A method, system, storage medium, and device for calculating the thermal resistance of a battery pack.

Abstract

This invention provides a method for calculating the thermal resistance of a battery pack, a system storage medium, and a device. The method includes: acquiring relevant parameters of each component of the battery pack and building a model of the battery pack; setting the heat input and heat output terminals of each component of the battery pack according to the battery pack model; acquiring the preset total heat dissipation power of the battery pack and performing a three-dimensional thermal steady-state simulation calculation on the battery pack model; then acquiring the temperature parameters of the heat input and heat output terminals of each component of the battery pack and the total heat dissipation power of the battery pack at the preset time; obtaining the average temperature of the heat input and heat output terminals according to the temperature parameters through preset rules; dividing the difference between the average temperature of the heat output terminal and the average temperature of the heat input and heat output terminals by the total heat dissipation power to obtain the thermal resistance of each component of the battery pack; and summing all thermal resistances to obtain the total thermal resistance of the battery pack. This invention solves the problem that traditional thermal resistance calculation methods in the prior art can lead to large deviations and easily cause errors in thermal resistance control.

Description

Technical Field

[0001] This invention relates to the field of battery pack applications, and particularly to a method, system, storage medium, and device for calculating the thermal resistance of a battery pack. Background Technology

[0002] New energy vehicles refer to automobiles that use unconventional vehicle fuels as their power source (or use conventional vehicle fuels but employ new onboard power devices), integrating advanced technologies in vehicle power control and drive, resulting in vehicles with advanced technical principles and new technologies and structures. New energy vehicles include pure electric vehicles, range-extended electric vehicles, hybrid electric vehicles, fuel cell electric vehicles, and hydrogen engine vehicles.

[0003] Currently, the heat dissipation structure of new energy vehicle battery packs generally consists of battery cells (modules), insulating pads, thermally conductive silicone, water channel flat tubes, and coolant connected in series. The mainstream electric vehicle battery packs actively dissipate heat through the coolant. The heat transfer path is as follows: the heat generated by the battery cell is conducted to the bottom surface of the cell, then to the thin insulating layer, then to the thermally conductive silicone, then to the thin-walled metal flat tubes, and finally to the coolant. To ensure efficient heat dissipation from the battery cells by the coolant, thermal resistance control is required along each heat transfer path. Traditional methods for quantifying the thermal resistance of each path are based on one-dimensional heat transfer theory: the thermal resistance formula for heat conduction. To calculate, where The thickness (m) is the thickness along the one-dimensional heat conduction direction. The value represents the thermal conductivity of the solid (w / km). The heat transfer contact surface area is (m^2); the convective heat transfer thermal resistance is... ,in The heat convection exchange coefficient (w / km^2) is given, and the total thermal resistance is directly added together in series. .

[0004] However, in actual engineering, heat transfer along each path in a battery pack is three-dimensional, although only one direction is the primary direction. Furthermore, the modules within the battery pack act as heat sources (self-generating), which deviates from the scope of the one-dimensional thermal resistance formula. Additionally, the calculation of the convective heat transfer resistance corresponding to the coolant wall involves the magnitude of the convective heat transfer coefficient, a parameter that cannot be accurately assessed, thus making accurate calculation of convective thermal resistance impossible. Therefore, using traditional thermal resistance calculation methods can lead to significant deviations and easily cause errors in thermal resistance control. Summary of the Invention

[0005] Based on this, the purpose of the present invention is to provide a method, system, storage medium and device for calculating the thermal resistance of a battery pack, which aims to solve the problem that traditional thermal resistance calculation methods in the prior art can lead to large deviations and easily cause errors in thermal resistance control.

[0006] A method for calculating the thermal resistance of a battery pack according to an embodiment of the present invention includes:

[0007] Obtain relevant parameters of each component of the battery pack, and build a model of the battery pack based on the relevant parameters. Each component of the battery pack includes a module, an insulating layer, thermally conductive silicone, a flat tube, and a coolant pipeline.

