Application for reducing electrical contact impedance of electrical connection based on nano efficient conductive grease

Abstract

The invention discloses an application for reducing electrical contact resistance of electrical connection based on nano efficient conductive grease, and relates to the technical field of electricis.A sensor network is used for collecting contact resistance, temperature rise, wear rate and chemical corrosion sign data in real time, and a multi-physical field simulation model of heat, electricity and force fields is constructed to obtain a multi-physical-field simulation model of a multi-physical-field simulation model of a multi-physical-field simulation model of a multi-physical-field simulation model of a multi-physical-field simulation model; analyzing a current density concentration point, a temperature rise concentration point and a stress concentration point; secondly, in the aspect of material optimization, through the design of the composite coating, low-proportion precious metal is combined with a nano conductive material, the coating cost is reduced, and the conductivity, the wear resistance and the corrosion resistance are remarkably improved; meanwhile, nano high-efficiency conductive grease with high conductivity, thermal conductivity and corrosion resistance is introduced to fill a microcosmic gap of a contact interface; and aiming at the stress concentration area identified by simulation, the geometric shape of the contact finger is optimized, the curvature radius, the contact area and the contact index quantity are adjusted, the abrasion and the deformation are fundamentally reduced, and the service life of the equipment is prolonged.

Description

Technical Field

[0001] The invention relates to the field of electrical technology, in particular to an application of reducing electrical connection contact impedance based on nano high-efficiency conductive grease. Background Art

[0002] In electrical connection design, surface plating technology is one of the main means to reduce contact resistance. By plating highly conductive metal on the contact surface, the interface resistance is reduced and the conductivity is improved. At the same time, the oxidation resistance of the contact interface is enhanced. It is widely used in high-voltage equipment.

[0003] However, the actual working conditions of electrical connections are complex and changeable, and the contact interface is often affected by mechanical wear, thermal effects of current and chemical corrosion. In gas-insulated switchgear GIS, the decomposition products of SF6 gas will aggravate the corrosion of the coating and accelerate failure. Although the surface coating theoretically provides a low-impedance and high-stability solution, its actual performance is often limited by a variety of external factors. In order to deal with the problem of coating failure, some traditional methods include using thicker coatings, more corrosion-resistant coating designs, or using multi-layer coating structures to enhance the bonding strength between the coating and the substrate and delay mechanical peeling. In addition, some solutions enhance physical stability by increasing the normal pressure on the contact interface. It can improve the long-term stability of electrical contact by reducing micro-motion and contact resistance fluctuations; however, increasing the coating thickness will significantly increase the manufacturing cost, and the multi-layer structure may introduce internal stress, affecting the uniformity of contact performance; on the other hand, although increasing the normal pressure can reduce contact resistance in the short term, it will accelerate mechanical wear and shorten component life. At the same time, in some extreme environments, simple coatings or lubrication chemistries are difficult to solve corrosion problems. Therefore, electrical connection design needs to find a balance between performance optimization and cost control. A more durable and reliable application solution based on nano-high-efficiency conductive grease to reduce electrical connection electrical contact impedance is urgently needed to solve such problems. Summary of the invention

[0004] In view of the above existing problems, the present invention is proposed.

[0005] The present invention provides an application of reducing electrical contact impedance of electrical connection based on nano high-efficiency conductive grease to solve the problem that increasing the thickness of the coating will significantly increase the manufacturing cost, and the multi-layer structure may introduce internal stress, affecting the uniformity of contact performance; although increasing the normal pressure can reduce the contact resistance in the short term, it will accelerate mechanical wear and shorten the life of the component.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] The embodiment of the present invention provides an application of reducing electrical connection contact impedance based on nano high-efficiency conductive grease, which includes:

[0008] Step S1, collecting connection data of the contact interface in real time through a sensor network, including contact resistance, interface temperature rise, wear rate and chemical corrosion signs;

[0009] Step S2, based on the collected connection data, construct a multi-physics field simulation model of heat, electricity and force field, and identify the key factors affecting the contact performance by simulating and analyzing the current density distribution, temperature rise concentration points and stress concentration areas of the contact interface;

