Wireless Charging Heat Conduction Plate Design

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Solution Overview

Problem

Conventional wireless charging devices suffer from poor heat dissipation, leading to reduced charging efficiency and safety risks due to heat accumulation during the charging process.

Innovation Solution

Incorporation of a heat conduction plate with a U-shaped design, made of copper, and ceramic thermal barriers, along with heat-conducting glue layers, to effectively transmit heat from the chip to the shell for release, enhancing heat dissipation and preventing heat accumulation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If wireless charging device uses conventional design without heat dissipation structure, then device structure is simple, but heat accumulates causing reduced charging efficiency and safety risks

Engineering Contradiction:
Improveheat dissipationVSAvoidstructure complexity
Core Design Contradiction:
TemperatureVSDevice complexity

Solution Approach 1:

The heat conduction plate integrates multiple functions: it serves as both a structural support component and a thermal management system. The plate combines copper regions (for heat conduction from charging coil) and aluminum regions (for heat dissipation to shell), merging thermal management functionality into the existing structural framework rather than adding separate heat sinks or cooling systems.

Inventive Principle:
Principle #5Merging (Combining)

Solution Approach 2:

The heat conduction plate uses composite material construction with different metal regions (copper and aluminum) having different thermal properties. The copper region provides excellent heat conduction from the charging coil, while the aluminum region facilitates heat dissipation to the shell, creating a functionally optimized composite structure that addresses thermal management challenges.

Inventive Principle:
Principle #40Composite materials

2Temperature

If heat conduction plate contacts chip directly, then heat transfer efficiency increases, but electromagnetic interference to chip increases

Engineering Contradiction:
Improveheat transfer efficiencyVSAvoidelectromagnetic interference
Core Design Contradiction:
TemperatureVSObject-affected harmful factors

Solution Approach 1:

The non-conductive layer acts as an intermediary between the heat conduction plate and the chip. This layer thermally couples the chip to the heat conduction plate for efficient heat transfer, while simultaneously providing electromagnetic isolation to prevent interference from the charging coil and circuit board traces from affecting the chip operation.

Inventive Principle:
Principle #24Intermediary (Mediator)

Solution Approach 2:

The heat conduction plate features localized functional regions: a copper region positioned to contact the charging coil for heat absorption, an aluminum region for heat dissipation, and a specifically positioned non-conductive layer where the chip contacts the plate. This local differentiation of material properties and functions optimizes both thermal management and electromagnetic shielding at specific locations.

Inventive Principle:
Principle #3Local quality

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 significantly improves heat dissipation, reducing heat accumulation and enhancing charging efficiency and safety by ensuring effective heat transfer from the chip to the shell for release, thereby maintaining high charging performance and safety.

Implementation Method 1

a heat conduction plate including a first portion, a second portion parallel with the first portion and contacted with an inner surface of the shell, and a third portion connecting a lower edge of the first portion to a lower edge of the second portion

Methodology Applied
Scientific EffectHeat conduction: Conduction (thermal)

Implementation Method 2

The working principle of the wireless charging device is based on radio waves and electromagnetic induction technology. Firstly a current is generated in the wireless charging device by the induction between the coil of the wireless charging device and the coil of an exterior charging device

Methodology Applied
Scientific EffectElectromagnetic induction: Electromagnetic Induction

Data Source

PatentEP2944074B1Wireless charging device and method using the same
Publication Date: 2017.08.30 BYD CO LTD
  • EP2944074B1 patent drawingFigure 1~2
  • EP2944074B1 patent drawingFigure 3~4

AI summary

A wireless charging device (100) includes a shell (1), a heat conduction plate (2), a charging assembly(4)and a connecting assembly(5).The heat conduction plate (2) includes a first portion (201), a second portion (202) parallel with the first portion (201) and contacted with an inner surface of the shell (1),and a third portion (203) connecting a lower edge of the first portion (201) to a lower edge of the second portion (202). The charging assembly(4)is disposed between the first and second portions (201,202) and includes a circuit board,a chip (401) disposed on the circuit board and contacted with the first portion (201),a charging coil and an exciting unit.The connecting assembly (5) defines a first end electrically connected with the circuit board.A method for charging an apparatus with the wireless charging device (100) is also provided.