Separator Expansion Structure for Stable Electrode Assembly
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing electrode assembly fixing method using tape in secondary batteries leads to increased internal resistance and electrode degradation due to thickness differences and folding issues, particularly with the negative electrode.
Innovation Solution
The electrode assembly incorporates an expansion part on the separator that surrounds the laminated monocells, eliminating the need for tape by bonding the monocells using heat and pressure, and optionally using extension parts on the collectors for additional fixation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If tape is used to fix the laminated monocells, then the monocells are held together, but the ends of the tape protrude causing thickness difference and the negative electrode edge folds
Solution Approach 1:
The harmful tape component is completely removed from the system. Instead of using tape to fix monocells, the invention extracts this external fixing element and replaces it with an integrated expansion part formed on the separator itself, eliminating the source of thickness difference and folding problems
Solution Approach 2:
The fixing function previously performed by the separate tape is merged into the separator structure itself through the expansion part. The separator now performs both its primary function of isolating electrodes and the secondary function of fixing monocells, eliminating the need for external tape and its associated problems
2Stability of the object's composition
If tape is used to fix the laminated monocells, then the monocells are held together, but the negative electrode edge folds and internal resistance increases
Solution Approach 1:
The harmful tape component is completely removed from the system. Instead of using tape to fix monocells, the invention extracts this external fixing element and replaces it with an integrated expansion part formed on the separator itself, eliminating the source of thickness difference and folding problems
Solution Approach 2:
The separator performs self-service by providing its own expansion part that serves the fixing function. Rather than relying on external tape, the separator structure itself generates the fixing mechanism through its expansion part, ensuring reliable fixation without compromising electrode integrity
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 configuration stabilizes the electrode assembly, reduces internal resistance, and prevents electrode degradation by ensuring a smooth surface and improved bonding, while also providing enhanced cooling and structural support.
Implementation Method 1
bonding the monocells using heat and pressure
Data Source
AI summary
The present invention provides an electrode assembly in which a negative electrode coated with a negative electrode active material on a surface of a negative electrode collector, a separator, and a positive electrode coated with a positive electrode active material on a surface of a positive electrode collector are repeatedly laminated, the electrode assembly comprising: monocells in which the positive electrode, the separator, the negative electrode, and the separator are laminated, wherein at least two or more monocells are laminated, wherein, in any one of the monocells, an expansion part extending lengthily to one side is formed on the separators, and the expansion part of the separator surrounds the monocells laminated to be disposed at the outermost layers to fix the laminated monocells.