Wound Electrode Assembly Core Support Against Jelly Roll Collapse
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Solution Overview
Problem
The core collapse phenomenon in jelly roll-type electrode assemblies of cylindrical batteries, caused by repeated expansion and contraction of electrodes during charging and discharging, leads to increased risk of short circuits and safety issues.
Innovation Solution
An electrode assembly with a support portion on the inner wall of the central winding hole, formed by a UV curing agent coating on the separators, enhances the rigidity of the core structure to prevent deformation and minimize short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a jelly roll-type electrode assembly is wound without additional support structures, then the manufacturing process is simple, but the core structure deforms due to electrode expansion and contraction during charging and discharging
Solution Approach 1:
A support portion is formed on the inner wall of the central winding hole before the electrode assembly is fully wound and sealed. This preliminary structural reinforcement prevents core collapse that would otherwise occur during subsequent charging and discharging cycles, resolving the contradiction between manufacturing simplicity and core structure stability.
Solution Approach 2:
The support portion is located specifically at the inner wall of the central winding hole where core collapse occurs, rather than uniformly throughout the entire electrode assembly. This localized reinforcement maintains manufacturing simplicity while effectively preventing core structure deformation during battery operation.
2Stability of the object's composition
If the inner wall of the central winding hole is reinforced with a support portion, then core structure stability is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The support portion is formed as a thin coating layer on the inner wall of the central winding hole rather than as a bulky structural element. This thin-film approach provides necessary structural reinforcement while minimizing impact on the overall simplicity of the electrode assembly structure and manufacturing process.
3Reliability
If a support portion is added to prevent core collapse, then safety is improved, but the device complexity increases
Solution Approach 1:
The support portion is integrated with the existing electrode assembly structure by forming it on the inner wall of the central winding hole during the winding process itself. This merging approach provides safety improvements through core collapse prevention without requiring separate additional components or complex assembly steps.
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 support portion effectively suppresses core deformation and reduces the risk of short circuits, improving safety and process efficiency while maintaining electrolyte infiltration.
Implementation Method 1
The support portion may include a coating layer formed on at least one of the first separator and the second separator. The coating layer may include a UV curing agent.
Data Source
AI summary
An electrode assembly having a wound stacked structure, a first separator, a second electrode, and a second separator are sequentially stacked is provided. The electrode assembly includes a support portion provided on the inner wall of a central winding hole formed in a core of the electrode assembly by winding the stack so as to provide rigidity to the inner wall.