Pressurized EV Charging Cable for MW Power Transfer
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Solution Overview
Problem
Current power cables for electric vehicles are limited to transferring electrical power up to 94 kW due to maximum voltage limits of 600-750 volts and 125 amperes, making it difficult to achieve MW-level power transfer without excessive heating or requiring multiple cables, and traditional fast charging methods are inefficient.
Innovation Solution
A power cable with a partially open enclosure and contactor that forms a fluid-tight coupling with a receiver, incorporating a pressure sensor to control electrical power supply based on fluid pressure inside the cavity, allowing for increased voltage and efficient power transfer without overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If voltage and current are increased beyond 600-750 volts and 125 amperes to achieve MW-level power transfer, then power transfer capability is improved, but excessive heating occurs and cable damage may result
Solution Approach 1:
The patent introduces a pressurized fluid environment within the cable enclosure to enable MW-level power transfer. The fluid medium (gas or liquid) is pressurized to increase the dielectric strength and thermal conductivity, allowing higher voltage and current transmission without excessive heating or arcing. This hydraulic/pneumatic approach transforms the cable's thermal and electrical management by using fluid dynamics to dissipate heat and insulate electrical components.
Solution Approach 2:
The patent changes the physical parameters of the cable environment by pressurizing the fluid medium and controlling its properties. By adjusting pressure, temperature, and fluid composition, the cable can operate at MW power levels without exceeding thermal limits. The pressure sensor and controller dynamically adjust these parameters to maintain optimal conditions for high-power transmission while preventing overheating.
2Power
If current is increased beyond 125 amperes to achieve higher power transfer, then power transfer capability is improved, but excessive heating occurs requiring coolant embedding which increases complexity
Solution Approach 1:
The pressurized fluid medium serves multiple functions simultaneously: it acts as a thermal conductor to dissipate heat, as a dielectric to insulate electrical components, and as a pressure medium to prevent arcing. This multi-functional approach eliminates the need for separate coolant channels and insulation structures, reducing overall cable complexity while enabling higher current transmission.
Solution Approach 2:
By using a pressurized fluid system, the patent replaces complex multi-component cooling structures with a unified hydraulic/pneumatic environment. The fluid circulation system provides both thermal management and electrical insulation, simplifying the cable design compared to traditional approaches requiring embedded coolant channels and multiple insulation layers.
3Power
If voltage is increased beyond 750 volts to achieve MW-level power transfer, then power transfer capability is improved, but breakdown voltage is exceeded due to finite gap between contactor surfaces
Solution Approach 1:
The pressurized fluid medium increases the dielectric strength between contactor surfaces, allowing voltage to exceed traditional 750V limits without breakdown. The high-pressure fluid fills and maintains the finite gap between contactor surfaces, preventing arcing and electrical breakdown while enabling MW-level power transmission at higher voltages.
Solution Approach 2:
By changing the pressure and composition parameters of the fluid medium, the patent dynamically adjusts the dielectric strength of the environment. Higher pressure and specific fluid compositions increase the breakdown voltage threshold, allowing safe operation at voltages well above 750V. The controller adjusts these parameters in real-time to maintain reliability during high-power transmission.
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
Enables efficient electrical power transfer at the MW level by maintaining a controlled fluid environment within the cable, reducing complexity and preventing overheating, thus facilitating rapid charging of electric vehicles and other high-power devices.
Implementation Method 1
the pressurized fluid environment aids in increasing a breakdown voltage between contactor surfaces
Implementation Method 2
the pressurized fluid environment aids in reducing an arc between the contactor surfaces
Implementation Method 3
an open end of the enclosure forms a fluid-tight coupling with the receiver and a cavity is defined between the enclosure and the receiver
Data Source
AI summary
A power cable is presented. The power cable includes a power link. The power cable further includes an enclosure coupled to the power link, where the enclosure is partially open. Moreover, the power cable includes a contactor disposed at least partially within the enclosure and electrically coupled to the power link, where the contactor is configured to be connected to a receiver such that an open end of the enclosure forms a fluid-tight coupling with the receiver and a cavity is defined between the enclosure and the receiver. A system including the power cable and a method for controlling a supply of an electrical power are also presented.