Wound Electrode Assembly Openings for Electrolyte Penetration
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Solution Overview
Problem
The presence of metal pieces at the axial end of a wound electrode assembly in energy storage cells can hinder the penetration of electrolyte solution into the separator, leading to potential delamination and reduced cell performance.
Innovation Solution
Incorporating metal pieces with openings, such as through holes and cuts, or radial portions of reduced length to facilitate electrolyte solution flow, allowing it to reach the separator while minimizing delamination risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If metal pieces are provided at the axial end of the wound electrode assembly to provide conductive portions, then electrical conductivity is improved, but the penetration of electrolyte solution into the separator is hindered
Solution Approach 1:
The metal pieces are designed with through-holes penetrating them in the radial direction, creating a porous structure that allows electrolyte solution to pass through while maintaining electrical conductivity. This resolves the contradiction by enabling both electrical function and electrolyte penetration simultaneously.
Solution Approach 2:
The metal pieces are divided into multiple segments arranged in the radial direction, with gaps between them that allow electrolyte solution to flow through. This segmentation maintains the conductive function while creating pathways for electrolyte penetration, resolving the technical contradiction.
2Strength
If metal pieces cover the axial end of the cell to provide conductive portions, then electrical connectivity is improved, but the flow of electrolyte solution is hindered
Solution Approach 1:
The metal pieces incorporate through-holes that create a porous structure, allowing electrolyte solution to flow through the conductive portions. This maintains electrical connectivity while enabling electrolyte flow, resolving the contradiction between electrical performance and fluid flow.
Solution Approach 2:
The through-holes in the metal pieces act as intermediaries that allow electrolyte solution to pass through the conductive metal structure. This mediator approach enables both electrical connectivity and electrolyte flow to coexist.
Data Source
AI summary
An energy storage cell includes a wound electrode assembly including a positive electrode plate (first electrode), a negative electrode plate (second electrode), and a separator. The positive electrode plate includes a plurality of portions (metal pieces) provided at end portions in the Z direction (axial direction). A through hole (opening) is formed in each of the plurality of portions.