Jelly-Roll Electrode Tab Guide Structure for Electrolyte Infiltration
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Solution Overview
Problem
The infiltration of the electrolytic solution into the active material regions of a jelly-roll electrode assembly is hindered by the formation of a closed structure at the tab bend portion, which adversely affects battery performance.
Innovation Solution
Incorporating a guide piece in the bend portion of the tab to guide the electrolytic solution into the body portion, enhancing the infiltration effect by increasing the opening dimension and providing multiple paths for the electrolyte to enter the active material regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the tab is groomed to form a bend portion to reduce space occupied by the electrode assembly, then the space efficiency is improved, but the closed structure formed by abutting tab layers blocks the electrolytic solution path and worsens the infiltration effect
Solution Approach 1:
The tab structure is segmented into multiple layers with guide pieces inserted between adjacent tab layers. This segmentation breaks the closed structure formed by abutting tab layers, creating openings that allow electrolytic solution to penetrate into the body portion while maintaining the bent configuration for space efficiency.
Solution Approach 2:
Guide pieces are introduced as intermediary elements between adjacent tab layers. These guide pieces serve as mediators that prevent direct abutting of tab layers, thereby creating channels for electrolytic solution flow without compromising the compact bent tab structure.
2Device complexity
If the tab layers are stacked closely to form a compact structure, then the device complexity is reduced, but the path for electrolytic solution entry is blocked and infiltration is hindered
Solution Approach 1:
The tab layer stacking is transformed from a dense closed structure to a porous structure by inserting guide pieces between layers. This creates a controlled porosity that maintains structural compactness while providing pathways for electrolytic solution to infiltrate the body portion.
Data Source
AI summary
An electrode assembly and related battery, device, manufacturing method, and manufacturing device are provided. In some embodiments, the electrode assembly includes: a first electrode plate and a second electrode plate that are of opposite polarities, where an active material region of the first electrode plate and an active material region of the second electrode plate are wound to form a body portion, a non-active material region of the first electrode plate or a non-active material region of the second electrode plate is wound to form a tab, and the tab includes a bend portion bent against the body portion; and a guide piece. At least a part of the guide piece is located in the bend portion, and the guide piece is configured to guide an electrolytic solution into an interior of the body portion.