temperature change simulation results and ambient temperature change simulation results of the constant temperature box.

11. A thermostat temperature change simulation device, characterized in that: The thermostat temperature change simulation device comprises: A test module is used to obtain charge and discharge test data associated with the battery cell and temperature; An equation building module, used to build a thermal balance equation for the battery cell and the thermostat; A geometric entity domain construction module, used to construct the geometric entity domains of the battery cell and the thermostat according to the actual sizes of the battery cell and the thermostat; A condition configuration module, used to configure boundary conditions corresponding to the constant temperature box; A model building module, used for building a simulation model according to the charge and discharge test data, the thermal balance equation of the battery cell and the thermostat, the geometric entity domains of the battery cell and the thermostat, and the boundary conditions; The simulation module is used to obtain the temperature change simulation result of the simulation model during the charge and discharge test of the battery cell.

12. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 10 are implemented.

13. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 10 are implemented.

14. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 10 are implemented.

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