Method and device for evaluating performance of charging gun assembly

Abstract

This invention relates to the field of charging gun technology, and provides a performance evaluation method and device for a charging gun assembly. The method includes: establishing a charging gun model; using shell elements to simulate the thin-walled portion of the cable and beam elements to simulate the stranded conductors inside the cable, connecting the shell elements and beam elements through coupling constraints to establish a cable model; assembling the two models; performing mechanical simulation of the cable based on the cable model to evaluate the tensile and bending stiffness of the cable; performing drop simulation of the charging gun assembly based on the assembled model to evaluate the degree of damage to the charging gun assembly; and performing thermal simulation of the cable based on the cable model. This invention uses shell elements and beam elements to model the cable, thereby significantly reducing model complexity while preserving the key mechanical and thermal properties of the cable to the greatest extent. This not only improves simulation efficiency but also accurately simulates the internal stress and temperature rise distribution of the cable, ensuring the accuracy of the overall evaluation of the charging gun.

Description

Technical Field

[0001] This invention relates to the field of charging gun technology, and specifically to a performance evaluation method and a performance evaluation device for a charging gun assembly. Background Technology

[0002] With the rapid development of the new energy vehicle industry, charging guns and cables, as key components connecting vehicles and charging stations, directly affect user safety and user experience due to their structure and temperature rise reliability. In real-world applications, charging cables are subjected to high current, dragging, and bending conditions over extended periods, and charging guns are prone to accidental drops. Therefore, it is essential to conduct drop tests on charging guns and stress and thermal effect tests on cables before product launch, and to evaluate product performance based on the test results.

[0003] Currently, some testing methods use physical testing methods, which involve using physical charging gun assemblies for testing. However, this method is costly, time-consuming, and difficult to cover all operating conditions.

[0004] Among related technologies, there are schemes that use full solid modeling and finite element method for simulation analysis. While this scheme can partially replace physical testing, it still has the following problems in practical applications. Specifically, the internal structure of charging cables is complex and has a very high aspect ratio. Full solid modeling of the complex internal structure of the cable results in an abnormally large number of elements and nodes in the model, usually reaching hundreds of thousands or even millions. This makes a single simulation calculation take hundreds of hours, resulting in extremely low simulation efficiency and failing to meet the needs of rapid product development iteration. Furthermore, in the drop simulation of charging guns, the analysis focus is on the structural response of the charging gun itself. The cable mainly plays the role of transmitting energy and constraining motion, and it is not the focus of the analysis. Full solid modeling of the complex internal structure of the cable will cause unnecessary waste of computational resources. Summary of the Invention

[0005] To address the technical problem of low efficiency and resource waste caused by excessive modeling of cable structures in charging gun simulation testing, the first aspect of this invention proposes a performance evaluation method for a charging gun assembly.

[0006] A second aspect of the present invention provides a performance evaluation device for a charging gun assembly.

[0007] The technical solution adopted in this invention is as follows:

[0008] A first aspect of the present invention provides a performance evaluation method for a charging gun assembly, comprising the following steps: Based on the ABAQUS (finite element analysis software) platform, importing the geometric model of the charging gun assembly to be tested; identifying key and non-key components of the charging gun assembly; the key components include a gun head and a gun shell; the non-key components include a cable; meshing the key components using tetrahedral solid elements; establishing the charging gun model using solid elements; simulating the thin-walled portion of the cable using shell elements; equivalently replacing the stranded conductors inside the cable using beam elements; coupling the nodes of the shell elements to the corresponding beam element nodes through coupling constraints; establishing a cable model according to a set cable length; and assembling the charging gun model and the cable model. The following steps are taken: An assembly model of the charging gun assembly is formed; mechanical simulation of the cable under different load conditions is performed based on the cable model; the strain distribution of the cable is obtained based on the mechanical simulation results, and the tensile stiffness and bending stiffness of the cable are evaluated based on the strain distribution; a drop simulation of the charging gun assembly at a set drop height is performed based on the assembly model of the charging gun assembly; the dynamic response of the charging gun assembly is obtained based on the drop simulation results, and the degree of damage to the charging gun assembly is evaluated based on the dynamic response; a thermal simulation of the cable is performed based on the cable model; the surface temperature of the cable and the temperature rise value and temperature rise rate of each core are obtained based on the thermal simulation results, and the thermal characteristics of the cable are evaluated based on the surface temperature of the cable and the temperature rise value and temperature rise rate of each core.

