A method and device for establishing a flow field simulation model of a liquid cooling system of a battery exchange device

Abstract

The present invention discloses a method and device for establishing a flow field simulation model of a liquid cooling system of a battery swapping device. The method includes: obtaining the set flow resistance, calculated flow resistance, first flow velocity and first inertia coefficient value of the flow channel of the battery pack thermal management system, and determining the first viscosity coefficient value according to the set flow resistance, calculated flow resistance, first flow velocity and first inertia coefficient value; establishing an initial model for flow field simulation of the liquid cooling system of the battery swapping device according to the first inertia coefficient value and the first viscosity coefficient value; simulating the initial model, and performing a physical test on the liquid cooling system of the battery swapping device, or simulating the battery pack thermal management system model, correcting the first inertia coefficient value to the second inertia coefficient value, and correcting the first viscosity coefficient value to the second viscosity coefficient value; establishing a corrected model for flow field simulation of the liquid cooling system of the battery swapping device according to the second inertia coefficient value and the second viscosity coefficient value. The present invention achieves the effect of reducing the simulation error of the flow field of the liquid cooling system of the battery swapping device.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of simulation technology, and in particular to a method and device for establishing a flow field simulation model of a liquid cooling system of a battery swap device. Background Art

[0002] The battery swap device is a key component of a vehicle battery swap station. The thermal management performance of the battery swap device is related to whether it can work normally. To ensure the thermal management performance, it is necessary to ensure the performance of the flow field of the liquid cooling system of the battery swap device. Therefore, it is necessary to simulate and analyze the flow field of the liquid cooling pipeline of the battery swap device through simulation means in the early stage of the design of the battery swap device to verify its flow field uniformity and flow resistance.

[0003] In the early stages of design, the flow channels of the battery pack thermal management system are not designed in detail, and often only rough flow resistance requirements can be given. The flow resistance of the flow channels of the battery pack thermal management system is generally large. When simulating the liquid cooling system of the battery swap device, if the flow resistance of the flow channels of the battery pack thermal management system is directly ignored, the error in the flow field simulation results of the liquid cooling system of the battery swap device will be large. Summary of the invention

[0004] The present invention provides a method and device for establishing a flow field simulation model of a liquid cooling system of a battery swapping device, so as to reduce the error of the flow field simulation of the liquid cooling system of the battery swapping device and improve the accuracy of the flow field simulation of the liquid cooling system of the battery swapping device.

[0005] In a first aspect, an embodiment of the present invention provides a method for establishing a flow field simulation model of a liquid cooling system of a battery swapping device, and the method for establishing a flow field simulation model of a liquid cooling system of a battery swapping device includes:

[0006] Obtaining a set flow resistance, a calculated flow resistance, a first flow velocity, and a first inertia coefficient value of a flow channel of a battery pack thermal management system, and determining a first viscosity coefficient value according to the set flow resistance, the calculated flow resistance, the first flow velocity, and the first inertia coefficient value;

[0007] Establishing an initial model for flow field simulation of a liquid cooling system of a battery swap device according to the first inertia coefficient value and the first viscosity coefficient value;

[0008] Simulating the initial model, and performing a physical test on the liquid cooling system of the battery swapping device, or simulating the battery pack thermal management system model, correcting the first inertia coefficient value to the second inertia coefficient value, and correcting the first viscosity coefficient value to the second viscosity coefficient value;

[0009] A correction model for flow field simulation of the liquid cooling system of the battery exchange device is established based on the second inertia coefficient value and the second viscosity coefficient value.

[0010] Optionally, determining a first viscosity coefficient value according to the set flow resistance, the calculated flow resistance, the first flow velocity and the first inertia coefficient value comprises:

[0011] Determine the first medium boundary flow resistance according to the set flow resistance and the calculated flow resistance;

[0012] A first viscosity coefficient value is determined according to the first flow velocity, the first medium boundary flow resistance, and a first inertia coefficient value.

[0013] Optionally, obtaining a set flow resistance, a calculated flow resistance, a first flow velocity, and a first inertia coefficient value of a flow channel of a battery pack thermal management system includes:

[0014] Determine a configuration pipeline corresponding to the flow channel of the battery pack thermal management system;

[0015] The set flow resistance of the flow channel of the battery pack thermal management system is obtained, and the calculated flow resistance, the first flow velocity and the first inertia coefficient value are obtained according to the configuration pipeline corresponding to the flow channel of the battery pack thermal management system.

[0016] Optionally, obtaining the calculated flow resistance, the first flow velocity and the first inertia coefficient value according to a configuration pipeline corresponding to the flow channel of the battery pack thermal management system includes:

[0017] Determine the flow rate of each branch of the configuration pipeline corresponding to the flow channel of the battery pack thermal management system according to the set flow rate;

[0018] The first flow rate is determined according to the branch flow, and the calculated flow resistance is determined according to the branch flow.

[0019] Optionally, the configuration pipeline corresponding to the flow channel of the battery pack thermal management system includes a straight pipe or a U-shaped pipe.

[0020] Optionally, before determining the configuration pipeline corresponding to the flow channel of the battery pack thermal management system, the method further includes:

[0021] Determine parameter information of the liquid cooling system of the battery exchange device; wherein the parameter information includes qualitative temperature, fluid medium, medium inlet position and medium outlet position.

[0022] Optionally, simulating a battery pack thermal management system model, correcting the first inertia coefficient value to a second inertia coefficient value, and correcting the first viscosity coefficient value to a second viscosity coefficient value, includes:

[0023] Calculate a first simulated flow resistance of a flow channel of the battery pack thermal management system under at least two flow rates according to the battery pack thermal management system model simulation;

[0024] The second inertia coefficient value and the second viscosity coefficient value are calculated according to the first simulated flow resistance and the second simulated flow resistance corresponding to each flow rate and the second flow velocity corresponding to each flow rate.

[0025] Optionally, calculating the second inertia coefficient value and the second viscosity coefficient according to the first simulated flow resistance and the second simulated flow resistance corresponding to each flow rate and the second flow velocity corresponding to each flow rate includes:

[0026] Determine the second medium boundary flow resistance corresponding to each flow rate according to the first simulated flow resistance and the second simulated flow resistance corresponding to each flow rate;

[0027] Determine a relationship between the second medium boundary flow resistance and the second flow velocity;

[0028] The second inertia coefficient value and the second viscosity coefficient value are calculated according to the relational expression.

[0029] Optionally, simulating the initial model and physically testing the liquid cooling system of the battery swapping device, correcting the first inertia coefficient value to a second inertia coefficient value, and correcting the first viscosity coefficient value to a second viscosity coefficient value, include:

[0030] Calculate the third simulated flow resistance of the flow channel of the battery pack thermal management system according to the initial model simulation, calculate the fourth simulated flow resistance of the flow field of the liquid cooling system of the battery swap device, and determine the uniformity of the first flow field of the liquid cooling system of the battery swap device;

[0031] Performing a physical test on the liquid cooling system of the battery swap device to obtain a first physical flow resistance of the flow channel of the battery pack thermal management system, a second physical flow resistance of the liquid cooling system of the battery swap device, and a second flow field uniformity of the liquid cooling system of the battery swap device;

[0032] When it is determined that the difference between the first physical flow resistance and the third simulated flow resistance is greater than the first preset difference, or the difference between the second physical flow resistance and the fourth simulated flow resistance is greater than the second preset difference, or the difference between the second flow field uniformity and the first flow field uniformity is greater than the third preset difference, the first inertia coefficient value is corrected to the second inertia coefficient value, and the first viscosity coefficient value is corrected to the second viscosity coefficient value according to the first physical flow resistance, the second physical flow resistance or the second flow field uniformity.

