Encapsulation Vent Openings for Low-Void PCB Soldering

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Solution Overview

Problem

Existing electronic devices face issues with solder voids and warpage due to CTE mismatch when soldered to printed circuit boards, which affects manufacturing efficiency and product quality.

Innovation Solution

The electronic device incorporates a solderable surface with surface openings and encapsulation material, featuring vent openings that extend through the encapsulation material to provide an outgassing path during soldering, thereby reducing solder voids and warpage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional soldering process is used without vent openings, then complete encapsulation of electronic components is achieved, but solder voids form and warpage occurs due to gas trapping

Engineering Contradiction:

Improvesolder joint qualityVSAvoidencapsulation structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The encapsulation material is segmented to include vent opening regions that allow gas escape paths. This segmentation creates controlled openings in the encapsulation structure without compromising the overall encapsulation function, enabling gas to escape during soldering while maintaining component protection.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The vent openings act as intermediary channels between the enclosed electronic components and the external environment. These openings provide a controlled pathway for gas to escape during soldering, mediating between the need for complete encapsulation and the need for gas release to prevent voids and warpage.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Manufacturing precision

If vent openings are added to encapsulation material, then solder voids and warpage are reduced, but manufacturing complexity increases

Engineering Contradiction:

Improvesolder joint precisionVSAvoidencapsulation manufacturing

Core Design Contradiction:

Manufacturing precisionVSEase of manufacture

Solution Approach 1:

The vent openings are incorporated into the encapsulation material during the molding process itself, rather than requiring subsequent machining or drilling operations. This preliminary action integrates the gas escape function into the base manufacturing process, reducing additional manufacturing steps and complexity.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The encapsulation material's physical or chemical parameters are modified to enable self-forming vent openings during curing or molding. By changing material properties such as viscosity, curing characteristics, or shrinkage behavior, the vent openings emerge naturally during manufacturing without requiring complex additional processes.

Inventive Principle:

Principle #35Parameter changes

3Object-generated harmful factors

If vent openings are created in encapsulation material, then gas escape paths are provided during soldering, but structural integrity may be compromised

Engineering Contradiction:

Improvegas accumulationVSAvoidencapsulation strength

Core Design Contradiction:

Object-generated harmful factorsVSStrength

Solution Approach 1:

The vent openings are localized to specific regions within the encapsulation material where they are least likely to compromise overall structural integrity. By concentrating openings in non-critical areas and maintaining full encapsulation in load-bearing regions, the design provides gas escape paths while preserving the mechanical strength needed to protect electronic components.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The encapsulation material is designed as a composite structure combining materials with different properties. One component provides mechanical strength and protection, while the other creates the vent opening structure. This composite approach allows the encapsulation to maintain integrity while providing controlled gas escape paths during soldering.

Inventive Principle:

Principle #40Composite materials

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 implementation of vent openings in electronic devices significantly reduces solder void concentrations and warpage, leading to improved manufacturing processes and enhanced product reliability.

Implementation Method 1

the at least one vent opening provides an outgassing path for gases generated from the solder material during the soldering act

Methodology Applied

Scientific EffectOutgassing:

Implementation Method 2

an encapsulation material, encapsulating at least one electronic component of the electronic device

Methodology Applied

Scientific EffectEncapsulation:

Data Source

PatentUS12334405B2Electronic devices including vent openings and associated methods

Publication Date: 2025.06.17 INFINEON TECHNOLOGIES AG

AI summary

An electronic device and method is disclosed. In one example, the electronic device includes a solderable surface and at least one surface opening arranged in the solderable surface. The electronic device further includes an encapsulation material, encapsulating at least one electronic component of the electronic device, and at least one vent opening arranged in an area of the surface opening and extending through the encapsulation material.