[0009] The performance evaluation method for the charging gun assembly proposed above in this invention may also have the following additional technical features:

[0010] According to one embodiment of the present invention, the beam element is a Timoshenko beam element.

[0011] According to an embodiment of the present invention, the mechanical simulation of the cable under different load conditions based on the cable model specifically includes: fixing one end of the cable model completely and coupling the other end to a reference point, releasing only the axial displacement degree of freedom, applying an axial displacement load, and performing mechanical simulation of the cable model under tensile conditions; coupling both ends of the cable model to the reference point and applying equal and opposite rotational angular displacements to the cable model respectively, and performing mechanical simulation of the cable model under bending conditions.

[0012] According to one embodiment of the present invention, a drop simulation of the charging gun assembly at a set drop height is performed based on the assembly model of the charging gun assembly. Specifically, this includes: assigning material properties to each component of the assembly model according to the actual situation of the charging gun assembly; setting the common contact force of each component of the assembly model; constraining all translational degrees of freedom at one end of the cable; applying a gravitational load to the entire assembly model; and simulating the drop of the charging gun assembly from the set drop height to a rigid plane.

[0013] According to one embodiment of the present invention, thermal simulation of the cable is performed based on the cable model, specifically including: setting the thermal conductivity, density and specific heat capacity of the beam unit and shell unit; setting the air domain and centering the cable model; and setting the heat generation rate of the unit corresponding to the cable core.

[0014] A second aspect of the present invention provides a performance evaluation device for a charging gun assembly, comprising: an import module, which is used to import a geometric model of the charging gun assembly to be tested based on the ABAQUS platform, identify key and non-key components of the charging gun assembly, wherein the key components include a gun head and a gun shell, and the non-key components include a cable; a first modeling module, which is used to mesh the key components using tetrahedral solid elements and to build the charging gun model using solid elements; a second modeling module, which is used to simulate the thin-walled portion of the cable using shell elements, and to equivalently replace the stranded conductors inside the cable using beam elements, and to couple the nodes of the shell elements to the corresponding beam element nodes through coupling constraints, and to build a cable model according to a set cable length; an assembly module, which is used to assemble the charging gun model and the cable model to form an assembly model of the charging gun assembly; and a first simulation module, which... The simulation module is used to perform mechanical simulation of the cable under different load conditions based on the cable model; the first evaluation module is used to obtain the strain distribution of the cable based on the mechanical simulation results, and evaluate the tensile stiffness and bending stiffness of the cable based on the strain distribution; the second simulation module is used to perform drop simulation of the charging gun assembly at a set drop height based on the assembly model of the charging gun assembly; the second evaluation module is used to obtain the dynamic response of the charging gun assembly based on the drop simulation results, and evaluate the damage degree of the charging gun assembly based on the dynamic response; the third simulation module is used to perform thermal simulation of the cable based on the cable model; the third evaluation module is used to obtain the surface temperature of the cable and the temperature rise value and temperature rise rate value of each core according to the thermal simulation results, and evaluate the thermal characteristics of the cable based on the surface temperature of the cable and the temperature rise value and temperature rise rate value of each core.

[0015] The performance evaluation device for the charging gun assembly described above in this invention also has the following additional technical features:

[0016] According to one embodiment of the present invention, the beam element is a Timoshenko beam element.

[0017] According to one embodiment of the present invention, the first simulation module is specifically used to: fix one end of the cable model completely and couple the other end to a reference point, release only the axial displacement degree of freedom, apply an axial displacement load, and perform mechanical simulation of the cable model under tensile conditions; couple both ends of the cable model to the reference point and apply rotational angular displacements of equal magnitude and opposite direction to the cable model to perform mechanical simulation of the cable model under bending conditions.

[0018] According to one embodiment of the present invention, the second simulation module is specifically used to: assign material properties to each component of the assembly model according to the actual situation of the charging gun assembly; set the general contact force of each component of the assembly model; constrain all translational degrees of freedom at one end of the cable; apply a gravitational load to the entire assembly model; and simulate the charging gun assembly falling from a set drop height onto a rigid plane.

[0019] According to one embodiment of the present invention, the second evaluation module is specifically used to: solve the dynamic response of the charging gun assembly using an explicit dynamic solver; obtain the strain and stress values ​​of each component of the assembly model based on the dynamic response; determine whether the component has a fracture risk and fracture area based on the strain and stress values; and evaluate the degree of damage to the charging gun assembly based on the fracture risk and fracture area.