[0010] Step S3, adjusting the contact surface coating scheme according to the key factors obtained by simulation, and adopting a composite coating of low-proportion noble metal combined with nano-conductive materials; the contact surface coating adjustment scheme includes adjusting the coating thickness and layer structure to balance wear resistance, corrosion resistance and economy;

[0011] Step S4, adjusting the geometric design of the stylus finger for the stress concentration area identified by simulation in step S2, dispersing the pressure concentration point, and reducing wear and deformation;

[0012] Step S5, establishing a dynamic adjustment mechanism based on feedback control, and adjusting the pressure distribution of the contact fingers and the coverage of the conductive grease based on the contact resistance and temperature rise data monitored in real time in step S1.

[0013] As a preferred solution of the application of reducing electrical connection contact impedance based on nano high-efficiency conductive grease described in the present invention, the step of constructing a multi-physics field simulation model of heat, electricity and force field based on the collected connection data is as follows:

[0014] Define the key parameters for data collection, assuming that the contact resistance is R c , the temperature rise of the contact interface is ΔT, the interface friction coefficient is μ, and the rate coefficient of chemical corrosion is k c , using key parameters as input conditions, construct boundary conditions for the simulation model;

[0015] The thermal field equation is established. The heat conduction equation describes the temperature distribution of the interface. The formula of the thermal field equation is:

[0016]

[0017] Where k represents the thermal conductivity of the material, T is the temperature distribution, Q is the heat source term, ρ is the material density, c is the material specific heat capacity, and t is the time.

[0018] The electric field equation is established. The current density distribution is determined by the potential distribution. The electric field equation formula is:

[0019]

[0020] Where σ represents the material conductivity, V is the potential distribution,

[0021] The current density is

[0022] Where J is the current density, E is the electric field intensity,

[0023] Establish the force field equation and use the elastic mechanics equation to describe the interface stress distribution. The elastic mechanics equation formula is:

[0024]

[0025] Among them, σ f represents the stress tensor, F is the external force,

[0026] The relationship between stress and strain is σ f =D, where D is the elastic modulus matrix and ε is the strain.

[0027] As a preferred solution of the application of reducing electrical contact impedance of electrical connection based on nano high-efficiency conductive grease described in the present invention, the step of identifying the key factors affecting contact performance by simulating and analyzing the current density distribution, temperature rise concentration points and stress concentration areas of the contact interface is as follows:

[0028] Multi-physics coupling is performed to couple thermal, electrical, and force fields through the following conditions:

[0029] Thermal field and electric field: Q = J 2 / σ,

[0030] Thermal field and force field: thermal stress σ caused by temperature rise thermal =αΔT, where α is the coefficient of thermal expansion;

[0031] The equations of the discrete simulation model using the finite element method FEM are solved using COMSOL and ANSYS software to obtain the current density distribution J(x, y, z), the temperature rise concentration point T(x, y, z), and the stress concentration area σ f (x,y,z),

[0032] Through simulation results, analysis:

[0033] Is the current density concentration point directly related to the contact resistance?

[0034] Is there insufficient heat resistance in the area where the temperature rise is too high?

[0035] and whether areas of stress concentration lead to increased wear.

[0036] As a preferred solution for the application of reducing electrical contact impedance of electrical connection based on nano-high-efficiency conductive grease described in the present invention, wherein: in step S3, conductive grease is filled between adjacent contact interfaces, and the conductive grease adopts nano-high-efficiency conductive grease with high conductivity, thermal conductivity and corrosion resistance.

[0037] As a preferred solution of the application of reducing electrical contact impedance of electrical connection based on nano high-efficiency conductive grease described in the present invention, wherein: the step of adjusting the contact surface coating solution according to the key factors obtained by simulation is:

[0038] Determine the optimization goal, defined as:

[0039] Minimize contact resistance R c , improve wear resistance W r , improve corrosion resistance C r and reduce costs C;

[0040] Optimize the conductivity of the coating, assuming the ratio of precious metal is p m , the proportion of nano conductive materials is p n , the total conductivity of the coating is σ coating ,

[0041] σ coating =p m σ m +p n σ n ,

[0042] Among them, σ m is the conductivity of the noble metal, σ n is the conductivity of nano conductive materials;

[0043] Optimize the wear resistance of the coating. Assume that the coating thickness is d and the wear resistance of the coating satisfies W r ,

[0044] W r =k w ·d,

[0045] Among them, k w is the material wear resistance coefficient.

