Electronic Control Unit Thermal Management with Copper Heat Spreader

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Solution Overview

Problem

Existing electronic control units (ECUs) face challenges in uniform heat dissipation due to the use of inexpensive materials like aluminum, which has limited thermal conductivity, and passive thermal interface materials that lead to hot spots and performance degradation.

Innovation Solution

The proposed solution involves an electronic control unit design that includes a copper heat spreader layer between electrical components and the outer housing, along with a second heat spreader layer on the opposite side of the printed circuit board, both in contact with aluminum housings, and the use of thermal interface materials to enhance heat transfer.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If aluminum is used for the outer housing to reduce cost, then manufacturing cost is reduced, but thermal conductivity is insufficient leading to non-uniform heat dissipation

Engineering Contradiction:

Improvemanufacturing costVSAvoidheat dissipation uniformity

Core Design Contradiction:

Ease of manufactureVSTemperature

Solution Approach 1:

The patent applies composite materials by combining aluminum outer housing with copper heat spreader layers and thermal interface materials. The copper layers provide high thermal conductivity for uniform heat distribution, while the aluminum housing maintains cost-effectiveness. This composite structure resolves the contradiction between low cost and effective heat dissipation.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent introduces copper heat spreader layers as intermediary components between the electronic components and the aluminum housing. These intermediary layers act as thermal mediators that transfer and distribute heat uniformly across the housing surface, overcoming the limited thermal conductivity of aluminum while maintaining cost benefits.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Device complexity

If passive thermal interface materials are used to simplify cooling, then device complexity is reduced, but hot spots form causing performance degradation

Engineering Contradiction:

Improvecooling system complexityVSAvoidperformance stability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent uses composite thermal management structures combining copper heat spreader layers with thermal interface materials. This composite approach maintains passive cooling simplicity while achieving uniform heat distribution that prevents hot spots and ensures reliable performance.

Inventive Principle:

Principle #40Composite materials

3Temperature

If copper is used for the outer housing to improve thermal conductivity, then heat dissipation uniformity is improved, but manufacturing cost increases

Engineering Contradiction:

Improveheat dissipation uniformityVSAvoidmanufacturing cost

Core Design Contradiction:

TemperatureVSEase of manufacture

Solution Approach 1:

The patent implements a composite structure where copper heat spreader layers are integrated within an aluminum housing. This allows the system to achieve the thermal conductivity benefits of copper for uniform heat dissipation while maintaining the cost advantages of aluminum for the outer housing structure.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent applies local quality by placing copper heat spreader layers only in specific locations where heat generation occurs, rather than making the entire housing copper. This localized application of high-conductivity material achieves effective heat management while controlling overall manufacturing cost.

Inventive Principle:

Principle #3Local quality

4Temperature

If active cooling solutions with fans are used to enhance cooling, then heat dissipation efficiency is improved, but device complexity and packaging space increase

Engineering Contradiction:

Improveheat dissipation efficiencyVSAvoidcooling system complexity

Core Design Contradiction:

TemperatureVSDevice complexity

Solution Approach 1:

The patent introduces copper heat spreader layers as intermediary thermal management components that passively distribute heat uniformly across the aluminum housing. This intermediary approach achieves effective heat dissipation without requiring active cooling systems, maintaining simplicity while improving thermal performance.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 more uniform and efficient heat dissipation across the ECU, preventing hot spots and ensuring reliable performance while being cost-effective and compact.

Implementation Method 1

a copper heat spreader layer between electrical components and the outer housing... both in contact with aluminum housings

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Implementation Method 2

the use of thermal interface materials to enhance heat transfer

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Data Source

PatentUS20250169042A1Thermal management arrangement for an electronic control unit

Publication Date: 2025.05.22 ZF FRIEDRICHSHAFEN AG

AI summary

An electronic control unit is disclosed which comprises an outer housing, a printed circuit board, at least one electrical component connected to the printed circuit board, a heat spreader layer disposed between the electrical component and the outer housing and including at least a portion in contact with the outer housing, and a thermal interface material disposed between the heat spreader layer and the outer housing.