Electrode Assembly Tab Guide Piece for Electrolyte Infiltration
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Solution Overview
Problem
The infiltration of the electrolytic solution into the active material regions of the electrode assembly is hindered by the closed structure formed by the bend portion of the tab, leading to inadequate battery performance.
Innovation Solution
An electrode assembly design that includes a guide piece located in the bend portion of the tab, which increases the opening dimension and guides the electrolytic solution into the body portion, thereby enhancing infiltration and battery performance.
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 adjacent tab layers blocks the electrolytic solution path and hinders infiltration of the active material regions
Solution Approach 1:
The tab structure is segmented into multiple layers with alternating bend directions. The first tab layer bends in one direction while the second tab layer bends in the opposite direction, creating gaps between adjacent tab layers. This segmentation breaks the closed structure and allows electrolytic solution to penetrate into the body portion effectively.
Solution Approach 2:
The bend portions of the tab layers act as intermediaries that mediate between the space reduction requirement and the electrolytic solution infiltration requirement. By strategically bending the tabs, the structure creates channels that guide the electrolytic solution into the body portion while maintaining compact dimensions.
2Device complexity
If the tab layers are stacked closely to form a compact structure, then the device size is reduced, but the path for electrolytic solution entry is blocked
Solution Approach 1:
Different regions of the tab structure have different qualities: the body portion maintains a compact wound structure for high energy density, while the tab portions are locally modified with bends in alternating directions to create infiltration channels. This local quality differentiation allows the structure to be compact overall while providing specific pathways for electrolytic solution flow.
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.