Mesh Electrode Assembly Fixing for Flat, Contamination-Resistant Cells
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Solution Overview
Problem
Conventional electrode assemblies face issues such as lithium precipitation in pressure-sensitive adhesive portions, defects due to tape steps, and foreign substance inflow, which affect the performance and reliability of medium-to-large battery modules.
Innovation Solution
The proposed electrode assembly features a mesh-type electrode fixing part with through-holes covering the entire upper surface and side surfaces of the electrode stack, preventing lithium precipitation and foreign substance ingress while allowing uniform electrolyte injection and reduced thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional taping method with overlapping tapes is used to fix electrode assembly, then electrode layers are secured, but steps are generated causing lithium precipitation defects
Solution Approach 1:
The electrode fixing part is divided into multiple through-holes that segment the tape structure, allowing the tape to conform to the electrode surface without creating steps. The through-holes enable the tape to wrap around the electrode edges smoothly, eliminating the overlapping steps that cause lithium precipitation.
Solution Approach 2:
The electrode fixing part uses a mesh-type structure with through-holes that allows electrolyte penetration while maintaining mechanical fixation. This porous structure eliminates the need for overlapping tapes, providing a flat surface that prevents lithium precipitation defects.
2Volume of moving object
If separator is removed to reduce thickness, then electrode assembly becomes thinner, but foreign substances can infiltrate
Solution Approach 1:
The electrode fixing part serves multiple functions simultaneously: it provides mechanical fixation, blocks foreign substance infiltration, and allows electrolyte penetration through its through-holes. This multi-functional design replaces the separator's protective function while enabling thickness reduction.
Solution Approach 2:
The mesh-type electrode fixing part acts as a flexible barrier that prevents foreign substance infiltration while allowing the electrode assembly to be thinner. The thin film structure with controlled porosity provides protection without adding excessive thickness.
3Productivity
If mesh-type fixing part with through-holes is used, then electrolyte injection is improved, but structural complexity increases
Solution Approach 1:
The mesh-type structure with through-holes creates a porous material that naturally facilitates electrolyte injection throughout the electrode assembly. The uniform distribution of holes provides multiple injection pathways, improving electrolyte penetration efficiency without requiring complex injection systems.
Solution Approach 2:
The fixing part is segmented into multiple through-holes distributed across its surface, creating a simple yet effective pattern that enhances electrolyte injection. This segmented approach avoids the need for complex injection mechanisms while maintaining structural integrity.
Data Source
AI summary
The present invention relates to an electrode assembly and a method of manufacturing an electrode assembly, wherein the electrode assembly according to one example of the present invention comprises an electrode stack part, in which a basic unit cell obtained by sequentially laminating a separator, a first electrode, a separator, and a second electrode is laminated numerously in two or more layers, and an electrode fixing part, by which the electrode stack part is surrounded and fixed, having a plurality of through-holes.