Perforated Current Collector Structure for Faster Electrolyte Impregnation
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Solution Overview
Problem
Current current collectors without perforations at the peripheral portion hinder the rapid impregnation of electrolytic solution in battery electrodes, leading to slow solution penetration and potential air accumulation, which affects battery performance and safety.
Innovation Solution
A current collector design featuring partial opening formation portions with protrusions at the tips, allowing the electrolytic solution to penetrate from the peripheral and end surfaces, while maintaining strength and preventing stress from active material expansion and contraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If holes are formed in the current collector to improve peel resistance, then peel resistance is improved, but strength of the current collector is reduced
Solution Approach 1:
The patent applies local quality by creating protrusion portions only at specific locations (tips of holes) rather than uniformly across the entire current collector. This localized modification provides enhanced peel resistance at the interface with active material while preserving the overall strength of the current collector structure.
Solution Approach 2:
The patent uses partial action by forming holes with protrusion portions only in specific regions where peel resistance is needed, rather than creating a uniform pattern throughout. The protrusion portions are formed at the tips of holes to provide just enough mechanical interlocking without excessive material removal that would compromise overall strength.
2Reliability
If holes are formed at the peripheral portion of the current collector, then peel resistance is improved, but stress resistance at the peripheral portion is reduced
Solution Approach 1:
The patent applies local quality by differentiating the treatment between peripheral and central regions. The peripheral portion maintains a flat surface without holes, preserving stress resistance, while the central portion receives hole formation with protrusion portions for improved peel resistance. This spatial differentiation of structural properties resolves the contradiction between peel resistance and stress resistance.
3Ease of manufacture
If the current collector has a flat surface, then manufacturing is simple, but the active material layer is prone to peeling
Solution Approach 1:
The patent uses partial action by maintaining a flat surface for most of the current collector area, preserving manufacturing simplicity. Only specific locations (tips of holes in the central portion) are modified with protrusion portions to provide the necessary mechanical interlocking for peel resistance. This minimal modification approach balances manufacturing ease with improved reliability.
Solution Approach 2:
The patent creates a porous structure with holes containing protrusion portions that extend into the active material layer. This porous configuration provides mechanical interlocking that prevents peeling while maintaining a predominantly flat surface that is simple to manufacture. The protrusion portions act as anchors within the porous structure.
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 design facilitates rapid and complete impregnation of the electrolytic solution, reducing air accumulation and enhancing battery performance and safety by allowing the solution to reach all gaps between layers, while resisting stress from active material expansion and contraction.
Implementation Method 1
the active material layer reaches an inside of the hole, i.e., an area other than the flat surface, and for this reason, peel resistance is improved
Implementation Method 2
it becomes difficult for an electrolytic solution to enter the center portion from the peripheral portion
Data Source
AI summary
The purpose of the present invention is to provide a current collector that has high strength and is easily impregnated with an electrolyte. This current collector is provided with an opening formation portion provided with a plurality of openings, the current collector being characterized in that a protruding portion is formed at the tip of each opening, and only partial locations of the opening formation portion reach an end surface of the current collector and the other locations thereof do not reach the end surface.