Nonaqueous Battery Electrode Tab Layout to Prevent Deformation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing non-aqueous electrolyte secondary batteries face challenges in increasing capacity while preventing electrode deformation due to the formation of exposed portions and protective tape coverage, which can concentrate stress and lead to deformation during charge and discharge cycles.
Innovation Solution
The battery design features exposed portions along the longitudinal direction of the electrode, with tabs connected only at one end and covered by non-overlapping protective members, reducing the exposed area and inhibiting deformation by distributing stress evenly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the exposed portion is formed over the entire length in the width direction to connect tabs, then the tab connection is secure, but the electrode area is reduced and capacity is limited
Solution Approach 1:
The patent applies local quality by forming exposed portions only at specific locations (both ends in the longitudinal direction) rather than over the entire length. This localized approach provides sufficient tab connection security at critical points while preserving the majority of the electrode area for active material, thereby increasing battery capacity.
2Reliability
If protective tapes are overlapped to cover exposed portions and tabs, then safety is improved, but stress concentrates and electrode deformation occurs
Solution Approach 1:
The patent applies segmentation by dividing the protective tape coverage into separate, non-overlapping sections. Each exposed portion and its adjacent mixture layer are covered by distinct protective tape segments without overlap. This segmentation distributes stress evenly across the electrode structure, preventing the stress concentration that would lead to deformation while maintaining safety coverage.
3Quantity of substance
If the exposed portion area is reduced to increase capacity, then battery capacity increases, but tab connection and safety coverage become insufficient
Solution Approach 1:
The patent maintains reliability by concentrating protective coverage and tab connections at critical locations (both ends in the longitudinal direction) rather than distributing them uniformly. This localized quality approach ensures adequate tab connection security and safety coverage at essential points while minimizing the exposed portion area elsewhere, thereby maximizing battery capacity.
Data Source
AI summary
This nonaqueous electrolyte secondary battery has a first electrode, that comprises a collector and a mixture layer that is formed on at least a part of the surface of the collector; the surface of the first electrode is provided with a plurality of exposure parts, in which the collector is exposed, in the longitudinal direction; the plurality of exposure parts are in contact with only one of both edges of the first electrode in the width direction; a plurality of tabs are respectively connected to the exposure parts and are led out from one edge; a plurality of protection members respectively cover the exposure parts, the tabs, and portions of the mixture layer exposed in the exposure parts in the width direction; and the plurality of covered portions, in which the mixture layer is covered by the protection members, do not overlap with each other in the width direction.