[0033] In a second aspect, an embodiment of the present invention further provides a device for establishing a flow field simulation model of a liquid cooling system of a battery swapping device, and the device for establishing a flow field simulation model of a liquid cooling system of a battery swapping device comprises:

[0034] An initial value acquisition module, the initial value acquisition module is used to obtain a set flow resistance, a calculated flow resistance, a first flow velocity and a first inertia coefficient value of a flow channel of a battery pack thermal management system, and determine a first viscosity coefficient value according to the set flow resistance, the calculated flow resistance, the first flow velocity and the first inertia coefficient value;

[0035] An initial model building module, the initial model building module is used to build an initial model for flow field simulation of a liquid cooling system of a battery swap device according to the first inertia coefficient value and the first viscosity coefficient value;

[0036] A correction module, the correction module is used to simulate the initial model, and perform a physical test on the liquid cooling system of the battery swap device, or simulate the battery pack thermal management system model, correct the first inertia coefficient value to a second inertia coefficient value, and correct the first viscosity coefficient value to a second viscosity coefficient value;

[0037] A correction model establishment module is used to establish a correction model for the flow field simulation of the liquid cooling system of the battery exchange device according to the second inertia coefficient value and the second viscosity coefficient value.

[0038] The present invention obtains the set flow resistance, calculated flow resistance, first flow velocity and first inertia coefficient value of the flow channel of the battery pack thermal management system, and determines the first viscosity coefficient value according to the set flow resistance, calculated flow resistance, first flow velocity and first inertia coefficient value. It can determine the porous medium boundary, and can determine the model corresponding to the flow channel of the battery pack thermal management system. It can establish an initial model for flow field simulation of the liquid cooling system of the battery swap device, simulate the initial model, and perform a physical test on the liquid cooling system of the battery swap device. The flow resistance of the flow channel of the battery pack thermal management system calculated by simulation is subtracted from the flow resistance of the flow channel of the battery pack thermal management system obtained by the physical test of the liquid cooling system of the battery swap device. If the difference between the two is greater than the first preset difference, the first inertia coefficient can be corrected according to the flow resistance of the flow channel of the battery pack thermal management system obtained by the physical test. The numerical value is the second inertia coefficient value, and the first viscosity coefficient value is corrected to the second viscosity coefficient value; or, the flow resistance of the flow field of the liquid cooling system of the battery swap device calculated by simulation is subtracted from the flow field flow resistance of the liquid cooling system of the battery swap device in the actual test. If the difference is greater than the second preset difference, the first inertia coefficient value can be corrected to the second inertia coefficient value according to the flow field flow resistance of the liquid cooling system of the battery swap device in the actual test, and the first viscosity coefficient value can be corrected to the second viscosity coefficient value; or, the first flow field uniformity of the liquid cooling system of the battery swap device calculated by simulation is subtracted from the second flow field uniformity of the liquid cooling system of the battery swap device in the actual test. If the difference is greater than the third preset difference, the first inertia coefficient value can be corrected to the second inertia coefficient value according to the second flow field uniformity of the actual test, and the first viscosity coefficient value can be corrected to the second viscosity coefficient value. Alternatively, the existing battery pack thermal management system model can be simulated under different operating conditions. For example, the flow resistance of the flow channel of the battery pack thermal management system under different flow rates can be simulated to obtain multiple sets of data. The relationship between the flow resistance and flow velocity of the flow channel of the battery pack thermal management system can be determined based on the multiple sets of data, and the second inertia coefficient value and the second viscosity coefficient value can be directly calculated, so as to correct the first inertia coefficient value and the first viscosity coefficient value. According to the corrected value of the second coefficient of inertia and the second viscosity coefficient, the accurate porous medium boundary can be obtained, and a corrected model for the flow field simulation of the liquid cooling system of the battery swapping device can be established. By simulating the corrected model for the flow field simulation of the liquid cooling system of the battery swapping device, the flow resistance and other parameters of the flow field of the liquid cooling system of the battery swapping device can be calculated, which is convenient for analyzing the flow field uniformity of the liquid cooling system of the battery swapping device. The corrected model of the liquid cooling system of the battery swapping device includes the model corresponding to the flow channel of the battery pack thermal management system. Therefore, by simulating the corrected model, the flow resistance of the flow field of the liquid cooling system of the battery swapping device can be calculated more accurately, thereby reducing the error of the flow field simulation of the liquid cooling system of the battery swapping device and improving the accuracy of the flow field simulation of the liquid cooling system of the battery swapping device.The present invention solves the problem that directly ignoring the flow resistance of the flow channel of the battery pack thermal management system will result in large errors in the flow field simulation results of the liquid cooling system of the battery swapping device. It achieves the effect of reducing the error of the flow field simulation of the liquid cooling system of the battery swapping device and improves the accuracy of the flow field simulation of the liquid cooling system of the battery swapping device. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a flow chart of a method for establishing a flow field simulation model of a liquid cooling system of a battery swapping device provided by an embodiment of the present invention;

[0040] Figure 2 It is a flow chart of another method for establishing a flow field simulation model of a liquid cooling system of a battery swapping device provided by an embodiment of the present invention;

[0041] Figure 3 It is a flow chart of another method for establishing a flow field simulation model of a liquid cooling system of a battery swapping device provided by an embodiment of the present invention;

[0042] Figure 4 It is a flow chart of another method for establishing a flow field simulation model of a liquid cooling system of a battery swapping device provided by an embodiment of the present invention;

[0043] Figure 5 It is a flow chart of another method for establishing a flow field simulation model of a liquid cooling system of a battery swapping device provided by an embodiment of the present invention;

[0044] Figure 6 yes Figure 5 A flowchart of a calculation method included in S540;

[0045] Figure 7 It is a flow chart of another method for establishing a flow field simulation model of a liquid cooling system of a battery swapping device provided by an embodiment of the present invention;

[0046] Figure 8 It is a structural schematic diagram of a device for establishing a flow field simulation model of a liquid cooling system of a battery exchange device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0047] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0048] Figure 1 This is a flow chart of a method for establishing a flow field simulation model of a liquid cooling system of a battery swapping device provided by an embodiment of the present invention. Figure 1 , the method for establishing the flow field simulation model of the liquid cooling system of the battery swapping device includes:

[0049] S110, obtaining a set flow resistance, a calculated flow resistance, a first flow velocity, and a first inertia coefficient value of a flow channel of a battery pack thermal management system, and determining a first viscosity coefficient value based on the set flow resistance, the calculated flow resistance, the first flow velocity, and the first inertia coefficient value.