[0046] As a preferred solution of the application of reducing electrical contact impedance of electrical connection based on nano high-efficiency conductive grease described in the present invention, wherein: the step of adjusting the contact surface coating solution according to the key factors obtained by simulation also includes:

[0047] Optimize the corrosion resistance of the coating, and the corrosion resistance of the coating meets C r ,

[0048] C r =k c ·p m ,

[0049] Among them, k c is the corrosion resistance coefficient of precious metals,

[0050] Multi-objective optimization is performed through weighted objective function, and the multi-objective optimization is:

[0051]

[0052] Among them, w1, w2, w3, w4 are the weight coefficients corresponding to the optimization objectives.

[0053] As a preferred solution of the application of reducing electrical connection electrical contact impedance based on nano high-efficiency conductive grease described in the present invention, wherein: the step of adjusting the geometric design of the contact finger for the stress concentration area identified by simulation in step S2 is:

[0054] To optimize the stress distribution, assume the contact pressure of the finger is P, define the finger geometry design target as the dispersed stress concentration point, and the optimization formula is:

[0055]

[0056] Among them, σ max is the maximum stress, F is the contact force, A is the contact area,

[0057] Optimize the shape of the touch finger and adjust the curvature radius r of the touch finger. The adjustment formula is:

[0058]

[0059] Wherein, r is the radius of curvature of the stylus.

[0060] As a preferred solution of the application of reducing electrical connection electrical contact impedance based on nano high-efficiency conductive grease described in the present invention, wherein: the step of adjusting the geometric design of the contact finger for the stress concentration area identified by simulation in step S2 also includes:

[0061] Contact area adjustment: by increasing the touch index n or width w, the total contact area At is adjusted. The adjustment formula is:

[0062] At=n·w·l,

[0063] Where l is the finger length,

[0064] FEM is used to simulate stress distribution and verify the effectiveness of the optimized design.

[0065] As a preferred solution for the application of reducing electrical contact impedance of electrical connection based on nano high-efficiency conductive grease described in the present invention, the steps of establishing a dynamic adjustment mechanism based on feedback control and adjusting the pressure distribution of the contact finger and the coverage of the conductive grease based on the contact resistance and temperature rise data monitored in real time in step S1 are as follows:

[0066] Real-time monitoring of contact resistance Rc and temperature rise ΔT, establish a control function, the control function formula is:

[0067] ΔP=kr·Rc+kt·ΔT,

[0068] Where ΔP is the adjusted pressure distribution, kr, kt are the control gain coefficients,

[0069] Adjust the pressure distribution and adjust the finger pressure P according to the feedback value. The adjustment formula is:

[0070] P=P0+ΔP,

[0071] Among them, P0 is the initial pressure.

[0072] As a preferred solution for reducing the electrical contact impedance of electrical connections based on nano-efficient conductive grease described in the present invention, the step of establishing a dynamic adjustment mechanism based on feedback control, adjusting the pressure distribution of the contact finger and the coverage of the conductive grease based on the contact resistance and temperature rise data monitored in real time in step S1, further includes:

[0073] Adjust the conductive grease coverage, and adjust the conductive grease coverage ag in real time. The adjustment formula is:

[0074] Ag=kg·ΔT,

[0075] Where kg is the coverage adjustment factor,

[0076] Use PID controller for dynamic adjustment.