[0008] The heat input and heat output terminals of each component of the battery pack are set according to the model of the battery pack;

[0009] Obtain the preset total heat generation power of the battery pack, and perform three-dimensional thermal steady-state simulation calculation on the model of the battery pack based on the preset total heat generation power;

[0010] When obtaining the three-dimensional thermal steady-state simulation calculation, the temperature parameters of the heat input end and the heat output end of each component of the battery pack, as well as the total heat dissipation power of the battery pack;

[0011] The average temperature of the heat input terminal and the heat output terminal is obtained by means of a preset rule based on the temperature parameters of the heat input terminal and the heat output terminal.

[0012] The thermal resistance of each component of the battery pack is obtained by dividing the difference between the average temperature of the heat output end and the average temperature of the heat input end of each component by the total heat dissipation power.

[0013] The total thermal resistance of the battery pack is obtained by summing the thermal resistances of each component.

[0014] In addition, the method for calculating the thermal resistance of a battery pack according to the above embodiments of the present invention may also have the following additional technical features:

[0015] Furthermore, the relevant parameters include at least the spatial parameters, dimensional parameters, and property parameters of the module, insulating layer, thermally conductive silicone, coolant piping, and coolant.

[0016] Furthermore, the step of obtaining relevant parameters of each component of the battery pack and building a model of the battery pack based on the relevant parameters, wherein each component of the battery pack includes modules, insulating layers, thermally conductive silicone, flat tubes, and coolant pipelines, includes:

[0017] Obtain the relevant parameters, which include the three-dimensional model data of each component of the battery pack;

[0018] The 3D model data is classified according to the material of the parts to generate corresponding 3D model part families;

[0019] According to a preset order, each part is extracted from the three-dimensional model part family and placed in a predetermined spatial position to obtain the three-dimensional model of each component of the battery pack.

[0020] Based on the relevant parameters, the three-dimensional models of the various components of the battery pack are spatially connected to form the three-dimensional model of the battery pack.

[0021] Furthermore, the heat input end of the module is the entire module, and the heat output end is the bottom surface of the module;

[0022] The heat input end of the insulating layer is the upper surface of the insulating layer, and the heat output end is the bottom surface of the insulating layer;

[0023] The heat input end of the thermally conductive silicone is the upper surface of the thermally conductive silicone, and the heat output end is the bottom surface of the thermally conductive silicone;

[0024] The heat input end of the flat tube is the upper end face of the flat tube, and the heat output end is the inner surface of the tube opening that contacts the coolant pipeline.

[0025] The heat input end of the coolant pipeline is the outer surface of the coolant pipeline that contacts the flat tube, and the heat output end is the entire coolant inside the coolant pipeline.

[0026] Furthermore, the step of spatially connecting the three-dimensional models of the relevant components of the battery pack according to the relevant parameters to form a three-dimensional model of the battery pack includes:

[0027] The attribute parameters are obtained and assigned to the corresponding three-dimensional models of each component of the battery pack. The attribute parameters include at least material parameters and thermal performance parameters.

[0028] Further, after the step of summing the thermal resistances of each component of the battery pack to obtain the thermal resistance of the battery pack, the following steps are included:

[0029] Obtain the second preset total heat generation power of the battery pack;

[0030] Based on the second preset total heating power, repeat the above steps to obtain the second thermal resistance of each component of the battery pack and the second total thermal resistance of the battery pack;

[0031] The thermal resistance of each component of the battery pack is compared with the second thermal resistance, and the total thermal resistance of the battery pack is compared with the second total thermal resistance.

[0032] The thermal resistance calculation was verified by comparing the results.

[0033] Furthermore, the properties of the coolant include at least density, thermal conductivity, specific heat capacity, inlet flow rate, and inlet temperature.

[0034] Another object of the present invention is to provide a thermal resistance calculation system for a battery pack, the system comprising:

[0035] The modeling module is used to obtain relevant parameters of each component of the battery pack and build a model of the battery pack based on the relevant parameters. Each component of the battery pack includes a module, an insulating layer, thermally conductive silicone, a flat tube, and a coolant pipeline.