[0050] Among them, the set flow resistance of the flow channel of the battery pack thermal management system can be obtained based on the experience of the same or similar battery pack thermal management systems, the calculated flow resistance is calculated based on the configuration pipeline corresponding to the flow channel of the battery pack thermal management system and the set flow rate, the first flow rate is calculated based on the set flow rate, and the first inertia coefficient value is set. The first inertia coefficient value is, for example, greater than or equal to 0.1 and less than or equal to 3. Exemplarily, the first inertia coefficient value can be set to 1. The flow resistance of the flow channel of the battery pack thermal management system is the sum of the flow resistance of the configuration pipeline corresponding to the flow channel of the battery pack thermal management system and the flow resistance of the medium boundary. The medium boundary is, for example, a porous medium boundary. Therefore, the flow resistance of the porous medium boundary can be obtained by obtaining the set flow resistance and the calculated flow resistance of the flow channel of the battery pack thermal management system, and then the first viscosity coefficient value can be determined based on the flow resistance of the porous medium boundary, the first flow rate and the first inertia coefficient value.

[0051] S120. Establish an initial model for flow field simulation of the liquid cooling system of the battery exchange device according to the first inertia coefficient value and the first viscosity coefficient value.

[0052] Specifically, after calculating the first inertia coefficient value and the first viscosity coefficient value, the porous medium boundary can be determined, the model corresponding to the flow channel of the battery pack thermal management system can be determined, and the initial model of the liquid cooling system can be established. For example, it can be an initial model for the flow field simulation of the liquid cooling system of a battery swapping device, wherein the battery swapping device is a device used by a battery swapping station to replace battery packs on vehicles, etc.

[0053] S130. Simulate the initial model and conduct a physical test on the liquid cooling system of the battery swap device, or simulate the battery pack thermal management system model, correct the first inertia coefficient value to the second inertia coefficient value, and correct the first viscosity coefficient value to the second viscosity coefficient value.

[0054] Specifically, the initial model of the flow field simulation of the liquid cooling system of the battery swap device includes the model corresponding to the flow channel of the battery pack thermal management system, so simulating the initial model can more accurately calculate the flow resistance of the flow field of the liquid cooling system of the battery swap device, and can determine the flow resistance of the flow channel of the battery pack thermal management system, the flow resistance of the flow field of the liquid cooling system of the battery swap device, and the flow field uniformity. By subtracting the flow resistance of the flow channel of the battery pack thermal management system calculated by simulation from the flow resistance of the flow channel of the battery pack thermal management system obtained by the physical test of the liquid cooling system of the battery swap device, if the difference between the two is less than the first preset difference, it indicates that the first inertia coefficient value and the first viscosity coefficient value are in line with the actual situation, and the first inertia coefficient value and the first viscosity coefficient value do not need to be corrected; if the difference between the two is greater than the first preset difference, it indicates that the error of the flow resistance of the flow channel of the battery pack thermal management system calculated by simulation using the first inertia coefficient value and the first viscosity coefficient value is large, then the first inertia coefficient value can be corrected to the second inertia coefficient value based on the flow resistance of the flow channel of the battery pack thermal management system obtained by the physical test, and the first viscosity coefficient value can be corrected to the second inertia coefficient value. The second viscosity coefficient value; or, subtract the flow resistance of the flow field of the liquid cooling system of the battery swap device calculated by simulation from the flow resistance of the flow field of the liquid cooling system of the battery swap device in the actual test. If the difference is greater than the second preset difference, the first inertia coefficient value can be corrected to the second inertia coefficient value according to the flow field resistance of the liquid cooling system of the battery swap device in the actual test, and the first viscosity coefficient value can be corrected to the second viscosity coefficient value; or, subtract the first flow field uniformity of the liquid cooling system of the battery swap device calculated by simulation from the flow field uniformity of the liquid cooling system of the battery swap device in the actual test. If the difference is greater than the third preset difference, the first inertia coefficient value can be corrected to the second inertia coefficient value according to the second flow field uniformity of the actual test, and the first viscosity coefficient value can be corrected to the second viscosity coefficient value.

[0055] Alternatively, the existing battery pack thermal management system model can be simulated under different operating conditions. For example, the flow resistance of the flow channel of the battery pack thermal management system under different flow rates can be simulated to obtain multiple sets of data. The relationship between the flow resistance and flow velocity of the flow channel of the battery pack thermal management system can be determined based on the multiple sets of data, and the second inertia coefficient value and the second viscosity coefficient value can be directly calculated, so as to correct the first inertia coefficient value and the first viscosity coefficient value.

[0056] S140. Establish a correction model for flow field simulation of the liquid cooling system of the battery exchange device according to the second inertia coefficient value and the second viscosity coefficient value.

[0057] Specifically, according to the corrected value of the second coefficient of inertia and the second viscosity coefficient, the accurate porous medium boundary can be obtained, and a corrected model for the flow field simulation of the liquid cooling system of the battery swapping device can be established. By simulating the corrected model for the flow field simulation of the liquid cooling system, the flow resistance and other parameters of the flow field of the liquid cooling system of the battery swapping device can be calculated, which is convenient for analyzing the flow field uniformity of the liquid cooling system of the battery swapping device. The corrected model for the flow field simulation of the liquid cooling system of the battery swapping device includes the model corresponding to the flow channel of the battery pack thermal management system. Therefore, by simulating the corrected model, the flow resistance of the flow field of the liquid cooling system of the battery swapping device can be calculated more accurately, thereby reducing the error of the flow field simulation of the liquid cooling system of the battery swapping device and improving the accuracy of the flow field simulation of the liquid cooling system of the battery swapping device.

