Battery Plug Seal Using Polypropylene and Polyisobutylene Mixture
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Sealing plugs for rechargeable batteries, particularly in motor vehicles and forklifts, experience a decrease in prestress and tightness over time, especially at high temperatures, leading to leaks.
Innovation Solution
A sealing plug with a seal made from a mixture of polypropylene or polyethylene and polyisobutylene, preferably in a ratio of 1:10, combined with additives like kaolin, carbon black, and hydrogen-treated petroleum distillate, which maintains prestress and tightness over a long period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a seal made of elastic material is used in the sealing plug, then the seal provides initial tightness and prestress, but the prestress drops over time especially at high temperatures, leading to leaks
Solution Approach 1:
The patent changes the material composition parameters of the seal by incorporating specific additives (polyisobutylene, silicon dioxide, titanium dioxide, zinc oxide, and hydrogen-treated petroleum distillate) into the polypropylene or polyethylene matrix. This compositional modification alters the physical and chemical properties of the seal material, enabling it to maintain prestress and elasticity over extended periods even under high-temperature conditions.
Solution Approach 2:
The patent creates a composite seal material by combining polypropylene or polyethylene with multiple functional additives. The base polymer provides structural integrity while the additives contribute specific properties: polyisobutylene enhances elasticity and stress retention, silicon dioxide and titanium dioxide improve thermal stability, zinc oxide acts as a stabilizer, and hydrogen-treated petroleum distillate lubricates and prevents material degradation. This composite structure resolves the contradiction by synergistically combining materials that collectively maintain both initial tightness and long-term prestress.
2Stability of the object's composition
If the seal material is exposed to high temperatures over time, then the material degrades and loses prestress, but increasing material stability may reduce initial sealing effectiveness
Solution Approach 1:
The patent optimizes the formulation parameters of the seal material by precisely controlling the types and quantities of additives. The hydrogen-treated petroleum distillate undergoes chemical parameter changes through hydrogenation, reducing its reactivity and improving thermal stability. Similarly, the inorganic additives (silicon dioxide, titanium dioxide, zinc oxide) are selected and dosed to provide thermal reinforcement without compromising the elastic recovery and sealing strength of the polymer matrix.
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 seal maintains high tightness and prestress for an extended duration, preventing leaks even after years, especially under high-temperature conditions.
Implementation Method 1
the seal has a mixture of polypropylene or polyethylene and polyisobutylene... the pre-stress of the seal of an installed sealing plug is retained even after years
Implementation Method 2
the seal is formed by at least one O-ring and/or a layer sprayed onto the outside of the sealing plug... made of an elastic material
Data Source
AI summary
The invention relates to a battery sealing plug with an external thread for installation, in particular for screwing into the opening of the battery cover, wherein the sealing plug has at least one gas-tight seal on the outside, wherein the seal comprises a mixture of polypropylene or polyethylene and polyisobutylene.