Electronics Housing Degassing Unit With Tunable Burst Pressure
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Solution Overview
Problem
Existing degassing units for electronics housings, particularly in high-voltage batteries, face challenges in achieving a precisely predefinable and low emergency degassing pressure due to material properties and manufacturing tolerances, leading to potential damage from pressure fluctuations and limited flexibility in burst pressure settings.
Innovation Solution
A degassing unit with a resiliently displaceable contact element between the emergency degassing mandrel and membrane, allowing adjustment of emergency degassing pressure through spring stiffness, reducing the influence of manufacturing tolerances and temperature variations, and enabling the use of various membrane materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed emergency degassing mandrel is used with a planar membrane, then the structure is simple, but the burst pressure cannot be precisely controlled and may cause damage under normal pressure fluctuations
Solution Approach 1:
The patent applies the dynamics principle by replacing the fixed mandrel with a resiliently displaceable contact element that can dynamically adjust its position. The contact element moves with the membrane during pressure changes, maintaining optimal contact distance and enabling precise burst pressure control through spring stiffness adjustment rather than fixed geometric constraints.
Solution Approach 2:
The patent implements parameter changes by making the contact element resiliently displaceable rather than fixed. This allows the system to change its mechanical parameters (position, contact force) in response to pressure variations, enabling precise control of burst pressure through material property selection and spring constant adjustment.
2Stress or pressure
If the mandrel is positioned very close to the membrane to achieve low burst pressure, then low burst pressure is achieved, but damage can occur under normal operating conditions due to pressure fluctuations
Solution Approach 1:
The patent applies beforehand cushioning by positioning the resilient contact element between the mandrel and membrane. This cushioning element absorbs normal pressure fluctuations and prevents direct contact between the mandrel and membrane during normal operation, while still enabling mandrel-membrane contact at the predetermined burst pressure when the cushioning element is compressed sufficiently.
Solution Approach 2:
The resilient contact element serves as an intermediary between the mandrel and membrane. It mediates the interaction by providing controlled compliance during normal operation and enabling precise force transmission at burst pressure, thereby protecting the membrane from damage while ensuring reliable emergency degassing.
3Manufacturing precision
If a resiliently displaceable contact element is introduced, then burst pressure precision is improved, but device complexity increases
Solution Approach 1:
The patent achieves precise burst pressure control through parameter changes in the spring constant and contact element geometry. By adjusting these parameters, the desired burst pressure can be precisely set without complex control systems, maintaining relative structural simplicity while achieving high precision through material and geometric parameter optimization.
4Adaptability or versatility
If different materials or mandrel positions are used for different burst pressures, then burst pressure adjustment is possible, but manufacturing complexity and tolerance accumulation increase
Solution Approach 1:
The patent enables burst pressure adjustment through parameter changes in the spring constant and contact element dimensions rather than changing materials or assembly positions. This approach maintains manufacturing simplicity by using the same basic structure with adjustable parameters, reducing tolerance accumulation and simplifying production while providing versatility in burst pressure settings.
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 achieves a precise and adjustable emergency degassing pressure with a maximum deviation of 10%, reducing the risk of membrane damage and allowing for lower burst pressures without increasing unit size, while enhancing flexibility and cost-effectiveness.
Implementation Method 1
a resiliently displaceable contact element between the emergency degassing mandrel and membrane
Implementation Method 2
This requires a deformation of the membrane due to the overpressure, so that the membrane contacts the mandrel at the desired burst pressure and bursts
Data Source
AI summary
A degassing unit for an electronics housing includes a base body fluid-tightly connectable to an edge of a pressure compensation opening of the electronics housing, the base body comprising a gas passage opening, a membrane covering the gas passage opening and being fluid-tightly connected to the base body in a region surrounding the gas passage opening, an emergency degassing mandrel comprising a tip pointing towards the membrane, a contact element being resiliently displaceable and disposed between the tip of the emergency degassing mandrel and the membrane in a non-operating state, a covering hood disposed on an exterior side of the base body, and a spring element for a resilient bearing of the contact element, the spring element being interposed between the covering hood and the contact element.