[0058] The technical solution of this embodiment can determine the porous medium boundary by obtaining the set flow resistance, calculated flow resistance, first flow velocity and first inertia coefficient value of the flow channel of the battery pack thermal management system, and determine the first viscosity coefficient value based on the set flow resistance, calculated flow resistance, first flow velocity and first inertia coefficient value. It can also determine the model corresponding to the flow channel of the battery pack thermal management system, and establish an initial model for flow field simulation of the liquid cooling system of the battery swap device. The initial model is simulated, and the liquid cooling system of the battery swap device is physically tested. The flow resistance of the flow channel of the battery pack thermal management system calculated by simulation is subtracted from the flow resistance of the flow channel of the battery pack thermal management system obtained by the physical test of the liquid cooling system of the battery swap device. If the difference between the two is greater than the first preset difference, the first flow resistance of the flow channel of the battery pack thermal management system obtained by the physical test can be corrected. The first inertia coefficient value is the second inertia coefficient value, and the first viscosity coefficient value is corrected to the second viscosity coefficient value; or, the flow resistance of the flow field of the liquid cooling system of the battery swap device calculated by simulation is subtracted from the flow field flow resistance of the liquid cooling system of the battery swap device in the actual test. If the difference is greater than the second preset difference, the first inertia coefficient value can be corrected to the second inertia coefficient value according to the flow field flow resistance of the liquid cooling system of the battery swap device in the actual test, and the first viscosity coefficient value can be corrected to the second viscosity coefficient value; or, the first flow field uniformity of the liquid cooling system of the battery swap device calculated by simulation is subtracted from the second flow field uniformity of the liquid cooling system of the battery swap device in the actual test. If the difference is greater than the third preset difference, the first inertia coefficient value can be corrected to the second inertia coefficient value according to the second flow field uniformity of the actual test, and the first viscosity coefficient value can be corrected to the second viscosity coefficient value. Alternatively, the existing battery pack thermal management system model can be simulated under different working conditions. For example, the flow resistance of the flow channel of the battery pack thermal management system under different flow rates can be simulated and calculated to obtain multiple sets of data. Based on the multiple sets of data, the relationship between the flow resistance and flow velocity of the flow channel of the battery pack thermal management system can be determined, and the second inertia coefficient value and the second viscosity coefficient value can be directly calculated, so that the first inertia coefficient value and the first viscosity coefficient value can be corrected. According to the corrected second inertia coefficient value and the second viscosity coefficient value, an accurate porous medium boundary can be obtained, and a correction model for the flow field simulation of the liquid cooling system of the battery swap device can be established. By simulating the correction model for the flow field simulation of the liquid cooling system of the battery swap device, the flow resistance and other parameters of the flow field of the liquid cooling system of the battery swap device can be calculated, which is convenient for analyzing the uniformity of the flow field of the liquid cooling system. The correction model of the liquid cooling system of the battery swap device includes the model corresponding to the flow channel of the battery pack thermal management system. Therefore, by simulating the correction model, the flow resistance of the liquid cooling system can be calculated more accurately, thereby reducing the error of the flow field simulation of the liquid cooling system of the battery swap device and improving the accuracy of the flow field simulation of the liquid cooling system of the battery swap device.The technical solution of this embodiment solves the problem that directly ignoring the flow resistance of the flow channel of the battery pack thermal management system will result in large errors in the flow field simulation results of the liquid cooling system of the battery swapping device. It achieves the effect of reducing the error of the flow field simulation of the liquid cooling system of the battery swapping device and improves the accuracy of the flow field simulation of the liquid cooling system of the battery swapping device.

[0059] Based on the above implementation scheme, this implementation scheme is a further refinement of S110 in the above implementation scheme. Figure 2 is a flowchart of another method for establishing a flow field simulation model of a liquid cooling system of a battery swap device provided by an embodiment of the present invention. Optionally, see Figure 2 , the method for establishing the flow field simulation model of the liquid cooling system of the battery swapping device includes:

[0060] S210, obtaining a set flow resistance, a calculated flow resistance, a first flow velocity, and a first inertia coefficient value of a flow channel of a battery pack thermal management system, and determining a first medium boundary flow resistance according to the set flow resistance and the calculated flow resistance.

[0061] Specifically, an internal surface is established at any cross-section of the configuration pipeline corresponding to the flow channel of the battery pack thermal management system. The internal surface can be defined as a porous medium boundary. The flow resistance of the flow channel of the battery pack thermal management system is the sum of the flow resistance of the configuration pipeline corresponding to the flow channel of the battery pack thermal management system and the flow resistance of the medium boundary. The medium boundary is, for example, a porous medium boundary. Therefore, according to the set flow resistance P1 and the calculated flow resistance P2 of the flow channel of the battery pack thermal management system, the first medium boundary flow resistance ΔP1=P1-P2 can be determined.

[0062] S220. Determine a first viscosity coefficient value according to a first flow velocity, a first medium boundary flow resistance, and a first inertia coefficient value.

[0063] Specifically, assuming that the first flow velocity is u1, the first inertia coefficient value is α1, the first viscosity coefficient value is β1, and the density of the fluid medium in the flow channel of the battery pack thermal management system is ρ, then the first medium boundary flow resistance is ΔP1 = ρ × (α1 × u1 + β1) × u1. The first viscosity coefficient value β1 can be determined based on the set flow resistance P1, the calculated flow resistance P2, the first flow velocity u1 and the first inertia coefficient value α1.

[0064] S230. Establish an initial model for flow field simulation of the liquid cooling system of the battery exchange device according to the first inertia coefficient value and the first viscosity coefficient value.

[0065] S240. Simulate the initial model and conduct a physical test on the liquid cooling system of the battery swap device, or simulate the battery pack thermal management system model, correct the first inertia coefficient value to the second inertia coefficient value, and correct the first viscosity coefficient value to the second viscosity coefficient value.

[0066] S250. Establish a correction model for flow field simulation of the liquid cooling system of the battery exchange device according to the second inertia coefficient value and the second viscosity coefficient value.

[0067] The technical solution of this embodiment obtains the set flow resistance, calculated flow resistance, first flow velocity and first inertia coefficient value of the flow channel of the battery pack thermal management system, and determines the first medium boundary flow resistance according to the set flow resistance and the calculated flow resistance, so that the first viscosity coefficient value can be calculated according to the first flow velocity, the first medium boundary flow resistance and the first inertia coefficient value, and the medium boundary can be determined according to the first inertia coefficient value and the first viscosity coefficient value, so that an initial model for the flow field simulation of the liquid cooling system of the battery swapping device can be established, the initial model can be simulated, and the liquid cooling system of the battery swapping device can be physically tested, or, the existing battery pack thermal management system model can be simulated under different working conditions, the first inertia coefficient value can be corrected to the second inertia coefficient value, and the first viscosity coefficient value can be corrected to the second viscosity coefficient value, so that a corrected model for the flow field simulation of the liquid cooling system of the battery swapping device can be established according to the second inertia coefficient value and the second viscosity coefficient value, and the corrected model for the flow field simulation of the liquid cooling system of the battery swapping device includes the model corresponding to the flow channel of the battery pack thermal management system, so by simulating the corrected model, the flow resistance of the liquid cooling system can be calculated more accurately.

[0068] Figure 3 is a flowchart of another method for establishing a flow field simulation model of a liquid cooling system of a battery swap device provided by an embodiment of the present invention. Optionally, see Figure 3 , the method for establishing the flow field simulation model of the liquid cooling system of the battery swapping device includes:

[0069] S310, determining the configuration pipeline corresponding to the flow channel of the battery pack thermal management system.

[0070] Specifically, determine the configuration pipeline corresponding to the flow channel of the battery pack thermal management system, that is, determine the pipeline model corresponding to the flow channel of the battery pack thermal management system. When simulating the liquid cooling system, the configuration pipeline can be used to replace the flow channel of the battery pack thermal management system, so as to simulate and calculate the flow resistance of the flow channel of the battery pack thermal management system.

[0071] Optionally, the configuration pipeline corresponding to the flow channel of the battery pack thermal management system includes a straight pipe or a U-shaped pipe.

[0072] Specifically, straight tubes or U-shaped tubes can be used to replace the flow channels of the battery pack thermal management system. The straight tubes and U-shaped tubes have simple structures and can simplify the model of the flow field simulation of the liquid cooling system of the battery swapping device. When calculating the flow resistance of the configured pipeline, the flow resistance formula can be directly used for calculation, thereby simplifying the calculation process.