[0036] The definition module is used to set the heat input and heat output terminals of each component of the battery pack according to the model of the battery pack;

[0037] The simulation module is used to obtain the preset total heat generation power of the battery pack and perform three-dimensional thermal steady-state simulation calculations on the model of the battery pack based on the preset total heat generation power.

[0038] The acquisition module is used to acquire the temperature parameters of the heat input and heat output terminals of each component of the battery pack, as well as the total heat dissipation power of the battery pack, during the three-dimensional thermal steady-state simulation calculation.

[0039] An average temperature calculation module is used to obtain the average temperature of the heat input terminal and the heat output terminal according to the temperature parameters of the heat input terminal and the heat output terminal through a preset rule;

[0040] The thermal resistance calculation module is used to divide the difference between the average temperature of the heat output end and the average temperature of the heat input end of each component of the battery pack by the total heat dissipation power to obtain the thermal resistance of each component of the battery pack.

[0041] The total thermal resistance calculation module sums the thermal resistances of each component of the battery pack to obtain the total thermal resistance of the battery pack.

[0042] Another objective of this invention is to provide a storage medium storing a computer program that, when executed by a processor, implements the steps of the above-described method for calculating the thermal resistance of a battery pack.

[0043] Another object of this invention is to provide a device including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the steps of the above-described method for calculating the thermal resistance of a battery pack.

[0044] This invention establishes a three-dimensional model of the battery pack, sets a preset total heat dissipation power, and defines the heat input and output terminals of each component. Based on the preset total heat dissipation power, a three-dimensional thermal steady-state simulation is performed to obtain the temperature parameters of the heat input and output terminals of each component, as well as the total heat dissipation power of the battery pack. These temperature parameters are processed to obtain the average temperature of the heat input and output terminals. The difference between the average temperatures of the heat input and output terminals of each component is then divided by the total heat dissipation power to obtain the thermal resistance of each component. The sum of the thermal resistances of each component yields the total thermal resistance of the battery pack. Compared to existing technologies, this method considers the three-dimensional heat transfer effect, defining the heat inflow and outflow faces of each path, and calculating the thermal resistance of the path using the temperature difference and heat flow rate at both ends. This avoids the inherent limitations of one-dimensional calculation methods and eliminates the problem of selecting the contact area size. If the inlet and outlet areas of the heat flow in each path are inconsistent, the specific contact area A in the one-dimensional calculation formula is arbitrary. However, the calculation method of this invention is independent of the inconsistent areas, focusing only on the temperature difference between the ends. And it avoids selecting the convective heat transfer coefficient, instead indirectly feeding it back to the end-face temperature difference parameter. Attached Figure Description

[0045] Figure 1 This is a flowchart of the method for calculating the thermal resistance of a battery pack in the first embodiment of the present invention;

[0046] Figure 2 This is a schematic diagram of the result of the secure communication system in the third embodiment of the present invention;

[0047] Figure 3 This is a schematic diagram of the device in the fourth embodiment of the present invention;

[0048] Figure 4 This is a schematic diagram of the battery pack structure in the first embodiment of the present invention. From top to bottom, the components are a module, an insulating layer, a thermally conductive silicone, a flat tube, and a coolant pipeline.

[0049] The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation

[0050] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Several embodiments of the invention are illustrated in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

[0051] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0052] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0053] Example 1

[0054] Please see Figure 1 The figure shows a method for calculating the thermal resistance of a battery pack in the first embodiment of the present invention, which specifically includes steps S11-S17.

[0055] Step S11: Obtain relevant parameters of each component of the battery pack, and build a model of the battery pack based on the relevant parameters. Each component of the battery pack includes a module, an insulating layer, thermally conductive silicone, a flat tube, and a coolant pipeline.

[0056] It should be noted that the relevant parameters include the spatial parameters, dimensional parameters, and property parameters of the module, insulating layer, thermally conductive silicone, coolant piping, and coolant. Among them, the property parameters include material parameters and thermal performance parameters, such as density, heat capacity, and thermal conductivity. The property parameters of the coolant include density, thermal conductivity, specific heat capacity, inlet flow rate, and inlet temperature.

