Wireless Power Transfer Coil Radial Heat Release Segmentation
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Solution Overview
Problem
Existing wireless power transfer technologies for electric vehicles face inefficiencies in power transfer efficiency and heat management, particularly in solenoid type coils, leading to excessive Joule heat generation and limited cooling solutions for power reception coils.
Innovation Solution
A non-contact power transfer apparatus with a metallic heat release mechanism featuring a coil with multiple windings and heat release members divided by radial gaps, enhanced by a thermally conductive resin layer and magnetic shielding, to improve transfer efficiency and cooling effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If power transmission coil and power reception coil are used for wireless power transfer, then power transfer capability is improved, but Joule heat generation increases due to large current flow
Solution Approach 1:
The heat release member is divided into multiple segments along the radial direction of the coil winding, creating gaps between segments. This segmentation reduces eddy current formation while maintaining effective heat dissipation from the coil windings.
Solution Approach 2:
A thermally conductive resin layer is introduced as an intermediary between the coil winding and the heat release member. This layer improves thermal coupling for heat dissipation while providing electrical insulation to prevent current flow into the heat release structure.
2Temperature
If heat release member is applied to solenoid type coil, then heat dissipation is improved, but applicability to other coil types is limited
Solution Approach 1:
The heat release member design with radial segmentation and thermally conductive resin layering is configured to be applicable to various coil types including planar coils and solenoid coils, not limited to a single coil geometry. The structural principles can be adapted to different winding configurations.
3Loss of energy
If power transfer efficiency is improved by suppressing large current flow, then Joule heat generation is reduced, but charging speed may be affected
Solution Approach 1:
The gaps in the heat release member, which might seem to reduce thermal conductivity, actually benefit the system by suppressing eddy currents and their associated heat generation. This converts a potential thermal disadvantage into an electrical advantage, reducing energy loss without compromising charging performance.
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
The solution enhances power transfer efficiency while effectively cooling the power transfer apparatus, reducing Joule heat generation and improving heat dissipation, thus supporting efficient charging of electric vehicles.
Implementation Method 1
a thermally conductive resin layer and magnetic shielding, to improve transfer efficiency and cooling effectiveness
Implementation Method 2
it is required to efficiently cool the power reception coil by diffusing the generated Joule heat
Implementation Method 3
a metallic heat release means that cools the transfer means
Implementation Method 4
a research on using a power reception coil and a power transmission coil that face each other and are separated from each other, a so-called wireless power transfer has been conducted
Implementation Method 5
large Joule heat is generated in both of the power reception coil and the power transmission coil due to the large current
Data Source
AI summary
A power transfer apparatus capable of effectively cooling heat generated by wireless power transfer includes: a power transmission coil for performing wireless power transfer; and a heat-dissipating plate for cooling the power transmission coil, the heat-dissipating plate including heat-dissipating members or the like which are divided by gaps along the radial direction of a winding plane of a copper thin-film wire constituting the power transmission coil.