Wound Battery Electrode Assembly With Core-Safe Adhesive Patterning
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for manufacturing batteries with wound electrode assemblies and adhesive layers lack efficiency in productivity due to inadequate control over adhesive layer placement and weight distribution, leading to issues with continuous production and yield.
Innovation Solution
A method involving a specific winding process where strip-shaped separators and electrode sheets are wound around a core with strategically formed adhesive layers, with regions having varying adhesive weights or no adhesive at the winding initiation ends to minimize adhesion to the core, ensuring high productivity and preventing production inhibition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive layers are formed on separators to bond electrode sheets, then bonding strength is improved, but adhesion to the winding core increases causing production interruptions
Solution Approach 1:
The adhesive layer is designed with non-uniform distribution: it is formed in regions that do not contact the winding core during the first winding step, while regions that would contact the core have no adhesive or reduced adhesive content. This local differentiation ensures strong bonding where needed while preventing unwanted adhesion to the core that would interrupt production.
2Stability of the object's composition
If adhesive layers are formed uniformly across separators, then consistent bonding is achieved, but adhesion to the winding core increases causing production interruptions
Solution Approach 1:
Instead of uniform adhesive distribution, the invention implements spatially varying adhesive patterns where the presence, absence, or quantity of adhesive is specifically controlled based on the local winding geometry. This ensures consistent bonding performance in electrode-to-separator interfaces while preventing consistent adhesion to the winding core surface.
3Strength
If adhesive layers are formed with high basis weight, then bonding strength is improved, but adhesion to the winding core increases causing production interruptions
Solution Approach 1:
The adhesive basis weight is controlled to be high in regions where bonding is required (between separators and electrode sheets) and low or zero in regions that contact the winding core. This local optimization achieves strong bonding strength where needed while minimizing total adhesive quantity and preventing core adhesion.
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 approach enables the production of batteries with wound electrode assemblies and adhesive layers, enhancing productivity by reducing adhesive layer adhesion to the winding core, thus preventing production interruptions and maintaining high yield.
Implementation Method 1
the positive electrode sheet being bonded with the first separator via a first adhesive layer
Data Source
AI summary
Provided is a technology which can produce a battery comprising a wound electrode assembly including separators having adhesive layers, with high productivity. In one suitable aspect of the method of manufacturing a battery as disclosed herein, the method comprises a first winding step of bringing a first separator and a second separator into contact with a winding core and winding the first separator and the second separator around the winding core; a second adhesive layer forming step of forming a second adhesive layer in the second separator; a first adhesive layer forming step of forming a first adhesive layer in the first separator; a second winding step of winding a positive electrode sheet and an negative electrode sheet around the winding core along with the first separator and the second separator; and a pressing step of pressing, after the second winding step, the first separator, the positive electrode sheet, the second separator, and the negative electrode sheet which have been wound.