[0057] In practice, after obtaining the relevant parameters, the parts are classified according to the material based on the attribute parameters and size parameters, and corresponding three-dimensional part families are generated. Then, each part is extracted from the three-dimensional model part families in a preset order and placed in a predetermined spatial position according to the spatial parameters to obtain the three-dimensional model of each component of the battery pack. Finally, the components of the battery pack are assembled in space according to the spatial parameters to obtain the three-dimensional model of the battery pack.

[0058] Step S12: Set the heat input and heat output terminals of each component of the battery pack according to the model of the battery pack;

[0059] In practical implementation, since the module is the heat source, and based on the direct connection relationships between the various components of the battery pack, the heat input and heat output ends of each component can be defined. Specifically, the heat input end of the module is the entire module, and the heat output end is the bottom surface of the module.

[0060] The heat input end of the insulating layer is the upper surface of the insulating layer, and the heat output end is the bottom surface of the insulating layer; the heat input end of the thermally conductive silicone is the upper surface of the thermally conductive silicone, and the heat output end is the bottom surface of the thermally conductive silicone; the heat input end of the flat tube is the upper surface of the flat tube, and the heat output end is the inner surface of the flat tube opening that contacts the coolant pipeline; the heat input end of the coolant pipeline is the outer surface of the coolant pipeline that contacts the flat tube, and the heat output end is the entire coolant inside the coolant pipeline.

[0061] Step S13: Obtain the preset total heat generation power of the battery pack, and perform a three-dimensional thermal steady-state simulation calculation on the model of the battery pack based on the preset total heat generation power;

[0062] Specifically, after the parameters of each component of the battery pack are set and the heat conduction path of each component of the battery pack is determined, a three-dimensional thermal steady-state simulation calculation is performed on the battery pack model based on the preset total heat generation power of the module. At this time, the model will reflect the heat transfer status, distribution status and temperature change of each component under the theoretical state.

[0063] Step S14: Obtain the temperature parameters of the heat input end and the heat output end of each component of the battery pack, as well as the total heat dissipation power of the battery pack during the three-dimensional thermal steady-state simulation calculation.

[0064] Specifically, when the battery pack model reaches thermal equilibrium in a thermal steady state, the temperature parameters of the heat input and output terminals of each component of the battery pack, as well as the total heat dissipation power of the battery pack, are collected. Since the battery pack model has reached thermal steady state at this point, the total heat dissipation power of the battery pack is equal to the preset total heat generation power of the module. In practice, different heat domains are generated based on the defined heat input and output terminals of each component of the battery pack. The temperature parameters of each heat domain are directly generated and exported based on the changes in temperature parameters during the three-dimensional thermal steady-state simulation.

[0065] Step S15: Obtain the average temperature of the heat input terminal and the heat output terminal according to the temperature parameters of the heat input terminal and the heat output terminal through a preset rule;

[0066] In practical implementation, depending on the division between the heat input end and the heat output end, the average temperature of each component of the battery pack is calculated as follows: Average temperature of the module's heat input end , It refers to the module volume; the average surface temperature of the module's heat output terminal. , It refers to the area of ​​the bottom surface of the module; the average temperature of the insulating heat input terminal. , It is the area of ​​the upper surface of the insulating pad; calculate the average temperature at the insulation heat output terminal. , It refers to the area of ​​the insulating base; the average temperature of the thermally conductive silicone heat input end. , It is the area of ​​the upper surface of the thermally conductive silicone; calculate the average temperature of the heat output end of the thermally conductive silicone. , It refers to the area of ​​the thermally conductive silicone base; the average temperature of the heat input end of the flat tube. , It is the area of ​​the upper end face of the flat tube; calculate the average surface temperature of the heat output end of the flat tube. , It is the area of ​​the inner surface of the flat tube's inlet that contacts the coolant piping; calculate the average surface temperature of the heat output end of the coolant piping. , Yes, the area; calculate the average temperature at the heat output end of the coolant piping. , It is the volume of coolant; For temperature.

[0067] Step S16: Divide the difference between the average temperature of the heat output terminal and the average temperature of the heat input terminal of each component of the battery pack by the total heat dissipation power to obtain the thermal resistance of each component of the battery pack.

