Circuit Board Assembly Venting for Sealed Component Protection
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Solution Overview
Problem
Existing circuit board protection schemes in batteries and electrical devices are inadequate due to the limited thickness of conformal coatings, which affects the service life by exposing components to external damage and corrosion.
Innovation Solution
A circuit board assembly comprising a housing, insulation piece, and ventilation piece that forms a protected space around electronic components, with the insulation piece covering the components and the ventilation piece balancing air pressure to enhance protection against environmental factors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conformal coating is applied on the surface of components, then components are protected, but the protection is insufficient due to limited thickness affecting service life
Solution Approach 1:
The protection system is segmented into multiple independent protective elements: conformal coating (surface level), insulation pieces (component level), housing enclosures (assembly level), and ventilation pieces (environmental control). Each layer addresses specific protection needs, creating a hierarchical defense system that extends service life beyond what single-layer coating can provide
Solution Approach 2:
Protective structures are nested at multiple scales: conformal coating covers component surfaces, insulation pieces envelop individual components or groups, housing enclosures contain entire circuit boards, and ventilation pieces integrate within housing structures. This nested arrangement maximizes protection while minimizing space consumption, allowing thick protective layers without increasing overall device footprint
2Reliability
If insulation piece is made thicker to cover electronic component pins, then protection capability is improved, but device volume increases
Solution Approach 1:
Insulation pieces are designed with variable thickness and geometry tailored to specific local requirements: thicker regions where pins are exposed or corrosion risk is higher, thinner regions where components are already well-protected. This localized approach provides maximum protection capability while minimizing overall material usage and device volume
Solution Approach 2:
Protection is extended from two-dimensional conformal coating to three-dimensional insulation structures that wrap around components. By utilizing vertical and lateral dimensions, the insulation pieces create enclosed protective spaces without proportionally increasing device footprint, effectively adding protection volume efficiently
3Reliability
If circuit board is fully sealed to protect from external damage, then protection is improved, but air pressure imbalance may occur affecting component reliability
Solution Approach 1:
Ventilation pieces act as intermediary elements between the sealed internal environment and external atmosphere. These pieces selectively permit gas exchange to maintain pressure equilibrium while blocking liquid penetration and particulate ingress. The ventilation structure serves as a intelligent mediator that allows beneficial gas flow while excluding harmful contaminants
Solution Approach 2:
Ventilation pieces utilize flexible or porous membrane structures that can dynamically respond to pressure differences. These thin film or mesh structures expand or contract, open or close pores, to regulate gas flow and maintain pressure balance while providing continuous physical barrier against environmental damage
Data Source
AI summary
A circuit board assembly includes a circuit board, a first housing, a first insulation piece, and a first ventilation piece. The circuit board includes a first surface and a second surface disposed opposite to each other along a first direction. The circuit board further includes an electronic component on the first surface. The first housing includes a first recess. The circuit board is in the first recess. The first recess includes a first bottom wall. The second surface is oriented toward the first bottom wall. The first insulation piece is on the first surface and covers at least a part of the electronic component. The first insulation piece is connected to the first housing to form a first space. A projection of the first insulation piece overlaps a projection of the first space in the first direction. The first ventilation piece communicates the first space to an external space.