[0020] According to one embodiment of the present invention, the third simulation module is specifically used for: setting the thermal conductivity, density and specific heat capacity of the beam unit and shell unit; setting the air domain and centering the cable model; and setting the heat generation rate of the unit corresponding to the core of the cable.

[0021] The beneficial effects of this invention are:

[0022] In cable modeling, this invention uses shell elements to simulate thin-walled structures and beam elements to represent internal conductors. Coupled elements are used to realize the internal contact transmission effect of the cable. This significantly reduces the model complexity and computational scale while preserving the key mechanical and thermal properties of the cable to the maximum extent. This not only improves the efficiency of model simulation but also accurately simulates the internal stress and temperature rise distribution of the cable, ensuring the accuracy of the overall evaluation of the charging gun. Attached Figure Description

[0023] Figure 1 This is a flowchart of a performance evaluation method for a charging gun assembly according to an embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of the structure of a charging gun assembly model according to an embodiment of the present invention;

[0025] Figure 3 This is a schematic cross-sectional view of a cable according to an embodiment of the present invention;

[0026] Figure 4 This is a schematic diagram of a cable model according to an embodiment of the present invention;

[0027] Figure 5 This is a schematic diagram of a drop simulation according to an embodiment of the present invention;

[0028] Figure 6 This is a block diagram of a performance evaluation device for a charging gun assembly according to an embodiment of the present invention. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Figure 1 This is a flowchart of a performance evaluation method for a charging gun assembly according to an embodiment of the present invention, such as... Figure 1 As shown, the method includes the following steps:

[0031] S1, based on the ABAQUS platform, imports the geometric model of the charging gun assembly to be tested, and identifies the key and non-key components of the charging gun assembly. Key components include: gun head and gun shell, and non-key components include: cables.

[0032] Specifically, such as Figure 2 As shown, in the ABAQUS software platform, the charging gun assembly model to be analyzed is identified. The model mainly includes the gun head 11, gun housing 12, mechanical locking bolt 13, tail clip 14 and cable 15. The gun head 11 and gun housing 12 are regarded as key components, while the cable 15, which affects the overall mechanical and thermal behavior, is regarded as a non-key component.

[0033] S2 uses tetrahedral solid elements to mesh key components and uses solid elements to build a charging gun model.

[0034] Specifically, tetrahedral solid elements are used to mesh key components, with the mesh of the gun head being refined.

[0035] S3 uses shell elements to simulate the thin-walled portion of the cable and beam elements to replace the stranded conductors inside the cable. The nodes of the shell elements are coupled to the corresponding nodes of the beam elements through coupling constraints. The cable model is then established based on the set cable length.

[0036] In one specific embodiment of the present invention, the beam element is a Timoshenko beam element.

[0037] Specifically, such as Figure 3 As shown, a cable typically includes: a sheath 21, stranded conductors 22, insulation layer 23, a small sheath 24 for the open wooden core, and filler 25. For example... Figure 4 As shown, a shell element 31 is used to simulate the thin-walled parts of the cable, such as the insulation layer and sheath. The shell element 31 has corresponding thickness and material properties. Beam elements 32 (such as B31) are used to equivalently replace the complex stranded conductor 22 inside the cable, simplifying it into a solid cylinder with an equivalent cross-sectional area. The beam element 32 can more accurately describe the complex stress state involving shear deformation and torsion, overcoming the limitations of the beam element 32 in contact simulation, and allowing the introduction of thermal parameters for heat transfer. To overcome the limitations of the beam element 32 in contact simulation, coupling constraints 33 connect the nodes of the shell element to the corresponding beam element nodes 34 to transfer contact forces. This allows the beam element to participate in contact calculations through the surrounding shell element, effectively solving the limitations of the beam element contact algorithm. Finally, the cable length is set according to the actual situation. According to the national standard GB / T 20234.1-2023, the cable length can be set to 2250mm. Therefore, a system can be established as follows: Figure 4 The cable model shown is used to significantly reduce model complexity and computational scale while preserving the key mechanical and thermal properties of the cable to the greatest extent.

[0038] S4. Assemble the charging gun model and cable model to form the assembly model of the charging gun assembly.

[0039] S5 performs mechanical simulations of cables under different load conditions based on a cable model.