[0068] Step S17: The total thermal resistance of the battery pack is obtained by summing the thermal resistances of each component of the battery pack.

[0069] In practical implementation, the total thermal resistance of the battery pack, after simplified calculation, can be determined as the difference between the average surface temperature of the module's heat output terminal and the average temperature of the coolant pipe's heat output terminal, divided by the total heat dissipation power. Therefore, when only the total thermal resistance of the battery pack is needed, it can be directly obtained without calculating and summing the thermal resistances of each component in the battery pack.

[0070] In summary, the battery pack thermal resistance calculation method in the above embodiments of the present invention establishes a three-dimensional model of the battery pack, sets a preset total heat generation power of the battery pack, and defines the heat input and heat output terminals of each component of the battery pack. Based on the preset total heat generation power, a three-dimensional thermal steady-state simulation is performed on the battery pack to obtain the temperature parameters of the heat input and heat output terminals of each component, as well as the total heat dissipation power of the battery pack. The temperature parameters are processed to obtain the average temperature of the heat input and heat output terminals. The difference between the average temperatures of the heat input and heat output terminals of each component is then divided by the total heat dissipation power to obtain the thermal resistance of each component. The sum of the thermal resistances of each component yields the total thermal resistance of the battery pack. Compared to existing technologies, this method considers the three-dimensional heat transfer effect, defines the heat inflow and outflow faces of each path, and calculates the thermal resistance of the path using the temperature difference and heat flow rate at both ends. This avoids the inherent limitations of one-dimensional calculation methods and avoids the problem of selecting the contact area size. If the inlet and outlet areas of the heat flow in each path are inconsistent, the specific value of the contact area A in the one-dimensional calculation formula is arbitrary. The calculation method of this invention is independent of the varying areas; only the end-face temperature difference needs to be considered. Furthermore, it avoids the need to select the convective heat transfer coefficient, instead indirectly feeding it back into the end-face temperature difference parameter.

[0071] Example 2

[0072] The second embodiment of the present invention also provides a method for calculating the thermal resistance of a battery pack. The difference between the method for calculating the thermal resistance of a battery pack in this embodiment and the method for calculating the thermal resistance of a battery pack in the first embodiment is as follows:

[0073] After the step of summing the thermal resistances of each component of the battery pack to obtain the thermal resistance of the battery pack, the following steps are included:

[0074] Obtain the second preset total heat generation power of the battery pack;

[0075] Based on the second preset total heating power, repeat the above steps to obtain the second thermal resistance of each component of the battery pack and the second total thermal resistance of the battery pack;

[0076] The thermal resistance of each component of the battery pack is compared with the second thermal resistance, and the total thermal resistance of the battery pack is compared with the second total thermal resistance.

[0077] The thermal resistance calculation was verified by comparing the results.

[0078] In other words, after calculating the thermal resistance of each component of the battery pack and the total thermal resistance of the battery pack in this embodiment, a new preset total heat generation power needs to be input. Based on this new preset heat generation power, the thermal resistance of each component of the battery pack and the total thermal resistance of the battery pack are recalculated while other parameters remain unchanged. The calculation results from both sides are compared. If the two calculation results are consistent, it indicates that the current calculation of this method is correct. If the two calculation results are inconsistent, the cause of the error needs to be investigated. Common errors are mostly due to problems in the definition of the heat input and heat output ends, leading to problems in obtaining temperature parameters. Furthermore, to further ensure the accuracy of this method, several different sets of total heat generation power for the battery pack can be preset, and multiple calculations can be performed for comparison to ensure the consistency and accuracy of the thermal resistance calculation results.

[0079] It should be noted that the above embodiments and their features can be freely combined without conflict. Therefore, this invention defines the heat inflow and outflow faces of each heat transfer path, and then uses three-dimensional thermal simulation to extract and process temperature data at the heat inflow and outflow ends of each heat transfer path. This data is then combined with heat dissipation power data for post-processing calculations to obtain the thermal resistance of each node on each path. The thermal resistance calculated by this method reflects the actual macroscopic thermal resistance of the inflow and outflow faces; it considers not only the three-dimensional heat conduction effect of a single path but also the actual fluid flow field effect.