[0077] The beneficial effects of the present invention are:

[0078] The present invention uses a sensor network to collect data on contact resistance, temperature rise, wear rate and chemical corrosion signs in real time, and solves the problem of inaccurate problem identification in traditional optimization by constructing a multi-physics field simulation model of heat, electricity and force fields to analyze the current density concentration points, temperature rise concentration points and stress concentration points. Secondly, in terms of material optimization, through composite coating design, a low proportion of precious metals is combined with nano-conductive materials to reduce coating costs and significantly improve electrical conductivity, wear resistance and corrosion resistance. At the same time, nano-high-efficiency conductive grease with high electrical conductivity, thermal conductivity and corrosion resistance is introduced to fill the microscopic gaps at the contact interface, further improving contact performance and thermal management capabilities.

[0079] The present invention optimizes the geometric shape of the contact finger according to the stress concentration area identified by simulation, including adjusting the curvature radius, contact area and contact finger quantity, thereby fundamentally reducing wear and deformation and extending the service life of the equipment; during operation, based on the real-time monitored contact resistance and temperature rise data, a feedback control mechanism is established to dynamically adjust the contact finger pressure distribution and the conductive grease coverage range to ensure the stability of the contact performance under dynamic conditions; in particular, it exhibits excellent adaptability under high load or extreme conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0080] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0081] Figure 1 The figure is a flow chart of the application method of the present invention for reducing the electrical contact impedance of the electrical connection. DETAILED DESCRIPTION

[0082] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0083] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0084] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0085] Example 1, reference Figure 1 This embodiment provides an application of reducing electrical connection contact impedance based on nano high-efficiency conductive grease, comprising the following steps:

[0086] Step S1, collecting connection data of the contact interface in real time through a sensor network, including contact resistance, interface temperature rise, wear rate and chemical corrosion signs;

[0087] Step S2, based on the collected connection data, construct a multi-physics field simulation model of heat, electricity and force field, and identify the key factors affecting the contact performance by simulating and analyzing the current density distribution, temperature rise concentration points and stress concentration areas of the contact interface;

[0088] Based on the collected connection data, the steps to build a multi-physics simulation model of thermal, electrical and force fields are as follows:

[0089] Define the key parameters for data collection, set the contact resistance as Rc, the temperature rise of the contact interface as ΔT, the interface friction coefficient as μ, and the rate coefficient of chemical corrosion as kc, use the key parameters as input conditions, and construct the boundary conditions of the simulation model;

[0090] The thermal field equation is established. The heat conduction equation describes the temperature distribution of the interface. The formula of the thermal field equation is:

[0091]

[0092] Where k represents the thermal conductivity of the material, T is the temperature distribution, Q is the heat source term, ρ is the material density, c is the material specific heat capacity, and t is the time.

[0093] The electric field equation is established. The current density distribution is determined by the potential distribution. The electric field equation formula is:

[0094]

[0095] Where σ represents the material conductivity, V is the potential distribution,

[0096] The current density is

[0097] Where J is the current density, E is the electric field intensity,

[0098] Establish the force field equation and use the elastic mechanics equation to describe the interface stress distribution. The elastic mechanics equation formula is:

[0099]

[0100] Among them, σ f represents the stress tensor, F is the external force,

[0101] The relationship between stress and strain is σ f =D, where D is the elastic modulus matrix and ε is the strain;

[0102] By simulating and analyzing the current density distribution, temperature rise concentration points and stress concentration areas of the contact interface, the steps to identify the key factors affecting the contact performance are as follows:

[0103] Multi-physics coupling is performed to couple thermal, electrical, and force fields through the following conditions:

[0104] Thermal field and electric field: Q = J 2 / σ,

[0105] Thermal field and force field: thermal stress σ caused by temperature rise thermal =αΔT, where α is the coefficient of thermal expansion;

[0106] The equations of the discrete simulation model using the finite element method FEM are solved using COMSOL and ANSYS software to obtain the current density distribution J(x,y,z), the temperature rise concentration point T(x,y,z), and the stress concentration area σf(x,y,z).

[0107] Through simulation results, analysis:

[0108] Is the current density concentration point directly related to the contact resistance?

[0109] Is there insufficient heat resistance in the area where the temperature rise is too high?

[0110] and whether areas of stress concentration lead to increased wear;

[0111] Specifically, through multi-physics field coupling analysis, combined with collected data and simulation models, the key factors affecting contact performance can be effectively identified.