[0040] S6: Obtain the strain distribution of the cable based on the mechanical simulation results of the cable, and evaluate the tensile stiffness and bending stiffness of the cable based on the strain distribution.

[0041] In a specific embodiment of the present invention, the mechanical simulation of the cable under different load conditions based on the cable model includes: fixing one end of the cable model completely and coupling the other end to a reference point, releasing only the axial displacement degree of freedom, applying an axial displacement load, and performing mechanical simulation of the cable model under tensile conditions; coupling both ends of the cable model to the reference point and applying equal and opposite rotational angular displacements to the cable model, and performing mechanical simulation of the cable model under bending conditions.

[0042] Specifically, load conditions and boundary conditions are set for the cable to perform mechanical simulations under different load conditions. One end of the cable model is completely fixed, while the other end is coupled to a reference point, releasing only the axial displacement degree of freedom. An axial displacement load is applied, thus performing mechanical simulations of the cable model under tensile conditions. Implicit calculations using statics are employed to obtain the relationship between elongation and applied force during the simulation, thereby evaluating the cable's tensile stiffness. Both ends of the cable model are coupled to the reference point, and equal but opposite rotational angular displacements are applied to each end to perform mechanical simulations of the cable model under bending conditions. Implicit calculations using statics are employed to obtain the relationship between bending and applied force during the simulation, thereby evaluating the cable's bending stiffness. Therefore, a cable model formed by a combination of beam and shell elements is used for mechanical simulations under tensile and bending conditions. This model not only accurately reflects the stress distribution of the cable but also has low data complexity and high computational efficiency, significantly improving simulation efficiency while ensuring accuracy.

[0043] S7, based on the assembly model of the charging gun assembly, performs drop simulation of the charging gun assembly at a set drop height.

[0044] In one specific embodiment of the present invention, a drop simulation of the charging gun assembly at a set drop height is performed based on the assembly model of the charging gun assembly. Specifically, this includes: assigning material properties to each component of the assembly model according to the actual situation of the charging gun assembly; setting the general contact force of each component of the assembly model; constraining all translational degrees of freedom at one end of the cable; applying a gravitational load to the entire assembly model; and simulating the drop of the charging gun assembly from the set drop height to a rigid plane.

[0045] S8: Obtain the dynamic response of the charging gun assembly based on the drop simulation results, and evaluate the damage degree of the charging gun assembly based on the dynamic response.

[0046] In one specific embodiment of the present invention, the dynamic response of the charging gun assembly is obtained based on the drop simulation results, and the damage degree of the charging gun assembly is evaluated based on the dynamic response. Specifically, this includes: solving the dynamic response of the charging gun assembly using an explicit dynamic solver; obtaining the strain and stress values ​​of each component of the assembly model based on the dynamic response; determining whether the component has a fracture risk and fracture area based on the strain and stress values; and evaluating the damage degree of the charging gun assembly based on the fracture risk and fracture area.

[0047] Specifically, based on the national standard GB / T 20234.1-2023, the total cable length L is set to 2250mm, and the drop height H is set to 1000mm, such as... Figure 5As shown, one end of the cable is fixed, and the other end is connected to the charging gun. Based on the specifications of the charging gun and cable manufacturer, the components of the assembly model of the charging gun assembly are assigned actual material properties. Universal contact is set, with a penalty function for tangential behavior, a friction coefficient set, and hard contact for normal behavior. All translational degrees of freedom at one end of the cable are constrained, and a gravitational load g, g = 9.8 m / s², is applied to the entire model to simulate the process of falling from a height of 1 meter onto a rigid plane.

[0048] The calculation is performed using an explicit dynamics solver. The input parameters are the gravity load g, the solution time (usually set to the free fall time corresponding to the drop height plus the damping decay time after the impact, typically 0.5-1 seconds), mass scaling (increasing the settling time increment by adjusting the density of some elements; the target time increment is recommended to be 10-50 times the natural settling time increment), and general contact (mainly the friction coefficient, determined according to cable specifications, typically set to 0.3). The output parameters are the dynamic response of the assembly model, including displacement, velocity, acceleration, stress, strain, and contact pressure. The solution method utilizes an explicit time integration strategy to solve the object's equations of motion, employing the central difference method to calculate the object's state at each moment.