[0080] Example 3

[0081] Please see Figure 2 The diagram shown is a structural block diagram of the thermal resistance calculation system for a battery pack proposed in the third embodiment of the present invention. The thermal resistance calculation system 200 includes: a modeling module 21, a definition module 22, a simulation module 23, a data acquisition module 24, an average temperature calculation module 25, a thermal resistance calculation module 26, and a total thermal resistance calculation module 27, wherein:

[0082] Modeling module 21 is used to obtain relevant parameters of each component of the battery pack and build a model of the battery pack based on the relevant parameters. Each component of the battery pack includes a module, an insulating layer, thermally conductive silicone, a flat tube, and a coolant pipeline.

[0083] Definition module 22 is used to set the heat input terminal and heat output terminal of each component of the battery pack according to the model of the battery pack;

[0084] Simulation module 23 is used to obtain the preset total heat generation power of the battery pack and perform three-dimensional thermal steady-state simulation calculation on the model of the battery pack based on the preset total heat generation power.

[0085] The acquisition module 24 is used to acquire the temperature parameters of the heat input end and the heat output end of each component of the battery pack, as well as the total heat dissipation power of the battery pack, during the three-dimensional thermal steady-state simulation calculation.

[0086] The average temperature calculation module 25 is used to obtain the average temperature of the heat input terminal and the heat output terminal according to the temperature parameters of the heat input terminal and the heat output terminal through a preset rule;

[0087] The thermal resistance calculation module 26 is used to divide the difference between the average temperature of the heat output end and the average temperature of the heat input end of each component of the battery pack by the total heat dissipation power to obtain the thermal resistance of each component of the battery pack.

[0088] The total thermal resistance calculation module 27 sums the thermal resistances of each component of the battery pack to obtain the total thermal resistance of the battery pack.

[0089] Furthermore, the modeling module 21 includes:

[0090] A collection unit is used to acquire the relevant parameters, which include three-dimensional model data of each component of the battery pack;

[0091] The classification processing unit is used to classify the three-dimensional model data according to the material of the parts and generate corresponding three-dimensional model part families.

[0092] The assembly unit is used to extract each part from the three-dimensional model part family in a preset order and install them in a predetermined spatial position to obtain the three-dimensional model of each component of the battery pack.

[0093] The assembly unit, based on the relevant parameters, spatially connects the three-dimensional models of the various components of the battery pack to form a three-dimensional model of the battery pack.

[0094] Furthermore, in other embodiments of the present invention, the secure communication system 200 further includes:

[0095] The assignment subunit is used to obtain the attribute parameters and assign the attribute parameters to the corresponding three-dimensional models of each component of the battery pack. The attribute parameters include at least material parameters and thermal performance parameters.

[0096] Furthermore, the thermal resistance calculation system for the battery pack also includes:

[0097] A circulation unit is used to obtain the second preset total heat generation power of the battery pack, and repeat the above steps according to the second preset total heat generation power to obtain the second thermal resistance of each component of the battery pack and the second total thermal resistance of the battery pack.

[0098] The comparison unit is used to compare the thermal resistance of each component of the battery pack with the second thermal resistance and to compare the total thermal resistance of the battery pack with the second total thermal resistance.

[0099] The verification unit is used to verify whether the thermal resistance calculation is correct by comparing the results.

[0100] The functions or operation steps implemented by the above modules are largely the same as those in the above method embodiments, and will not be repeated here.

[0101] Example 4

[0102] In another aspect, the present invention also proposes an electronic device, please refer to [link to relevant documentation]. Figure 3 The diagram shows an electronic device according to the third embodiment of the present invention, including a memory 20, a processor 10, and a computer program 30 stored in the memory and executable on the processor. When the processor 10 executes the computer program 30, it implements the method described above for converting two-dimensional drawings into three-dimensional models for drawing review.

[0103] In some embodiments, the processor 10 may be a central processing unit (CPU), controller, microcontroller, microprocessor or other data processing chip, used to run program code stored in memory 20 or process data, such as executing access restriction programs.

