Sealed Screw Head Coating for Battery Housing Leak Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Screw connections in battery housings often result in leaky seals due to complex screw driving technology and large tolerances, leading to incomplete coverage and potential corrosion, which can compromise the integrity and longevity of energy storage devices.
Innovation Solution
A method involving the application of a viscous coating material using a double-strip technique with opposing inclinations to ensure complete coverage of screw heads, combined with a two-component adhesive for rapid curing, allowing for efficient sealing and protection against corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a single strip of coating material is applied over the screw head, then the application process is simple and fast, but the screw head is not completely covered due to tolerances and offset positioning
Solution Approach 1:
The coating application is divided into two separate strips applied at different inclinations. The first strip is applied at a first inclination to cover part of the screw head, and the second strip is applied at a second inclination (opposite to the first) to cover the remaining areas, ensuring complete coverage despite tolerances and offset positioning.
2Reliability
If reactive adhesive/sealant is used for sealing, then good sealing performance is achieved, but drying and curing time is very long (hours)
Solution Approach 1:
A non-reactive primer coating is applied first to create a sealed layer over the screw head and surrounding area. This preliminary coating provides immediate sealing without requiring long curing times, while subsequent reactive sealant layers can then be applied more efficiently since the primary sealing function is already established by the primer.
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 method provides a reliable, fast, and efficient sealing process that ensures air- and water-tightness, reducing the risk of corrosion and extending the lifespan of battery systems by ensuring complete wetting and adhesion of the screw heads, even in complex geometries.
Implementation Method 1
ensuring complete wetting and adhesion of the screw heads
Implementation Method 2
ensuring complete wetting and adhesion of the screw heads
Implementation Method 3
combined with a two-component adhesive for rapid curing
Data Source
AI summary
A method for covering a screw head of a screw which penetrates through a workpiece surface in a sealed manner by means of a viscous coating material is disclosed. The method includes the steps of applying a first strip of the viscous coating material onto the workpiece surface at a first inclination relative to the workpiece surface, the first strip of the viscous coating material, after having been applied, at most partially covering the screw head; and applying a second strip of the viscous coating material to the workpiece surface at a second inclination relative to the workpiece surface, the second strip of the viscous coating material, after having been applied, overlapping the first strip in such a way that the screw head is fully covered, the first inclination and the second inclination being opposite one another. The invention furthermore relates to an application system.