[0073] It should be noted that the method for establishing the flow field simulation model of the liquid cooling system of the battery exchange device in this embodiment can also be applied to pipelines with complex configurations. When calculating the flow resistance of pipelines with complex configurations, simulation calculations can be performed on the pipelines with complex configurations.

[0074] S320. Obtain the set flow resistance of the flow channel of the battery pack thermal management system, and obtain the calculated flow resistance, the first flow velocity and the first inertia coefficient value according to the configuration pipeline corresponding to the flow channel of the battery pack thermal management system, and determine the first viscosity coefficient value according to the set flow resistance, the calculated flow resistance, the first flow velocity and the first inertia coefficient value.

[0075] Specifically, the set flow resistance of the flow channel of the battery pack thermal management system is obtained based on the experience of the same or similar battery pack thermal management system, the calculated flow resistance is calculated based on the configuration pipeline corresponding to the flow channel of the battery pack thermal management system, and the corresponding first flow rate and first inertia coefficient value are determined based on the configuration pipeline corresponding to the flow channel of the battery pack thermal management system. After obtaining the set flow resistance, calculated flow resistance, first flow rate and first inertia coefficient value, the first viscosity coefficient value can be calculated based on the set flow resistance, calculated flow resistance, first flow rate and first inertia coefficient value.

[0076] Optionally, obtaining and calculating the flow resistance, the first flow velocity, and the first inertia coefficient value according to a configuration pipeline corresponding to the flow channel of the battery pack thermal management system includes:

[0077] Step a: determine the flow rates of each branch of the configuration pipeline corresponding to the flow channel of the battery pack thermal management system according to the set flow rate.

[0078] Specifically, the set flow rate is the total flow rate of the flow field simulation of the liquid cooling system of the battery swapping device. According to the set flow rate, the branch flow rate of each branch of the configuration pipeline corresponding to the flow channel of the battery pack thermal management system can be determined. Exemplarily, the set flow rate can be evenly divided according to the number of branches of the flow field of the liquid cooling system of the battery swapping device to obtain the branch flow rates of the configuration pipelines corresponding to the flow channels of the battery pack thermal management system.

[0079] Step b: determining a first flow velocity according to the branch flow, and determining and calculating the flow resistance according to the branch flow.

[0080] Specifically, the first flow velocity of each branch can be calculated based on the branch flow and the cross-sectional area of ​​each branch, and the calculated flow resistance corresponding to the flow channel of the battery pack thermal management system can be calculated based on the branch flow and the pressure difference between the inlet and outlet of the branch.

[0081] S330. Establish an initial model for flow field simulation of the liquid cooling system of the battery exchange device according to the first inertia coefficient value and the first viscosity coefficient value.

[0082] S340. Simulate the initial model, and conduct a physical test on the liquid cooling system of the battery swap device, or simulate the battery pack thermal management system model, correct the first inertia coefficient value to the second inertia coefficient value, and correct the first viscosity coefficient value to the second viscosity coefficient value.

[0083] S350. Establish a correction model for flow field simulation of the liquid cooling system of the battery exchange device according to the second inertia coefficient value and the second viscosity coefficient value.

[0084] The technical solution of this embodiment, by determining the configuration pipeline corresponding to the flow channel of the battery pack thermal management system, can use a straight tube or a U-shaped tube to represent the flow channel of the battery pack thermal management system, and the calculated flow resistance, first flow velocity and first inertia coefficient value can be obtained according to the configuration pipeline corresponding to the flow channel of the battery pack thermal management system, so that the initial model of the flow field simulation of the liquid cooling system of the battery swapping device can be established according to the first inertia coefficient value and the first viscosity coefficient value.

[0085] Figure 4 is a flowchart of another method for establishing a flow field simulation model of a liquid cooling system of a battery swap device provided by an embodiment of the present invention. Optionally, see Figure 4 , the method for establishing the flow field simulation model of the liquid cooling system of the battery swapping device includes:

[0086] S410. Determine parameter information of the liquid cooling system of the battery exchange device; wherein the parameter information includes qualitative temperature, fluid medium, medium inlet position and medium outlet position.

[0087] Specifically, when establishing a model of the liquid cooling system of a battery swapping device, the parameter information of the liquid cooling system of the battery swapping device must first be determined, such as determining the qualitative temperature, fluid medium, medium inlet position, and medium outlet position of the liquid cooling system of the battery swapping device. The qualitative temperature refers to the temperature used by a certain medium when calculating physical parameters. Within the temperature range, if the viscosity of the medium changes slightly, the medium inlet temperature can be taken as the qualitative temperature. If the viscosity of the medium changes greatly, the average temperature of the inlet and outlet can be taken as the qualitative temperature. All physical parameters of the liquid cooling system, such as flow rate, flow resistance, etc., are determined at the qualitative temperature. The fluid medium may be water, for example, or other media. The parameter information of the liquid cooling system of the battery swapping device may also include the connection method of the pipelines in the liquid cooling system, etc., to determine whether the pipelines are in parallel or in series. The parameter information may also include other information, which is not limited here.

[0088] S420, obtaining a set flow resistance, a calculated flow resistance, a first flow velocity, and a first inertia coefficient value of a flow channel of a battery pack thermal management system, and determining a first viscosity coefficient value based on the set flow resistance, the calculated flow resistance, the first flow velocity, and the first inertia coefficient value.

[0089] S430. Establish an initial model for flow field simulation of the liquid cooling system of the battery exchange device according to the first inertia coefficient value and the first viscosity coefficient value.

[0090] S440. Simulate the initial model, and perform a physical test on the liquid cooling system of the battery swap device, or simulate the battery pack thermal management system model, correct the first inertia coefficient value to the second inertia coefficient value, and correct the first viscosity coefficient value to the second viscosity coefficient value.

[0091] S450. Establish a correction model for flow field simulation of the liquid cooling system of the battery exchange device according to the second inertia coefficient value and the second viscosity coefficient value.

[0092] The technical solution of this embodiment can determine the design concept of the liquid cooling system of the battery swapping device by determining the parameter information of the liquid cooling system of the battery swapping device, wherein the parameter information includes qualitative temperature, fluid medium, medium inlet position and medium outlet position, and based on the qualitative temperature, the physical parameters of the medium can be calculated to facilitate determination of the model for flow field simulation of the liquid cooling system of the battery swapping device.

[0093] Figure 5 is a flowchart of another method for establishing a flow field simulation model of a liquid cooling system of a battery swap device provided by an embodiment of the present invention. Optionally, see Figure 5 , the method for establishing the flow field simulation model of the liquid cooling system of the battery swapping device includes:

[0094] S510, obtaining a set flow resistance, a calculated flow resistance, a first flow velocity, and a first inertia coefficient value of a flow channel of a battery pack thermal management system, and determining a first viscosity coefficient value based on the set flow resistance, the calculated flow resistance, the first flow velocity, and the first inertia coefficient value.

[0095] S520. Establish an initial model for flow field simulation of the liquid cooling system of the battery exchange device according to the first inertia coefficient value and the first viscosity coefficient value.

[0096] S530, calculating a first simulated flow resistance of a flow channel of the battery pack thermal management system under at least two flow rates according to a battery pack thermal management system model simulation.