[0112] Step S3, adjusting the contact surface coating scheme according to the key factors obtained by simulation, and adopting a composite coating of low-proportion noble metal combined with nano-conductive materials; the contact surface coating adjustment scheme includes adjusting the coating thickness and layer structure to balance wear resistance, corrosion resistance and economy;

[0113] In step S3, conductive grease is filled between adjacent contact interfaces, and the conductive grease adopts nano-high-efficiency conductive grease with high electrical conductivity, thermal conductivity and corrosion resistance;

[0114] According to the key factors obtained from the simulation, the steps to adjust the contact surface coating scheme are:

[0115] Determine the optimization goal, defined as:

[0116] Minimize contact resistance Rc, improve wear resistance Wr, improve corrosion resistance Cr and reduce cost C;

[0117] Optimize the conductivity of the coating, set the ratio of precious metal to pm, the ratio of nano conductive material to pn, and the total conductivity of the coating to σcoating.

[0118] σ coating =pmσ m +pnσ n ,

[0119] Among them, σ m is the conductivity of the noble metal, σ n is the conductivity of nano conductive materials;

[0120] Optimize the wear resistance of the coating. Assume that the coating thickness is d and the coating wear resistance satisfies Wr.

[0121] Wr=kw·d,

[0122] Among them, kw is the material wear resistance coefficient;

[0123] Based on the key factors obtained from the simulation, the steps to adjust the contact surface coating scheme also include:

[0124] Optimize the corrosion resistance of the coating, and the corrosion resistance of the coating meets Cr,

[0125] Cr=kc·pm,

[0126] Where kc is the corrosion resistance coefficient of precious metals,

[0127] Multi-objective optimization is performed through weighted objective function, and the multi-objective optimization is:

[0128]

[0129] Among them, w1, w2, w3, w4 are weight coefficients corresponding to the optimization objectives;

[0130] Specifically, the coating thickness and material ratio are adjusted based on the simulation data, and the conductivity, wear resistance, corrosion resistance and economy are comprehensively considered to develop the optimal composite coating solution.

[0131] Step S4, adjusting the geometric design of the stylus finger for the stress concentration area identified by simulation in step S2, dispersing the pressure concentration point, and reducing wear and deformation;

[0132] For the stress concentration area identified by simulation in step S2, the steps for adjusting the geometric design of the stylus finger are as follows:

[0133] To optimize the stress distribution, let the contact pressure of the finger be P, define the geometric design target of the finger as the dispersed stress concentration point, and the optimization formula is:

[0134]

[0135] Among them, σ max is the maximum stress, F is the contact force, A is the contact area,

[0136] Optimize the shape of the touch finger and adjust the curvature radius r of the touch finger. The adjustment formula is:

[0137]

[0138] Where r is the radius of curvature of the stylus finger,

[0139] The step of adjusting the geometric design of the contact finger for the stress concentration area identified by simulation in step S2 also includes:

[0140] Contact area adjustment: by increasing the touch index n or width w, the total contact area At is adjusted. The adjustment formula is:

[0141] At=n·w·l,

[0142] Where l is the finger length,

[0143] Use FEM to simulate stress distribution and verify the effectiveness of the optimized design;

[0144] Specifically, by adjusting the geometric design of the touch finger, including curvature and contact area, the pressure concentration points can be dispersed to reduce wear and deformation.

[0145] Step S5, establishing a dynamic adjustment mechanism based on feedback control, and adjusting the pressure distribution of the contact finger and the coverage of the conductive grease based on the contact resistance and temperature rise data monitored in real time in step S1;

[0146] A dynamic adjustment mechanism based on feedback control is established. Based on the contact resistance and temperature rise data monitored in real time in step S1, the steps for adjusting the pressure distribution of the contact finger and the coverage of the conductive grease are as follows:

[0147] Real-time monitoring of contact resistance Rc and temperature rise ΔT, establish a control function, the control function formula is:

[0148] ΔP=kr·Rc+kt·ΔT,

[0149] Where ΔP is the adjusted pressure distribution, kr, kt are the control gain coefficients,

