Laminar Textile Battery Electrode Covering
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Solution Overview
Problem
Existing materials used to cover pasty active mass on lead battery electrodes, such as paper and polyester nonwovens, fail to provide durable mechanical stabilization and can lead to short-circuiting and contamination due to disintegration and poor structural integrity in the presence of sulfuric acid and high temperatures.
Innovation Solution
A textile sheetlike material composed of a mixture of glass fibers and thermoplastic polymer fibers, with a binder, is used to create a durable covering layer that prevents the active mass from being washed away and maintains structural integrity throughout the battery's life, eliminating the need for additional stabilizing layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If paper is used as covering layer, then the active mass is mechanically stabilized, but the cellulose fibers dissolve in sulfuric acid and can no longer stabilize the active mass
Solution Approach 1:
The patent uses a composite covering layer made of glass fibers and polyester fibers. The glass fibers provide chemical resistance to sulfuric acid, while the polyester fibers provide mechanical strength and stabilization. This composite structure resolves the contradiction by combining materials with complementary properties - glass for chemical stability and polyester for mechanical support.
Solution Approach 2:
The patent changes the material parameters of the covering layer from natural cellulose (paper) to a synthetic composite (glass and polyester fibers). This parameter change - transitioning from organic to inorganic/synthetic materials - enables the covering layer to withstand the harsh chemical environment while maintaining mechanical stabilization function.
2Strength
If polyester nonwoven is used as covering layer, then the active mass is mechanically stabilized, but the polyester nonwoven disintegrates at high temperatures and leads to short-circuiting
Solution Approach 1:
The patent creates a composite covering layer where glass fibers provide thermal stability and resistance to disintegration at high temperatures, while polyester fibers maintain the mechanical stabilization function. The glass fiber component prevents the covering layer from disintegrating during overcharge conditions, eliminating the risk of fiber rise and short-circuiting.
Solution Approach 2:
The glass fibers act as an intermediary material that protects the polyester fiber matrix from thermal degradation. The glass fibers form a stable framework that maintains the structural integrity of the covering layer even when the polyester component is exposed to high temperatures, preventing disintegration and fiber migration.
3Stability of the object's composition
If glass fiber veil is used to coat active mass, then the structure is stable, but the open structure allows active mass to squeeze through and contaminate electrolyte
Solution Approach 1:
The patent combines glass fibers with polyester fibers to create a composite covering layer that maintains the chemical stability and structural integrity of glass while adding the mechanical properties needed to prevent active mass penetration. The composite structure provides both stability and appropriate density to block electrolyte contamination.
Solution Approach 2:
The patent optimizes the local properties of the covering layer by using a specific blend ratio of glass and polyester fibers. The glass fibers provide local chemical stability and structural framework, while the polyester fibers provide local mechanical strength and density. This local quality distribution prevents active mass from squeezing through while maintaining overall structural stability.
4Strength
If additional paper layer is applied for stabilization, then the active mass is more securely stabilized, but the device complexity increases
Solution Approach 1:
The patent eliminates the need for multiple separate layers by creating a single composite covering layer that integrates the functions of both chemical resistance and mechanical stabilization. The glass-polyester fiber composite provides both protection against acid degradation and adequate mechanical support, simplifying the structure to a single integrated layer instead of multiple functional layers.
Solution Approach 2:
The composite covering layer performs multiple functions simultaneously: it provides chemical resistance to sulfuric acid, mechanical stabilization of the active mass, and prevention of electrolyte contamination. This multi-functional design eliminates the need for additional specialized layers, reducing device complexity while maintaining comprehensive protection.
Data Source
AI summary
The invention relates to a laminar textile material for covering a pasty active mass on a battery electrode. The invention further relates to a battery electrode having such a material, to a battery, and to a method for producing battery electrodes. Potential improvements of lead batteries are disclosed that are more practical than previously known solutions, and that stabilize the pasty active mass on the battery electrodes. A laminar textile material is disclosed to this end, comprising glass fibers and fibers made of a thermoplastic, e.g. polyester.