[0097] Specifically, at least two working conditions with different flow rates are set, and the first simulated flow resistance of the flow channel of the battery pack thermal management system corresponding to each flow rate is calculated according to the existing battery pack thermal management system model, and the second flow rate corresponding to each flow rate and the second simulated flow resistance of the configuration pipeline corresponding to the flow channel of the battery pack thermal management system under each flow rate can be calculated. By setting at least two flow conditions, at least two sets of data on the first simulated flow resistance, the second simulated flow resistance and the second flow rate can be obtained.

[0098] S540, calculating a second inertia coefficient value and a second viscosity coefficient value according to the first simulated flow resistance and the second simulated flow resistance corresponding to each flow rate and the second flow velocity corresponding to each flow rate.

[0099] Specifically, the second inertia coefficient value and the second viscosity coefficient value can be calculated based on at least two sets of data of the first simulated flow resistance, the second simulated flow resistance and the second flow rate, that is, the first inertia coefficient value can be corrected to the second inertia coefficient value, and the first viscosity coefficient value can be corrected to the second viscosity coefficient value.

[0100] S550. Establish a correction model for flow field simulation of the liquid cooling system of the battery exchange device according to the second inertia coefficient value and the second viscosity coefficient value.

[0101] Based on the above technical solutions, Figure 6 yes Figure 5 The flowchart of the calculation method included in S540, optionally, see Figure 6 S540, calculating the second inertia coefficient value and the second viscosity coefficient value according to the first simulated flow resistance corresponding to each flow rate, the second simulated flow resistance and the second flow velocity corresponding to each flow rate includes:

[0102] S541. Determine the second medium boundary flow resistance corresponding to each flow rate according to the first simulated flow resistance and the second simulated flow resistance corresponding to each flow rate.

[0103] Specifically, the first simulated flow resistance corresponding to each flow rate is P1i, and the second simulated flow resistance of the configured pipeline corresponding to the flow channel of the battery pack thermal management system at each flow rate is P2i. The second medium boundary flow resistance corresponding to each flow rate can be calculated to be ΔP2=P1i-P2i.

[0104] S542. Determine a relationship between the second medium boundary flow resistance and the second flow velocity.

[0105] Specifically, the second flow velocity corresponding to each flow rate is u2i, then the second medium boundary flow resistance ΔP2 = ρ × (α2 × i2i + β2) × u2i + c, so that the quadratic function relationship of the second medium boundary flow resistance with respect to the second flow velocity can be obtained, wherein c represents a constant, α2 is the second inertia coefficient value, and β2 is the first viscosity coefficient value. When the flow rate is 0, the second medium boundary flow resistance is 0, so substituting the flow rate of 0 into the relationship, it can be seen that the constant c is 0, so the relationship between the second medium boundary flow resistance and the second flow resistance is ΔP2 = ρ × (α2 × u2i + β2) × u2i, so that the relationship between the second medium boundary flow resistance and the second flow velocity can be determined.

[0106] S543. Calculate the second inertia coefficient value and the second viscosity coefficient value according to the relationship.

[0107] Specifically, the second flow velocity corresponding to each flow rate and the second medium boundary flow resistance corresponding to each flow rate are substituted into the relationship, and the second inertia coefficient value α2 and the second viscosity coefficient value β2 can be calculated using two sets of data, so that the first inertia coefficient value α1 can be corrected to the second inertia coefficient value α2, and the first viscosity coefficient value β1 can be corrected to the second viscosity coefficient value β2.

[0108] The technical solution of this embodiment can determine the relationship between the second medium boundary flow resistance and the second flow velocity by performing simulation calculations on the existing battery pack thermal management system model under different working conditions. The second flow velocity corresponding to each flow rate and the second medium boundary flow resistance corresponding to each flow rate are substituted into the relationship to calculate the second inertia coefficient value and the second viscosity coefficient value, so that the first inertia coefficient value can be corrected to the second inertia coefficient value, and the first viscosity coefficient value can be corrected to the second viscosity coefficient value.

[0109] Figure 7 is a flowchart of another method for establishing a flow field simulation model of a liquid cooling system of a battery swap device provided by an embodiment of the present invention. Optionally, see Figure 7 , the method for establishing the flow field simulation model of the liquid cooling system of the battery swapping device includes:

[0110] S610, obtaining a set flow resistance, a calculated flow resistance, a first flow velocity, and a first inertia coefficient value of a flow channel of a battery pack thermal management system, and determining a first viscosity coefficient value based on the set flow resistance, the calculated flow resistance, the first flow velocity, and the first inertia coefficient value.

[0111] S620. Establish an initial model for flow field simulation of the liquid cooling system of the battery exchange device according to the first inertia coefficient value and the first viscosity coefficient value.

[0112] S630. Calculate the third simulated flow resistance of the flow channel of the battery pack thermal management system based on the initial model simulation, calculate the fourth simulated flow resistance of the flow field of the liquid cooling system of the battery swap device, and determine the uniformity of the first flow field of the liquid cooling system of the battery swap device.

[0113] Specifically, by performing simulation calculations based on the initial model, the medium boundary flow resistance ΔP3 can be obtained, and the flow resistance P3' of the configuration pipeline corresponding to the flow channel of the battery pack thermal management system can be calculated. The third simulated flow resistance P3 of the flow channel of the battery pack thermal management system can be obtained by adding the medium boundary flow resistance ΔP3 to the flow resistance P3' of the configuration pipeline, that is, P3 = P3' + ΔP3. In addition, by performing simulation calculations on the initial model, the fourth simulated flow resistance of the flow field of the liquid cooling system of the battery swap device and the uniformity of the first flow field of the liquid cooling system of the battery swap device can also be determined.

[0114] S640. Perform physical testing on the liquid cooling system of the battery swap device to obtain the first physical flow resistance of the flow channel of the battery pack thermal management system, the second physical flow resistance of the liquid cooling system of the battery swap device, and the second flow field uniformity of the liquid cooling system of the battery swap device.

[0115] Specifically, a physical test is performed on the liquid cooling system of the battery swapping device. The liquid cooling system of the battery swapping device includes the flow channel of the battery pack thermal management system. Therefore, the first physical flow resistance of the flow channel of the battery pack thermal management system can be directly measured, and the second physical flow resistance and the uniformity of the second flow field of the liquid cooling system flow field of the battery swapping device can also be measured.

[0116] S650. When it is determined that the difference between the first physical flow resistance and the third simulated flow resistance is greater than the first preset difference, or the difference between the second physical flow resistance and the fourth simulated flow resistance is greater than the second preset difference, or the difference between the second flow field uniformity and the first flow field uniformity is greater than the third preset difference, the first inertia coefficient value is corrected to the second inertia coefficient value, and the first viscosity coefficient value is corrected to the second viscosity coefficient value according to the first physical flow resistance, the second physical flow resistance or the second flow field uniformity.