[0150] Adjust the pressure distribution and adjust the finger pressure P according to the feedback value. The adjustment formula is:

[0151] P=P0+ΔP,

[0152] Where P0 is the initial pressure,

[0153] The step of establishing a dynamic adjustment mechanism based on feedback control, adjusting the pressure distribution of the contact finger and the coverage of the conductive grease based on the contact resistance and temperature rise data monitored in real time in step S1, also includes:

[0154] Adjust the conductive grease coverage, and adjust the conductive grease coverage Ag in real time. The adjustment formula is:

[0155] Ag=kg·ΔT,

[0156] Where kg is the coverage adjustment factor,

[0157] Use PID controller for dynamic adjustment;

[0158] Specifically, the feedback control mechanism combines real-time monitoring data to dynamically optimize the contact finger pressure and conductive grease distribution, effectively reducing contact resistance and improving performance stability.

[0159] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. An application of reducing electrical connection contact impedance based on nano high-efficiency conductive grease, characterized in that: The application steps include, Step S1, collecting connection data of the contact interface in real time through a sensor network, including contact resistance, interface temperature rise, wear rate and chemical corrosion signs; Step S2, based on the collected connection data, construct a multi-physics field simulation model of heat, electricity and force field, and identify the key factors affecting the contact performance by simulating and analyzing the current density distribution, temperature rise concentration points and stress concentration areas of the contact interface; Step S3, adjusting the contact surface coating scheme according to the key factors obtained by simulation, and using a composite coating of a low proportion of noble metal combined with nano-conductive materials; The contact surface coating adjustment program includes adjustments to the coating thickness and layer structure to balance wear resistance, corrosion resistance and economy; Step S4, adjusting the geometric design of the contact finger according to the stress concentration area identified by simulation in step S2; Step S5, establishing a dynamic adjustment mechanism based on feedback control, and adjusting the pressure distribution of the contact fingers and the coverage of the conductive grease based on the contact resistance and temperature rise data monitored in real time in step S1.

2. The application of reducing electrical connection contact impedance based on nano high-efficiency conductive grease as claimed in claim 1, characterized in that: The steps of constructing a multi-physics field simulation model of heat, electricity and force field based on the collected connection data are as follows: Define the key parameters for data collection, assuming that the contact resistance is R c , the temperature rise of the contact interface is ΔT, the interface friction coefficient is μ, and the rate coefficient of chemical corrosion is k c , using key parameters as input conditions, construct boundary conditions for the simulation model; The thermal field equation is established. The heat conduction equation describes the temperature distribution of the interface. The formula of the thermal field equation is: Where k represents the thermal conductivity of the material, T is the temperature distribution, Q is the heat source term, ρ is the material density, c is the material specific heat capacity, and t is the time. The electric field equation is established. The current density distribution is determined by the potential distribution. The electric field equation formula is: Where σ represents the material conductivity, V is the potential distribution, The current density is Where J is the current density, E is the electric field intensity, Establish the force field equation and use the elastic mechanics equation to describe the interface stress distribution. The elastic mechanics equation formula is: Among them, σ f represents the stress tensor, F is the external force, The relationship between stress and strain is σ f =D, where D is the elastic modulus matrix and ε is the strain.

3. The application of reducing electrical connection contact impedance based on nano high-efficiency conductive grease as claimed in claim 2, characterized in that: The steps of analyzing the current density distribution, temperature rise concentration points and stress concentration areas of the contact interface by simulation to identify the key factors affecting the contact performance are: Multi-physics coupling is performed to couple thermal, electrical, and force fields through the following conditions: Thermal field and electric field: Q = J 2 / σ, Thermal field and force field: thermal stress σ caused by temperature rise thermal =αΔT, where α is the coefficient of thermal expansion; The equations of the discrete simulation model using the finite element method FEM are solved using COMSOL and ANSYS software to obtain the current density distribution J(x, y, z), the temperature rise concentration point T(x, y, z), and the stress concentration area σ f (x,y,z), Through simulation results, analysis: Is the current density concentration point directly related to the contact resistance? Is there insufficient heat resistance in the area where the temperature rise is too high? and whether areas of stress concentration lead to increased wear.

