Electrode Stack Outer Tape with Through-Holes for Wetting and Rigidity
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Solution Overview
Problem
Existing electrode assemblies face issues with separator folding, weak insertability into tight battery cases, and bending when handled, due to inadequate fixation and weak fixing forces, which affect wetting characteristics and overall battery performance.
Innovation Solution
An electrode assembly design featuring an outer tape with through-holes surrounding the electrode stack to prevent separator folding, enhance insertability, and reduce bending, while ensuring excellent wetting characteristics through controlled tape tension and electrolyte permeation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a tape is used to fix the electrode stack, then the electrode assembly can be held together, but the separator folds backward due to buoyancy when electrolyte is injected
Solution Approach 1:
The outer tape is divided into multiple segments along the longitudinal direction, with through-holes formed at regular intervals. This segmentation allows the tape to maintain fixing force while permitting electrolyte penetration, preventing separator folding caused by buoyancy forces during electrolyte injection.
Solution Approach 2:
The outer tape is designed with through-holes that create a porous structure, enabling electrolyte to pass through the tape and reach the separator. This prevents the separator from folding backward due to buoyancy while maintaining the structural integrity of the electrode stack.
2Device complexity
If only band-shaped tapes are used for fixing, then the structure is simple, but the fixing force is relatively weak and bending occurs when lifted
Solution Approach 1:
The outer tape extends not only along the longitudinal direction but also in the width direction, covering the entire peripheral surface of the electrode stack. This two-dimensional extension significantly enhances the fixing force and prevents bending when the electrode assembly is lifted, while maintaining relative structural simplicity.
3Strength
If the outer tape is continuous without through-holes, then the fixing force is strong, but the wetting characteristics are poor
Solution Approach 1:
The outer tape is segmented with through-holes at regular intervals, creating a balance between maintaining fixing force and enabling electrolyte penetration. The segmented structure provides sufficient mechanical strength while allowing proper wetting of the electrode components.
Solution Approach 2:
The outer tape has different properties in different regions: the areas between through-holes provide strong fixing force, while the through-hole regions allow electrolyte penetration for proper wetting. This local differentiation resolves the contradiction between strength and wetting characteristics.
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 separator folding and bending, improves insertability, and achieves superior wetting characteristics, leading to enhanced battery performance and stability.
Implementation Method 1
a through-hole is formed in a first region of the outer tape which is present at a position corresponding to the side surface of the electrode stack
Implementation Method 2
excellent wetting characteristics
Data Source
AI summary
An electrode assembly includes an electrode stack formed by alternately stacking an electrode and a separator, and an outer tape attached to an outer surface of the electrode stack. The outer tape is attached to the electrode stack to surround a side surface thereof, and a through-hole is formed in a first region of the outer tape which is present at a position corresponding to the side surface of the electrode stack.