[0117] Specifically, by subtracting the third simulated flow resistance of the flow channel of the battery pack thermal management system calculated by simulation from the first physical flow resistance of the flow channel of the battery pack thermal management system obtained by physical testing, if the difference between the third simulated flow resistance and the first physical flow resistance is less than the preset difference, it indicates that the first inertia coefficient value and the first viscosity coefficient value are in line with the actual situation, and the first inertia coefficient value and the first viscosity coefficient value do not need to be corrected; if the difference between the third simulated flow resistance and the first physical flow resistance is greater than the first preset difference, it indicates that the error of the flow resistance of the flow channel of the battery pack thermal management system calculated by simulation using the first inertia coefficient value and the first viscosity coefficient value is large, then the first inertia coefficient value can be corrected to the second inertia coefficient value according to the first physical flow resistance of the flow channel of the battery pack thermal management system obtained by physical testing, and the first viscosity coefficient value can be corrected to the second viscosity coefficient value. Alternatively, the fourth simulated flow resistance of the flow field of the liquid cooling system of the battery swap device calculated by simulation is subtracted from the second physical flow resistance of the liquid cooling system of the battery swap device in the actual test. If the difference is greater than the second preset difference, the first inertia coefficient value can be corrected to the second inertia coefficient value, and the first viscosity coefficient value can be corrected to the second viscosity coefficient value according to the second physical flow resistance of the liquid cooling system of the battery swap device in the actual test. Alternatively, the first flow field uniformity of the liquid cooling system of the battery swap device calculated by simulation is subtracted from the second flow field uniformity of the liquid cooling system of the battery swap device in the actual test. If the difference is greater than the third preset difference, the first inertia coefficient value can be corrected to the second inertia coefficient value according to the second flow field uniformity of the actual test, and the first viscosity coefficient value can be corrected to the second viscosity coefficient value.

[0118] S660. Establish a correction model for flow field simulation of the liquid cooling system of the battery exchange device according to the second inertia coefficient value and the second viscosity coefficient value.

[0119] The technical solution of this embodiment is to simulate using the initial model of the flow field simulation of the liquid cooling system of the battery swap device to obtain the third simulated flow resistance of the battery pack thermal management system, and then perform a physical test on the liquid cooling system of the battery swap device. If the difference between the third simulated flow resistance and the first physical flow resistance is greater than the first preset difference, it indicates that the error of the flow resistance of the flow channel of the battery pack thermal management system simulated and calculated using the first inertia coefficient value and the first viscosity coefficient value is large. Then, the first inertia coefficient value can be corrected to the second inertia coefficient value according to the first physical flow resistance of the flow channel of the battery pack thermal management system obtained from the physical test, and the first viscosity coefficient value can be corrected to the second viscosity coefficient value; or, the liquid cooling system of the battery swap device calculated by simulation can be corrected to the second viscosity coefficient value. The fourth simulated flow resistance of the system flow field is subtracted from the second physical flow resistance of the liquid cooling system of the battery swap device in the actual test. If the difference is greater than the second preset difference, the first inertia coefficient value can be corrected to the second inertia coefficient value according to the second physical flow resistance of the liquid cooling system of the battery swap device in the actual test, and the first viscosity coefficient value can be corrected to the second viscosity coefficient value; or, the first flow field uniformity of the battery swap device liquid cooling system calculated by simulation is subtracted from the second flow field uniformity of the battery swap device liquid cooling system in the actual test. If the difference is greater than the third preset difference, the first inertia coefficient value can be corrected to the second inertia coefficient value according to the second flow field uniformity of the actual test, and the first viscosity coefficient value can be corrected to the second viscosity coefficient value. In this way, a corrected model of the flow field simulation of the liquid cooling system of the battery swap device can be obtained. The corrected model of the liquid cooling system includes the model corresponding to the flow channel of the battery pack thermal management system. Therefore, simulating the corrected model can more accurately calculate the flow resistance of the liquid cooling system.

[0120] Figure 8 This is a schematic diagram of a structure of a device for establishing a flow field simulation model of a liquid cooling system of a battery swapping device provided by an embodiment of the present invention, see Figure 8 , the equipment for establishing the flow field simulation model of the liquid cooling system of the battery swapping device includes:

[0121] An initial value acquisition module 710, which is used to acquire a set flow resistance, a calculated flow resistance, a first flow velocity, and a first inertia coefficient value of a flow channel of a battery pack thermal management system, and determine a first viscosity coefficient value according to the set flow resistance, the calculated flow resistance, the first flow velocity, and the first inertia coefficient value;

[0122] An initial model building module 720, the initial model building module 720 is used to build an initial model for flow field simulation of the liquid cooling system of the battery swap device according to the first inertia coefficient value and the first viscosity coefficient value;

[0123] Correction module 730, correction module 730 is used to simulate the initial model, and perform a physical test on the liquid cooling system of the battery swap device, or simulate the battery pack thermal management system model, correct the first inertia coefficient value to the second inertia coefficient value, and correct the first viscosity coefficient value to the second viscosity coefficient value;

[0124] The correction model establishment module 740 is used to establish a correction model for the flow field simulation of the liquid cooling system of the battery exchange device according to the second inertia coefficient value and the second viscosity coefficient value.

[0125] The device for establishing a flow field simulation model of a liquid cooling system of a battery swapping device provided in this embodiment can implement the method for establishing a flow field simulation model of a liquid cooling system of a battery swapping device in the above-mentioned implementation mode. The implementation principle and technical effect of the device for establishing a flow field simulation model of a liquid cooling system of a battery swapping device provided in this implementation mode are similar to those in the above-mentioned implementation mode and will not be repeated here.

[0126] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A method for establishing a flow field simulation model of a liquid cooling system of a battery swapping device, characterized in that: include: Obtaining a set flow resistance, a calculated flow resistance, a first flow velocity, and a first inertia coefficient value of a flow channel of a battery pack thermal management system, and determining a first viscosity coefficient value according to the set flow resistance, the calculated flow resistance, the first flow velocity, and the first inertia coefficient value; Establishing an initial model for flow field simulation of a liquid cooling system of a battery swap device according to the first inertia coefficient value and the first viscosity coefficient value; Simulating the initial model, and performing a physical test on the liquid cooling system of the battery swapping device, or simulating the battery pack thermal management system model, correcting the first inertia coefficient value to the second inertia coefficient value, and correcting the first viscosity coefficient value to the second viscosity coefficient value; Establishing a correction model for flow field simulation of the liquid cooling system of the battery swap device according to the second inertia coefficient value and the second viscosity coefficient value; The initial model is simulated, and the liquid cooling system of the battery exchange device is physically tested, and the first inertia coefficient value is corrected to the second inertia coefficient value, and the first viscosity coefficient value is corrected to the second viscosity coefficient value, including: Calculate the third simulated flow resistance of the flow channel of the battery pack thermal management system according to the initial model simulation, calculate the fourth simulated flow resistance of the flow field of the liquid cooling system of the battery swap device, and determine the uniformity of the first flow field of the liquid cooling system of the battery swap device; Performing a physical test on the liquid cooling system of the battery swap device to obtain a first physical flow resistance of the flow channel of the battery pack thermal management system, a second physical flow resistance of the liquid cooling system of the battery swap device, and a second flow field uniformity of the liquid cooling system of the battery swap device; When the difference between the first physical flow resistance and the third simulated flow resistance is greater than the first preset difference, the first inertia coefficient value is corrected to the second inertia coefficient value according to the first physical flow resistance, and the first viscosity coefficient value is corrected to the second viscosity coefficient value; when the difference between the second physical flow resistance and the fourth simulated flow resistance is greater than the second preset difference, the first inertia coefficient value is corrected to the second inertia coefficient value according to the second physical flow resistance, and the first viscosity coefficient value is corrected to the second viscosity coefficient value; when the difference between the second flow field uniformity and the first flow field uniformity is greater than the third preset difference, the first inertia coefficient value is corrected to the second inertia coefficient value according to the second flow field uniformity, and the first viscosity coefficient value is corrected to the second viscosity coefficient value.