4. The application of reducing electrical connection contact impedance based on nano high-efficiency conductive grease as claimed in claim 3, characterized in that: In step S3, conductive grease is filled between adjacent contact interfaces, and the conductive grease adopts nano-high-efficiency conductive grease with high electrical conductivity, thermal conductivity and corrosion resistance.

5. The application of reducing electrical connection contact impedance based on nano high-efficiency conductive grease as claimed in claim 4, characterized in that: The steps of adjusting the contact surface coating scheme according to the key factors obtained by simulation are: Determine the optimization goal, defined as: Minimize contact resistance R c , improve wear resistance W r , improve corrosion resistance C r and reduce costs C; Optimize the conductivity of the coating, assuming the ratio of precious metal is p m , the proportion of nano conductive materials is p n , the total conductivity of the coating is σ coating , s coating =p m s m +p n s n , Among them, σ m is the conductivity of the noble metal, σ n is the conductivity of nano conductive materials; Optimize the wear resistance of the coating. Assume that the coating thickness is d and the wear resistance of the coating satisfies W r , W r =k w ·d, Among them, k w is the material wear resistance coefficient.

6. The application of reducing electrical connection contact impedance based on nano high-efficiency conductive grease as claimed in claim 5, characterized in that: The step of adjusting the contact surface coating scheme according to the key factors obtained by simulation also includes: Optimize the corrosion resistance of the coating, and the corrosion resistance of the coating meets C r , C r =k c ·p m , Among them, k c is the corrosion resistance coefficient of precious metals, Multi-objective optimization is performed through weighted objective function, and the multi-objective optimization is: Among them, w1, w2, w3, w4 are the weight coefficients corresponding to the optimization objectives.

7. The application of reducing electrical connection contact impedance based on nano high-efficiency conductive grease as claimed in claim 6, characterized in that: The step of adjusting the geometric design of the contact finger for the stress concentration area identified by simulation in step S2 is: To optimize the stress distribution, assume the contact pressure of the finger is P, define the finger geometry design target as the dispersed stress concentration point, and the optimization formula is: Among them, σ max is the maximum stress, F is the contact force, A is the contact area, Optimize the shape of the touch finger and adjust the curvature radius r of the touch finger. The adjustment formula is: Where r is the radius of curvature of the stylus.

8. The application of reducing electrical connection contact impedance based on nano high-efficiency conductive grease as claimed in claim 7, characterized in that: The step of adjusting the geometric design of the contact finger for the stress concentration area identified by simulation in step S2 also includes: Contact area adjustment: by increasing the number of touch fingers n or width w, the total contact area A is adjusted t , the adjustment formula is: A t =n·w·l, Where l is the length of the finger.

9. The application of reducing electrical connection contact impedance based on nano high-efficiency conductive grease as claimed in claim 8, characterized in that: The steps of establishing a dynamic adjustment mechanism based on feedback control and adjusting the pressure distribution of the contact finger and the coverage of the conductive grease based on the contact resistance and temperature rise data monitored in real time in step S1 are as follows: Real-time monitoring of contact resistance R c and temperature rise ΔT, establish a control function, the control function formula is: ΔP=k r ·R c +k t ·ΔT, Where ΔP is the adjusted pressure distribution, k r ,k t is the control gain coefficient, Adjust the pressure distribution and adjust the finger pressure P according to the feedback value. The adjustment formula is: P=P0+ΔP, Among them, P0 is the initial pressure.

10. The application of reducing electrical connection contact impedance based on nano high-efficiency conductive grease as claimed in claim 9, characterized in that: The step of establishing a dynamic adjustment mechanism based on feedback control and adjusting the pressure distribution of the contact finger and the coverage of the conductive grease based on the contact resistance and temperature rise data monitored in real time in step S1 also includes: Adjust the conductive grease coverage, real-time adjustment of the conductive grease coverage A g , the adjustment formula is: A g =k g ·ΔT, Among them, k g is the coverage adjustment factor, Use PID controller for dynamic adjustment.

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