[0104] The memory 20 includes at least one type of readable storage medium, such as flash memory, hard disk, multimedia card, card-type memory (e.g., SD or DX memory), magnetic memory, magnetic disk, optical disk, etc. In some embodiments, the memory 20 can be an internal storage unit of an electronic device, such as the hard disk of the electronic device. In other embodiments, the memory 20 can also be an external storage device of the electronic device, such as a plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, etc. Furthermore, the memory 20 can include both internal and external storage units of the electronic device. The memory 20 can be used not only to store application software and various types of data of the electronic device, but also to temporarily store data that has been output or will be output.

[0105] It should be pointed out that, Figure 3 The structure shown does not constitute a limitation on the electronic device. In other embodiments, the electronic device may include fewer or more components than shown, or combine certain components, or have different component arrangements.

[0106] This invention also proposes a computer-readable storage medium storing a computer program that, when executed by a processor, implements the method described above for converting two-dimensional drawings into three-dimensional models for drawing review.

[0107] Those skilled in the art will understand that the logic and / or steps represented in the flowcharts or otherwise described herein, for example, can be considered as a ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can mean any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device.

[0108] More specific examples of computer-readable media (a non-exhaustive list) include: electrical connections (electronic devices) having one or more wires, portable computer disk drives (magnetic devices), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Furthermore, computer-readable media can even be paper or other suitable media on which the program can be printed, because the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in computer memory.

[0109] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0110] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0111] The above embodiments merely illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A method for calculating the thermal resistance of a battery pack, characterized in that, The method includes: Obtain relevant parameters of each component of the battery pack, and build a model of the battery pack based on the relevant parameters. Each component of the battery pack includes a module, an insulating layer, thermally conductive silicone, a flat tube, and a coolant pipeline. The heat input and heat output terminals of each component of the battery pack are set according to the model of the battery pack; Obtain the preset total heat generation power of the battery pack, and perform three-dimensional thermal steady-state simulation calculation on the model of the battery pack based on the preset total heat generation power; When obtaining the three-dimensional thermal steady-state simulation calculation, the temperature parameters of the heat input end and the heat output end of each component of the battery pack, as well as the total heat dissipation power of the battery pack; The average temperature of the heat input terminal and the heat output terminal is obtained according to the temperature parameters of the heat input terminal and the heat output terminal through a preset rule; The thermal resistance of each component of the battery pack is obtained by dividing the absolute value of the difference between the average temperature of the heat output end and the average temperature of the heat input end of each component by the total heat dissipation power. The total thermal resistance of the battery pack is obtained by summing the thermal resistances of each component of the battery pack. The preset rule is the average temperature of the module's heat input terminal. , It refers to the module volume; the average surface temperature of the module's heat output terminal. , It refers to the area of ​​the bottom surface of the module; the average temperature of the insulating heat input terminal. , It is the area of ​​the upper surface of the insulating pad; calculate the average temperature at the insulation heat output terminal. , It refers to the area of ​​the insulating base; the average temperature of the thermally conductive silicone heat input end. , It is the area of ​​the upper surface of the thermally conductive silicone; calculate the average temperature of the heat output end of the thermally conductive silicone. , It refers to the area of ​​the thermally conductive silicone base; the average temperature of the heat input end of the flat tube. , It is the area of ​​the upper end face of the flat tube; calculate the average surface temperature of the heat output end of the flat tube. , It is the area of ​​the inner surface of the flat tube's inlet that contacts the coolant piping; calculate the average surface temperature of the heat output end of the coolant piping. , Yes, the area; calculate the average temperature at the heat output end of the coolant piping. , It is the volume of coolant; For temperature.

2. The method for calculating the thermal resistance of a battery pack according to claim 1, characterized in that, The relevant parameters include at least the spatial, dimensional, and property parameters of the module, insulating layer, thermally conductive silicone, coolant piping, and coolant.