[0049] The strain and stress values ​​of each component in the assembly model are obtained based on the solved dynamic response. When the strain and stress values ​​of a component exceed the material's fracture strain, a fracture risk is considered to exist at that location. Simultaneously, the degree of damage to the charging gun assembly is determined by the size of the fracture area; generally, a larger fracture area indicates a higher degree of damage. Technicians can assess the drop risk based on the degree of damage, facilitating product optimization. For example, if the damage level is higher than expected, it indicates a higher risk of damage if the charging gun is dropped during use, requiring further optimization of the charging gun's structure and materials to reduce this risk.

[0050] S9 performs thermal simulation of cables based on a cable model.

[0051] S10: Obtain the surface temperature of the cable and the temperature rise value and temperature rise rate of each core based on the thermal simulation results, and evaluate the thermal characteristics of the cable based on the surface temperature of the cable and the temperature rise value and temperature rise rate of each core.

[0052] In a specific embodiment of the present invention, thermal simulation of the cable is performed based on the cable model, which specifically includes: setting the thermal conductivity, density and specific heat capacity of the beam unit and the shell unit; setting the air domain and centering the cable model; and setting the heat generation rate of the unit corresponding to the core of the cable.

[0053] Specifically, the thermal conductivity, density, and specific heat capacity of the beam and shell elements of the cable model, as well as the thermal conductivity between each node, are set. An air domain approximately 30 times the size of the cable model is set to center the cable model, and the heat generation rate of the corresponding element for the heating core is set. An implicit solver is used for calculation to complete the thermal simulation analysis of the cable model, calculating the cable surface temperature and the temperature rise and rate of temperature rise of each core to evaluate the thermal characteristics of the cable. For example, if the cable surface temperature, core temperature rise, or temperature rise rate exceeds the expected value, it indicates that the thermal characteristics of the cable have not met expectations, and further optimization of the cable is required. Therefore, a cable model formed by combining beam and shell elements is used for cable thermal simulation. This model not only accurately reflects the cable surface temperature and the temperature rise and rate of temperature rise of each core, but also has low data complexity and high computational efficiency, greatly improving simulation efficiency while ensuring simulation accuracy.

[0054] In summary, the performance evaluation method for the charging gun assembly according to the embodiments of the present invention uses shell elements to simulate thin-walled structures and beam elements to represent internal conductors during cable modeling. Coupled elements are used to realize the internal contact transmission effect of the cable. This significantly reduces the model complexity and computational scale while preserving the key mechanical and thermal properties of the cable to the maximum extent. It can not only improve the efficiency of model simulation, but also accurately simulate the internal stress and temperature rise distribution of the cable, ensuring the accuracy of the overall evaluation of the charging gun.

[0055] Corresponding to the performance evaluation method for the charging gun assembly described above, this invention also proposes a performance evaluation device for the charging gun assembly. Since the device embodiments of this invention correspond to the method embodiments described above, details not disclosed in the device embodiments can be found in the method embodiments described above, and will not be repeated here.

[0056] Figure 6 This is a block diagram of a performance evaluation device for a charging gun assembly according to an embodiment of the present invention, as shown below. Figure 6 As shown, the performance evaluation device includes: an import module 100, a first establishment module 200, a second establishment module 300, an assembly module 400, a first simulation module 500, a first evaluation module 600, a second simulation module 700, a second evaluation module 800, a third simulation module 900, and a third evaluation module 1000.

[0057] The module includes several modules: an import module 100, which imports the geometric model of the charging gun assembly under test using the ABAQUS platform, identifies key and non-key components of the charging gun assembly, including the gun head and gun shell, and the cable; a first modeling module 200, which meshes the key components using tetrahedral solid elements and creates a charging gun model using solid elements; a second modeling module 300, which uses shell elements to simulate the thin-walled portion of the cable, uses beam elements to equivalently replace the stranded conductors inside the cable, and couples the nodes of the shell elements to the corresponding beam element nodes through coupling constraints to create a cable model based on the set cable length; an assembly module 400, which assembles the charging gun model and the cable model to form an assembled model of the charging gun assembly; and a first simulation module 500, which simulates the charging gun assembly based on the cable model. The system performs mechanical simulations of the cable under different load conditions. The first evaluation module 600 obtains the strain distribution of the cable based on the mechanical simulation results, and evaluates the tensile and bending stiffness of the cable based on the strain distribution. The second simulation module 700 performs drop simulations of the charging gun assembly at a set drop height based on the assembly model of the charging gun assembly. The second evaluation module 800 obtains the dynamic response of the charging gun assembly based on the drop simulation results, and evaluates the degree of damage to the charging gun assembly based on the dynamic response. The third simulation module 900 performs thermal simulations of the cable based on the cable model. The third evaluation module 1000 obtains the surface temperature of the cable and the temperature rise value and temperature rise rate of each core based on the thermal simulation results, and evaluates the thermal characteristics of the cable based on the surface temperature of the cable and the temperature rise value and temperature rise rate of each core.

