Secondary Battery Electrode Assembly for Deviation-Free Stacking
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Solution Overview
Problem
Conventional electrode assembly manufacturing methods face issues with electrode deviation during stacking, high heat and pressure causing breakage, and increased production costs due to the need for specialized adhesives that affect battery performance.
Innovation Solution
An electrode assembly with alternately stacked electrodes and separators, featuring a first adhesive between the electrodes and separator, and a second adhesive between adjacent separators, where the second adhesive is located outside the first adhesive, and is not dissolved in the electrolyte solution, to prevent deviation and improve adhesion without compromising battery performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a laminating process applying high heat and pressure is used to adhere electrodes and separators, then adhesion strength is improved, but electrode breakage occurs and manufacturing complexity increases
Solution Approach 1:
The patent changes the parameters of the adhesive itself by selecting materials with low glass transition temperature and low viscosity that can flow and adhere at room temperature, eliminating the need for high heat and pressure processing while achieving strong adhesion without electrode breakage
Solution Approach 2:
The patent uses conventional, inexpensive adhesives (such as acrylic-based adhesives) that can be easily applied and cured at room temperature, replacing expensive specialized adhesives and complex laminating processes, thereby reducing manufacturing cost and complexity while maintaining adhesion strength
2Manufacturing precision
If adhesive is applied on the electrode surface to prevent deviation, then positioning accuracy is improved, but battery performance deteriorates due to adhesive presence on electrode surface
Solution Approach 1:
The patent applies adhesive only at specific locations (edges or peripheral portions) of the electrode rather than covering the entire surface, ensuring that the adhesive provides positioning accuracy while the active electrode surface remains free of adhesive to maintain battery performance
Solution Approach 2:
The patent segments the adhesive application area from the active electrode area, using separate adhesive layers or patterns that are spatially distinct from the electrode's active surface, allowing both positioning and performance requirements to be satisfied simultaneously
3Strength
If specialized adhesives are used to achieve strong adhesion, then adhesion strength is improved, but production cost increases
Solution Approach 1:
The patent employs conventional, inexpensive adhesives that are readily available and do not require specialized procurement channels, significantly reducing material costs while achieving sufficient adhesion strength through optimized application methods and material selection
Solution Approach 2:
The patent changes the material parameters by selecting adhesives with appropriate viscosity and glass transition temperature that enable strong adhesion at room temperature, eliminating the need for expensive high-performance adhesives that require complex processing conditions
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 effectively prevents electrode deviation, reduces production costs, and enhances battery performance by using adhesives that do not deteriorate the battery's functionality, while maintaining strong adhesion between electrodes and separators.
Implementation Method 1
an adhesive layer may be formed between the electrode and the separator
Implementation Method 2
the first adhesive part may be formed of a first adhesive which is dissolved in the electrolyte solution
Data Source
AI summary
An electrode assembly includes electrodes and separators alternately stacked. A first adhesive part is formed between at least one of the electrodes and at least one of the separators, and a second adhesive part is formed between adjacent separators. The second adhesive part is located outwardly relative to the first adhesive part.