Stack-Folding Electrode Assembly With Separator Edge Insulation
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Solution Overview
Problem
Lithium metal batteries face safety degradation due to lithium dendrite growth and dead lithium exposure during charging and discharging, leading to short circuits and reduced lifespan in stack-folding configurations.
Innovation Solution
Attaching insulation tape to the upper and lower sides of the folding separation film in a stack-folding type electrode assembly to prevent lithium dendrite exposure and suppress dead lithium protrusion, thereby maintaining battery integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a stack-folding scheme is used for lithium metal battery, then energy capacity is improved, but lithium dendrites and dead lithium are exposed on upper and lower sides causing short circuits
Solution Approach 1:
An insulation tape is introduced as an intermediary component between the folding separation film and the external environment. This insulation tape specifically covers the upper and lower sides where lithium dendrites and dead lithium are exposed, preventing direct contact between these harmful elements and the positive electrode, thus resolving the short circuit issue while preserving the stack-folding configuration's energy capacity benefits
2Reliability
If insulation tape is attached to upper and lower sides of folding separation film, then lithium dendrite exposure is prevented, but device complexity increases
Solution Approach 1:
The insulation measure is segmented by applying insulation tape only to the specific upper and lower sides of the folding separation film where lithium dendrites are exposed, rather than insulating the entire battery structure. This targeted approach prevents short circuits while minimizing the increase in device complexity and maintaining manufacturing efficiency
Data Source
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AI summary
The present invention relates to a stack-folding type of electrode assembly and a lithium metal battery including the same. In detail, according to an exemplary embodiment of the present invention, the lithium metal battery is realized as a stack-folding type, and the insulation tape is respectively attached to the upper side and the lower side of the folding separation film, thereby solving the drawback of exposure of the lithium dendrite and the dead lithium produced on the surface of the negative electrode during the charging and discharging process.