Bonding Element Venting for Battery Casing Overpressure Sealing
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Solution Overview
Problem
Existing overpressure protection systems for battery casings are complex, costly, and inflexible, often requiring specific designs for defined hole geometries, which limits their adaptability and increases manufacturing effort and weight, while also being prone to premature failure under high pressures.
Innovation Solution
A method using bonding elements with a pressure-sensitive adhesive layer and a weakened carrier layer that forms a fluid-tight seal and irreversibly opens at a predetermined pressure, allowing for flexible sealing of various hole geometries without the need for specific adaptations, reducing weight and manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complex overpressure protection systems are fitted into continuous clearances, then overpressure protection is achieved, but device complexity and manufacturing cost increase
Solution Approach 1:
The bonding element integrates multiple functions into a single component: it seals the continuous clearance fluid-tightly while simultaneously providing overpressure protection through the pressure opening region with weakened carrier layer. This merging eliminates the need for separate overpressure protection devices, reducing system complexity and manufacturing cost.
Solution Approach 2:
The bonding element serves dual purposes: permanent sealing of the continuous clearance and overpressure protection via the pressure opening region. This multi-functional design replaces specialized overpressure protection systems, simplifying the overall device structure while maintaining reliability.
2Reliability
If overpressure protection systems are fitted into continuous clearances, then overpressure protection is achieved, but manufacturing cost and effort increase
Solution Approach 1:
The bonding element combines sealing and overpressure protection functions in one component that is applied in a single manufacturing step. The weakened carrier layer with pressure opening region is integrated into the bonding element design, eliminating the need for separate assembly operations and reducing manufacturing complexity.
Solution Approach 2:
The pressure opening region with weakened carrier layer is pre-formed in the bonding element during its manufacturing process. This preliminary preparation of the overpressure protection structure eliminates the need for additional assembly steps when installing the bonding element, reducing manufacturing effort and cost.
3Reliability
If overpressure protection systems are designed for defined hole geometries, then overpressure protection is achieved, but adaptability to different dimensions is reduced
Solution Approach 1:
The bonding element design with pressure opening region in the carrier layer provides a universal solution that can adapt to different continuous clearance geometries and dimensions. The weakened carrier layer structure maintains its overpressure protection function across various applications without requiring geometry-specific design modifications.
Solution Approach 2:
The bonding element can be adapted to different hole geometries by modifying parameters such as the size and shape of the pressure opening region and the dimensions of the carrier layer, while maintaining the fundamental overpressure protection mechanism. This allows flexibility for different dimensions without compromising reliability.
4Adaptability or versatility
If bonding elements with weakened carrier layer are used, then adaptability to different hole geometries is improved, but structural integrity under pressure may be compromised
Solution Approach 1:
The carrier layer is designed with differentiated local properties: the majority of the carrier layer maintains full thickness and high strength for structural integrity and sealing, while the pressure opening region contains localized weakened areas with reduced thickness. This local quality differentiation allows the bonding element to adapt to different geometries while preserving overall structural strength under pressure.
Solution Approach 2:
The weakened carrier layer provides sufficient reduction in thickness only in the pressure opening region where overpressure protection is needed, while the rest of the carrier layer maintains full strength. This partial action approach ensures adaptability where required without compromising overall structural integrity.
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 provides reliable, long-lasting, and flexible overpressure protection with reduced weight and manufacturing costs, enabling efficient sealing and pressure equalization while maintaining structural integrity under high pressures, making it suitable for battery casings and other applications.
Implementation Method 1
a) producing or providing a bonding element comprising: i) an adhesive layer comprising an adhesive, ii) a carrier layer disposed on the adhesive layer
Implementation Method 2
the bonding element comprises a pressure opening region which is surrounded at least sectionally by a weakening region formed in the carrier layer, the mean thickness of the carrier layer in the weakening region being lower than the mean thickness of the carrier layer in the pressure opening region, wherein the bonding element is configured such that the action of a predetermined opening pressure on the pressure opening region at least partly irreversibly destroys the bonding element in the weakening region and forms a through hole
Data Source
AI summary
Methods may seal or seal a continuous clearance in a substrate and comprise a) producing or providing a bonding element comprising: i) an adhesive layer comprising an adhesive, ii) a carrier layer disposed on the adhesive layer and comprising a first carrier ply, and b) adhering the bonding element by means of the adhesive layer to the substrate, so that the bonding element completely covers the continuous clearance and the continuous clearance is fluid-tightly sealed by the bonding element. The bonding element comprises a pressure opening region which is surrounded at least sectionally by a weakening region formed in the carrier layer, the mean thickness of the carrier layer in the weakening region being lower than the mean thickness of the carrier layer in the pressure opening region.