Conductive Contact Element with Liquid Cavity for Heat Dissipation
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Solution Overview
Problem
Electrical contact systems face challenges in maintaining low resistance and efficient heat dissipation, especially in high-current applications like electric vehicle charging, where contact resistance leads to excessive temperature and potential fires, due to the trade-off between conductivity and wear resistance, and the limitations of conventional materials in managing high power losses.
Innovation Solution
An electrical contact element with a conductive body featuring a closed cavity filled with a liquid or gaseous material at a temperature below the melting point of the solid material, which enhances heat dissipation through convective circulation and thermal conductivity, allowing for improved heat transport away from the contact surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the contact surface is coated with wear-resistant materials, then the resilience of the contact surfaces is increased, but the electrical conductivity is reduced
Solution Approach 1:
The contact element uses a composite structure combining a solid conductive material body (first material) with a liquid/gaseous conductive material (second material) in a closed cavity. This composite design allows the solid material to provide mechanical strength and wear resistance, while the liquid/gaseous material provides high electrical conductivity and heat dissipation, resolving the contradiction between wear resistance and conductivity.
Solution Approach 2:
The invention introduces a liquid or gaseous material into the contact element structure to serve dual purposes: maintaining electrical conductivity and enabling active heat dissipation through convective circulation. This pneumatic/hydraulic approach allows the system to achieve both wear resistance (through the solid structure) and high conductivity without the trade-off present in conventional coated contacts.
2Power
If high currents flow through the contact, then the charging power is increased, but the temperature on the contact surface increases sharply
Solution Approach 1:
The liquid or gaseous material in the closed cavity acts as a heat transfer medium that actively removes heat from the contact surface through convective circulation. This allows high charging currents to flow without excessive temperature buildup, as the fluid continuously absorbs and transports heat away from the contact zone, enabling high power transmission with effective thermal management.
Solution Approach 2:
The liquid/gaseous material may utilize phase transitions (evaporation/condensation cycles) as part of its heat dissipation mechanism. During phase change, the material absorbs latent heat from the contact surface, providing intense cooling capacity that enables high current flow without temperature exceedance, thereby supporting high charging power levels.
3Loss of energy
If the contact resistance is reduced, then the power loss is decreased, but the heat dissipation capability is not sufficiently improved
Solution Approach 1:
The liquid/gaseous material provides active heat dissipation through forced or natural convection currents within the closed cavity. This convective heat transfer mechanism continuously moves heat away from the contact surface, complementing the low contact resistance design. The system achieves both low energy loss (through minimized contact resistance) and superior heat dissipation (through fluid convection), resolving the limitation of conventional low-resistance contacts that still suffer from heat accumulation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design achieves reduced contact resistance and enhanced heat dissipation, preventing overheating and potential fires, while maintaining conductivity, even at high currents, and allows for smaller contact dimensions without compromising performance, thus optimizing charging efficiency and safety.
Implementation Method 1
enhances heat dissipation through convective circulation and thermal conductivity
Implementation Method 2
enhances heat dissipation through convective circulation and thermal conductivity
Implementation Method 3
a body made of an electrically conductive first material... filled with a second, electrically conductive material
Data Source
Figure 1
AI summary
An electrical contact element of a plug system for connecting an electrical device to a power supply comprises a body made of an electrically conductive first material, which has a first electrical contact surface at one end for establishing electrical contact with a second electrical contact element. The body has a closed cavity that extends from the first contact surface over at least part of the body's length. The cavity is at least partially filled with a second material that is liquid and/or gaseous at a temperature below the melting point of the first material.