[0058] According to one embodiment of the present invention, the beam element is a Timoshenko beam element.

[0059] According to one embodiment of the present invention, the first simulation module 500 is specifically used to: fix one end of the cable model completely and couple the other end to a reference point, release only the axial displacement degree of freedom, apply an axial displacement load, and perform mechanical simulation of the cable model under tensile conditions; couple both ends of the cable model to the reference point and apply rotational angular displacements of equal magnitude and opposite direction to the cable model under bending conditions.

[0060] According to one embodiment of the present invention, the second simulation module 700 is specifically used to: assign material properties to each component of the assembly model according to the actual situation of the charging gun assembly; set the general contact force of each component of the assembly model; constrain all translational degrees of freedom at one end of the cable; apply a gravitational load to the entire assembly model; and simulate the charging gun assembly falling from a set drop height onto a rigid plane.

[0061] According to one embodiment of the present invention, the second evaluation module 800 is specifically used to: solve the dynamic response of the charging gun assembly using an explicit dynamic solver; obtain the strain and stress values ​​of each component of the assembly model based on the dynamic response; determine whether the component has a fracture risk and fracture area based on the strain and stress values; and evaluate the degree of damage to the charging gun assembly based on the fracture risk and fracture area.

[0062] According to one embodiment of the present invention, the third simulation module 900 is specifically used for: setting the thermal conductivity, density and specific heat capacity of the beam unit and the shell unit; setting the air domain and centering the cable model; and setting the heat generation rate of the unit corresponding to the core of the cable.

[0063] According to the performance evaluation device for the charging gun assembly of the present invention, when modeling the cable, shell elements are used to simulate thin-walled structures, beam elements are used to represent internal conductors, and coupling elements are used to realize the internal contact transmission effect of the cable. In this way, while preserving the key mechanical and thermal properties of the cable to the maximum extent, the complexity of the model and the scale of calculation are significantly reduced. This not only improves the efficiency of model simulation, but also accurately simulates the internal stress and temperature rise distribution of the cable, ensuring the accuracy of the overall evaluation of the charging gun.

[0064] In the description of this invention, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are 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.

[0065] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

[0066] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A performance evaluation method for a charging gun assembly, characterized in that, Includes the following steps: Based on the ABAQUS platform, the geometric model of the charging gun assembly to be tested is imported, and the key and non-key components of the charging gun assembly are identified. The key components include the gun head and the gun shell, and the non-key components include the cable. The key components are meshed using tetrahedral solid elements, and the charging gun model is built using solid elements. Shell elements are used to simulate the thin-walled portion of the cable, and beam elements are used to replace the stranded conductors inside the cable. The nodes of the shell elements are coupled to the corresponding nodes of the beam elements through coupling constraints. The cable model is established according to the set cable length. The charging gun model and the cable model are assembled to form an assembly model of the charging gun assembly; Based on the cable model, mechanical simulation of the cable under different load conditions is performed. The strain distribution of the cable is obtained based on the mechanical simulation results of the cable, and the tensile stiffness and bending stiffness of the cable are evaluated based on the strain distribution. Based on the assembly model of the charging gun assembly, a drop simulation of the charging gun assembly at a set drop height was performed. The dynamic response of the charging gun assembly is obtained based on the drop simulation results, and the degree of damage to the charging gun assembly is evaluated based on the dynamic response. Thermal simulation of the cable is performed based on the cable model. The surface temperature of the cable and the temperature rise and rate of rise of each core are obtained based on the thermal simulation results. The thermal characteristics of the cable are evaluated based on the surface temperature of the cable and the temperature rise and rate of rise of each core.

2. The performance evaluation method for the charging gun assembly according to claim 1, characterized in that, The beam element is a Timoshenko beam element.

