Cylindrical Battery Electrode Apertures for Electrolyte Infiltration
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Solution Overview
Problem
Jelly-roll battery cells face challenges in electrolyte infiltration due to insufficient electrolyte penetration between concentric layers, leading to decreased battery performance in terms of capacity and cycle life, especially when conductive strips are rubbed together.
Innovation Solution
Incorporating passageways at the rubbing region of electrode sheets, both radially and longitudinally, to facilitate efficient electrolyte infiltration within the rolled battery cell configuration, allowing the electrolyte to flow through apertures formed in the anode or cathode, thereby maximizing electrolyte distribution across the concentric layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conductive strips are rubbed together to form connection points, then electrical connection is improved, but electrolyte infiltration is blocked
Solution Approach 1:
The conductive strip is segmented by forming apertures through it, creating multiple passageways that allow electrolyte to infiltrate through the rubbing region while maintaining the electrical connection function of the strip
Solution Approach 2:
The conductive strip is transformed into a porous structure with apertures that enable electrolyte penetration while preserving the continuous conductive path for electrical current flow
2Ease of manufacture
If electrolyte is introduced via top opening, then infiltration process is simple, but infiltration efficiency is insufficient
Solution Approach 1:
Electrolyte infiltration is enabled in multiple dimensions by creating radial passageways through the conductive strip, allowing electrolyte to reach concentric layers from the outer radius toward the center, supplementing the top-down infiltration path
3Speed
If high pressure is applied to force electrolyte infiltration, then infiltration speed increases, but battery performance decreases
Solution Approach 1:
The mechanical pressure-driven infiltration system is supplemented by a structurally-enabled infiltration system where apertures in the conductive strip provide natural pathways for electrolyte to penetrate without requiring excessive pressure, reducing mechanical stress on the battery 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 solution enhances electrolyte infiltration, improving battery performance by ensuring better ion transport between the anode and cathode, leading to increased capacity and extended cycle life of the battery cells.
Implementation Method 1
At least one of the anode and the cathode includes a plurality of apertures formed from an inner radial surface of the roll to an outer radial surface of the roll. The plurality of apertures form passageways that are configured to facilitate a flow of the electrolyte within the roll.
Data Source
AI summary
A cylindrical battery cell. The cylindrical battery cell includes an anode, a cathode, one or more separator sheets that separates the anode from the cathode, an electrolyte and a cylindrical housing. The anode, the one or more separator sheets, and the cathode are rolled together to form a roll and the anode, the cathode and the one or more separators form concentric layers within the roll. The roll is seated in the cylindrical housing. At least one of the anode and the cathode includes a plurality of apertures formed from an inner radial surface of the roll to an outer radial surface of the roll. The plurality of apertures form passageways that are configured to facilitate a flow of the electrolyte within the roll such that the electrolyte flows into the roll.