Wound Battery Electrode Lamination With Localized Adhesive Layers
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Solution Overview
Problem
Current methods for manufacturing batteries with wound electrode assemblies and adhesive layers face challenges in productivity due to limitations in forming adhesive layers at precise positions and preventing adhesion to rollers and winding cores, leading to inhibited production and yield.
Innovation Solution
A method involving the formation of first and second adhesive layers on specific surfaces of separators and electrode sheets, followed by lamination, allowing for controlled placement and reduced adhesion to manufacturing equipment, enhancing productivity and preventing adhesive layer damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If adhesive layers are formed on separators and electrode sheets using conventional methods, then battery assembly can be manufactured, but productivity is reduced due to adhesion issues with rollers and winding cores
Solution Approach 1:
The adhesive layers are formed on the separators and electrode sheets before the lamination and winding processes. This preliminary formation allows the adhesive to be positioned exactly where needed, preventing unwanted adhesion to rollers and winding cores during subsequent manufacturing steps, thereby maintaining both productivity and adhesive layer integrity
Solution Approach 2:
Adhesive layers are applied only at specific locations on the separators and electrode sheets where bonding is required, rather than uniformly across entire surfaces. This localized application prevents adhesion to manufacturing equipment while ensuring proper bonding at critical interfaces, resolving the contradiction between productivity and reliability
2Productivity
If adhesive layers are formed at precise positions, then productivity is improved, but adhesion to rollers and winding cores must be prevented
Solution Approach 1:
The adhesive layers are applied only at specific predetermined positions on the separators and electrode sheets where bonding is required. By controlling the location and extent of adhesive application, the method achieves precise positioning for productivity while preventing harmful adhesion to rollers and winding cores through localized quality control
3Productivity
If conventional lamination methods are used, then battery assembly is formed, but adhesive layer damage occurs reducing yield
Solution Approach 1:
The adhesive layers are formed in advance on the separators and electrode sheets before lamination. This preliminary action ensures that adhesives are already positioned at precise locations, and the subsequent lamination process simply brings components together without requiring high-precision alignment during bonding, thus maintaining both manufacturing speed and positioning accuracy
Solution Approach 2:
The manufacturing process is divided into distinct steps: adhesive layer formation, lamination, and winding. By segmenting the process, the adhesive formation can be optimized for precision while lamination and winding can be optimized for speed, resolving the contradiction between productivity and manufacturing precision
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 enables the production of batteries with wound electrode assemblies and adhesive layers at high productivity, minimizing adhesion issues and maintaining adhesive layer integrity, thus improving the efficiency and yield of the battery manufacturing process.
Implementation Method 1
the positive electrode sheet being bonded with the first separator via a first adhesive layer, and the positive electrode sheet adhering to the second separator via a second adhesive layer
Data Source
AI summary
Provided is a technology which can produce a battery comprising a wound electrode assembly including adhesive layers, with high productivity. The method of manufacturing a battery as disclosed herein comprises a first formation step of forming a first adhesive layer on a surface of a first separator; a second formation step of forming a second adhesive layer on a surface of a positive electrode sheet; and a lamination step of laminating the first separator, the positive electrode sheet, a second separator, and an negative electrode sheet.