3. The performance evaluation method for the charging gun assembly according to claim 1, characterized in that, Based on the cable model, mechanical simulations of the cable under different load conditions are performed, specifically including: One end of the cable model is completely fixed, and the other end is coupled to a reference point. Only the axial displacement degree of freedom is released, and an axial displacement load is applied to perform mechanical simulation of the cable model under tensile conditions. The two ends of the cable model are coupled to a reference point, and rotational angular displacements of equal magnitude and opposite direction are applied to the cable model to perform mechanical simulation under bending conditions.

4. The performance evaluation method for the charging gun assembly according to claim 3, characterized in that, Based on the assembly model of the charging gun assembly, a drop simulation of the charging gun assembly at a set drop height is performed, specifically including: Assign material properties to each component of the assembly model based on the actual condition of the charging gun assembly; Set the common contact force for each component of the assembly model; Constrain all translational degrees of freedom at one end of the cable, apply a gravitational load to the entire assembly model, and simulate the charging gun assembly falling from a set drop height onto a rigid plane.

5. The performance evaluation method for the charging gun assembly according to claim 4, characterized in that, The dynamic response of the charging gun assembly is obtained based on the drop simulation results, and the degree of damage to the charging gun assembly is evaluated based on the dynamic response, specifically including: The dynamic response of the charging gun assembly is solved using an explicit dynamics solver. The strain and stress values ​​of each component of the assembly model are obtained based on the dynamic response. The component is assessed for the risk of fracture and the fracture area based on the strain and stress values, and the degree of damage to the charging gun assembly is evaluated based on the fracture risk and fracture area.

6. The performance evaluation method for the charging gun assembly according to claim 1, characterized in that, Thermal simulation of the cable based on the cable model specifically includes: The thermal conductivity, density, and specific heat capacity of the beam unit and shell unit are set. Set the air zone and center the cable model; Set the heat generation rate of the unit corresponding to the wire core of the cable.

7. A performance evaluation device for a charging gun assembly, characterized in that, include: The import module is used to import the geometric model of the charging gun assembly to be tested based on the ABAQUS platform, and to identify the key and non-key components of the charging gun assembly. The key components include the gun head and the gun shell, and the non-key components include the cable. The first creation module is used to mesh the key components using tetrahedral solid elements and to create the charging gun model using solid elements. The second creation module is used to simulate the thin-walled part of the cable using shell elements, and to replace the stranded conductor inside the cable with beam elements. The nodes of the shell elements are coupled to the corresponding beam element nodes through coupling constraints, and a cable model is created according to the set cable length. An assembly module is used to assemble the charging gun model and the cable model to form an assembly model of the charging gun assembly. The first simulation module is used to perform mechanical simulation of the cable under different load conditions based on the cable model. The first evaluation module is used to obtain the strain distribution of the cable based on the mechanical simulation results of the cable, and to evaluate the tensile stiffness and bending stiffness of the cable based on the strain distribution. The second simulation module is used to perform drop simulation of the charging gun assembly at a set drop height based on the assembly model of the charging gun assembly. The second evaluation module is used to obtain the dynamic response of the charging gun assembly based on the drop simulation results, and to evaluate the degree of damage to the charging gun assembly based on the dynamic response. The third simulation module is used to perform thermal simulation of the cable based on the cable model. The third evaluation module is used to obtain the surface temperature of the cable and the temperature rise value and temperature rise rate value of each core based on the thermal simulation results, and to evaluate the thermal characteristics of the cable based on the surface temperature of the cable and the temperature rise value and temperature rise rate value of each core.

8. The performance evaluation device for the charging gun assembly according to claim 7, characterized in that, The beam element is a Timoshenko beam element.

9. The performance evaluation device for the charging gun assembly according to claim 7, characterized in that, The first simulation module is specifically used for: One end of the cable model is completely fixed, and the other end is coupled to a reference point. Only the axial displacement degree of freedom is released, and an axial displacement load is applied to perform mechanical simulation of the cable model under tensile conditions. The two ends of the cable model are coupled to a reference point, and rotational angular displacements of equal magnitude and opposite direction are applied to the cable model to perform mechanical simulation under bending conditions.

10. The performance evaluation device for the charging gun assembly according to claim 7, characterized in that, The second simulation module is specifically used for: Assign material properties to each component of the assembly model based on the actual condition of the charging gun assembly; Set the common contact force for each component of the assembly model; Constrain all translational degrees of freedom at one end of the cable, apply a gravitational load to the entire assembly model, and simulate the charging gun assembly falling from a set drop height onto a rigid plane.

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