3. The method for calculating the thermal resistance of a battery pack according to claim 2, characterized in that, The steps of obtaining relevant parameters of each component of the battery pack and building a model of the battery pack based on the relevant parameters, wherein each component of the battery pack includes modules, insulating layers, thermally conductive silicone, flat tubes, and coolant pipelines, include: Obtain the relevant parameters, which include the three-dimensional model data of each component of the battery pack; The 3D model data is classified according to the material of the parts to generate corresponding 3D model part families; According to a preset order, each part is extracted from the three-dimensional model part family and placed in a predetermined spatial position to obtain the three-dimensional model of each component of the battery pack. Based on the relevant parameters, the three-dimensional models of the various components of the battery pack are spatially connected to form the three-dimensional model of the battery pack.

4. The method for calculating the thermal resistance of a battery pack according to claim 1, characterized in that, The heat input end of the module is the entire module, and the heat output end is the bottom surface of the module; The heat input end of the insulating layer is the upper surface of the insulating layer, and the heat output end is the bottom surface of the insulating layer; The heat input end of the thermally conductive silicone is the upper surface of the thermally conductive silicone, and the heat output end is the bottom surface of the thermally conductive silicone; The heat input end of the flat tube is the upper end face of the flat tube, and the heat output end is the inner surface of the tube opening that contacts the coolant pipeline. The heat input end of the coolant pipeline is the outer surface of the coolant pipeline that contacts the flat tube, and the heat output end is the entire coolant inside the coolant pipeline.

5. The method for calculating the thermal resistance of a battery pack according to claim 3, characterized in that, The step of spatially connecting the three-dimensional models of the relevant components of the battery pack according to the relevant parameters to form the three-dimensional model of the battery pack includes: The attribute parameters are obtained and assigned to the corresponding three-dimensional models of each component of the battery pack. The attribute parameters include at least material parameters and thermal performance parameters.

6. The method for calculating the thermal resistance of a battery pack according to claim 5, characterized in that, After the step of summing the thermal resistances of each component of the battery pack to obtain the thermal resistance of the battery pack, the following steps are included: Obtain the second preset total heat generation power of the battery pack; Based on the second preset total heating power, repeat the above steps to obtain the second thermal resistance of each component of the battery pack and the second total thermal resistance of the battery pack; The thermal resistance of each component of the battery pack is compared with the second thermal resistance, and the total thermal resistance of the battery pack is compared with the second total thermal resistance. The thermal resistance calculation was verified by comparing the results.

7. The method for calculating the thermal resistance of a battery pack according to claim 5, characterized in that, The properties of the coolant include at least density, thermal conductivity, specific heat capacity, inlet flow rate, and inlet temperature.

8. A thermal resistance calculation system for a battery pack, characterized in that, The system for implementing the thermal resistance calculation method for the battery pack according to any one of claims 1 to 7 comprises: The modeling module is used to obtain relevant parameters of each component of the battery pack and build a model of the battery pack based on the relevant parameters. Each component of the battery pack includes a module, an insulating layer, thermally conductive silicone, a flat tube, and a coolant pipeline. The definition module is used to set the heat input and heat output terminals of each component of the battery pack according to the model of the battery pack; The simulation module is used to obtain the preset total heat generation power of the battery pack and perform three-dimensional thermal steady-state simulation calculations on the model of the battery pack based on the preset total heat generation power. The acquisition module is used to acquire the temperature parameters of the heat input and heat output terminals of each component of the battery pack, as well as the total heat dissipation power of the battery pack, during the three-dimensional thermal steady-state simulation calculation. An average temperature calculation module is used to obtain the average temperature of the heat input terminal and the heat output terminal according to the temperature parameters of the heat input terminal and the heat output terminal through a preset rule; The thermal resistance calculation module is used to divide the difference between the average temperature of the heat output end and the average temperature of the heat input end of each component of the battery pack by the total heat dissipation power to obtain the thermal resistance of each component of the battery pack. The total thermal resistance calculation module sums the thermal resistances of each component of the battery pack to obtain the total thermal resistance of the battery pack.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the steps of the method for calculating the thermal resistance of a battery pack as described in any one of claims 1 to 7.

10. An electronic device, characterized in that, It includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the thermal resistance calculation method for the battery pack as described in any one of claims 1-7.

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