Electrode Assembly Insulation Layout Against Lithium Dendrite Shorts
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Solution Overview
Problem
In secondary batteries, repeated charging and discharging lead to the deposition of positive ions on the electrode assembly, which can result in short-circuits due to lithium dendrite formation and penetration through the separator.
Innovation Solution
The electrode assembly includes a first and second electrode plate with uncoated portions and base tabs, a separator, tab cover tapes, uncoated portion cover tapes, and insulating tapes to minimize positive ion deposition and prevent short-circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If charge and discharge are repeated, then the battery capacity is improved, but positive ions are deposited on the electrode assembly and may puncture the separator causing short-circuits
Solution Approach 1:
The insulating tape is attached to the positive electrode plate in advance, before any ion deposition or dendrite formation occurs. This preliminary protective measure prevents positive ions from depositing on the uncoated portion and forming dendrites that could puncture the separator, thereby maintaining reliability throughout repeated charge-discharge cycles
Solution Approach 2:
The insulating tape acts as an intermediary barrier between the positive electrode plate and the separator. It prevents direct contact and ion deposition between these components, serving as a protective mediator that eliminates the harmful interaction while allowing the battery to function normally over extended periods
2Reliability
If lithium dendrites grow and puncture the separator, then the battery may experience short-circuits, but the insulating tape prevents this by blocking dendrite formation
Solution Approach 1:
The insulating tape is applied specifically to the uncoated portion of the positive electrode plate where base tabs are formed, rather than covering the entire electrode. This localized approach provides targeted protection against dendrite formation at the vulnerable uncoated areas while maintaining the overall simplicity of the electrode assembly structure
Solution Approach 2:
The insulating tape is a simple, inexpensive component that provides effective protection without adding significant complexity to the battery design. It is a straightforward additive element that can be easily incorporated into the manufacturing process without requiring complex structural modifications
Data Source
AI summary
An electrode assembly includes: a first electrode plate having a first electrode uncoated portion spaced apart from both ends in a longitudinal direction thereof, and a base tab on one surface of the first electrode uncoated portion; a second electrode plate having a second electrode uncoated portion spaced apart from both ends in a longitudinal direction thereof, and a base tab on one surface of the second electrode uncoated portion; a separator between the first electrode plate and the second electrode plate; a tab cover tape attached to the one surfaces of the first electrode uncoated portion and the second electrode uncoated portion; an uncoated portion cover tape attached to each of the other surfaces of the first electrode uncoated portion and the second electrode uncoated portion; and an insulating tape attached onto the second electrode plate at a position corresponding to the first electrode uncoated portion.