2. The method for establishing a flow field simulation model of a liquid cooling system of a battery swapping device according to claim 1, characterized in that: Determining a first viscosity coefficient value according to the set flow resistance, the calculated flow resistance, the first flow velocity, and the first inertia coefficient value includes: Determine the first medium boundary flow resistance according to the set flow resistance and the calculated flow resistance; A first viscosity coefficient value is determined according to the first flow velocity, the first medium boundary flow resistance, and a first inertia coefficient value.

3. The method for establishing a flow field simulation model of a liquid cooling system of a battery swapping device according to claim 1, characterized in that: Obtaining the set flow resistance, calculated flow resistance, first flow velocity and first inertia coefficient value of the flow channel of the battery pack thermal management system, including: Determine a configuration pipeline corresponding to the flow channel of the battery pack thermal management system; The set flow resistance of the flow channel of the battery pack thermal management system is obtained, and the calculated flow resistance, the first flow velocity and the first inertia coefficient value are obtained according to the configuration pipeline corresponding to the flow channel of the battery pack thermal management system.

4. The method for establishing a flow field simulation model of a liquid cooling system of a battery swapping device according to claim 3, characterized in that: Obtaining the calculated flow resistance, the first flow velocity, and the first inertia coefficient value according to the configuration pipeline corresponding to the flow channel of the battery pack thermal management system includes: Determine the flow rate of each branch of the configuration pipeline corresponding to the flow channel of the battery pack thermal management system according to the set flow rate; The first flow rate is determined according to the branch flow, and the calculated flow resistance is determined according to the branch flow.

5. The method for establishing a flow field simulation model of a liquid cooling system of a battery swapping device according to claim 3, characterized in that: The configuration pipeline corresponding to the flow channel of the battery pack thermal management system includes a straight pipe or a U-shaped pipe.

6. The method for establishing a flow field simulation model of a liquid cooling system of a battery swapping device according to claim 3, characterized in that: Before determining the configuration pipeline corresponding to the flow channel of the battery pack thermal management system, it also includes: Determine parameter information of the liquid cooling system of the battery exchange device; wherein the parameter information includes qualitative temperature, fluid medium, medium inlet position and medium outlet position.

7. The method for establishing a flow field simulation model of a liquid cooling system of a battery swapping device according to claim 1, characterized in that: The battery pack thermal management system model is simulated, the first inertia coefficient value is corrected to a second inertia coefficient value, and the first viscosity coefficient value is corrected to a second viscosity coefficient value, including: The first simulated flow resistance of the flow channel of the battery pack thermal management system under at least two flow rates is calculated according to the battery pack thermal management system model simulation; wherein at least two working conditions with different flow rates are set, and the first simulated flow resistance of the flow channel of the battery pack thermal management system corresponding to each flow rate is calculated according to the existing battery pack thermal management system model, and the second flow rate corresponding to each flow rate and the second simulated flow resistance of the configuration pipeline corresponding to the flow channel of the battery pack thermal management system under each flow rate are calculated; The second inertia coefficient value and the second viscosity coefficient value are calculated according to the first simulated flow resistance and the second simulated flow resistance corresponding to each flow rate and the second flow velocity corresponding to each flow rate.

8. The method for establishing a flow field simulation model of a liquid cooling system of a battery swapping device according to claim 7, characterized in that: Calculating the second inertia coefficient value and the second viscosity coefficient according to the first simulated flow resistance and the second simulated flow resistance corresponding to each flow rate and the second flow velocity corresponding to each flow rate includes: Determine the second medium boundary flow resistance corresponding to each flow rate according to the first simulated flow resistance and the second simulated flow resistance corresponding to each flow rate; Determine a relationship between the second medium boundary flow resistance and the second flow velocity; The second inertia coefficient value and the second viscosity coefficient value are calculated according to the relational expression.

9. A device for establishing a flow field simulation model of a liquid cooling system of a battery exchange device, characterized in that: include: An initial value acquisition module, the initial value acquisition module is used to obtain a set flow resistance, a calculated flow resistance, a first flow velocity and a first inertia coefficient value of a flow channel of a battery pack thermal management system, and determine a first viscosity coefficient value according to the set flow resistance, the calculated flow resistance, the first flow velocity and the first inertia coefficient value; An initial model building module, the initial model building module is used to build an initial model for flow field simulation of a liquid cooling system of a battery swap device according to the first inertia coefficient value and the first viscosity coefficient value; A correction module, the correction module is used to simulate the initial model, and perform a physical test on the liquid cooling system of the battery swap device, or simulate the battery pack thermal management system model, correct the first inertia coefficient value to a second inertia coefficient value, and correct the first viscosity coefficient value to a second viscosity coefficient value; A correction model establishment module, the correction model establishment module is used to establish a correction model for flow field simulation of the liquid cooling system of the battery exchange device according to the second inertia coefficient value and the second viscosity coefficient value; The initial model is simulated, and the liquid cooling system of the battery exchange device is physically tested, and the first inertia coefficient value is corrected to the second inertia coefficient value, and the first viscosity coefficient value is corrected to the second viscosity coefficient value, including: Calculate the third simulated flow resistance of the flow channel of the battery pack thermal management system according to the initial model simulation, calculate the fourth simulated flow resistance of the flow field of the liquid cooling system of the battery swap device, and determine the uniformity of the first flow field of the liquid cooling system of the battery swap device; Performing a physical test on the liquid cooling system of the battery swap device to obtain a first physical flow resistance of the flow channel of the battery pack thermal management system, a second physical flow resistance of the liquid cooling system of the battery swap device, and a second flow field uniformity of the liquid cooling system of the battery swap device; When the difference between the first physical flow resistance and the third simulated flow resistance is greater than the first preset difference, the first inertia coefficient value is corrected to the second inertia coefficient value according to the first physical flow resistance, and the first viscosity coefficient value is corrected to the second viscosity coefficient value; when the difference between the second physical flow resistance and the fourth simulated flow resistance is greater than the second preset difference, the first inertia coefficient value is corrected to the second inertia coefficient value according to the second physical flow resistance, and the first viscosity coefficient value is corrected to the second viscosity coefficient value; when the difference between the second flow field uniformity and the first flow field uniformity is greater than the third preset difference, the first inertia coefficient value is corrected to the second inertia coefficient value according to the second flow field uniformity, and the first viscosity coefficient value is corrected to the second viscosity coefficient value.

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