Separator Core Depression for Wet Stacking Stability
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Solution Overview
Problem
The separator core of a separator roll can cause damage and winding defects due to foreign objects or damage, leading to issues like sticking and falling during storage and reuse, especially when cores are stacked wet after cleaning.
Innovation Solution
A separator core with a depression on its side surface is designed to prevent cores from sticking together and falling, by reducing the contact area and enhancing separation strength, even when stacked wet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If separator cores are stacked wet after cleaning for reuse, then storage efficiency is improved, but cores stick together and lower cores fall when upper cores are removed
Solution Approach 1:
The invention introduces a depression (curved/recessed feature) on the side surface of the separator core. This curvature modification creates an air gap or reduced contact area between stacked cores, preventing adhesion when wet. The depression transforms the flat side surface into a non-planar geometry that eliminates full surface contact, thereby preventing sticking while maintaining stable stacking.
2Productivity
If a core has foreign objects adhered or is significantly damaged, then winding process continues, but winding defects occur including transference of foreign objects and wrinkling
Solution Approach 1:
The depression on the core surface serves as a preliminary detection feature. Before winding begins, the presence of foreign objects or damage can be detected by examining whether the depression maintains its intended geometry. This preliminary check prevents defective cores from entering the winding process, avoiding transference of foreign objects and wrinkling while maintaining production continuity by identifying issues before they affect the separator.
3Stability of the object's composition
If cores are stacked with full side surface contact for stable storage, then storage stability is improved, but cores stick together when wet
Solution Approach 1:
The depression creates a controlled reduction in contact area between stacked cores. By introducing this geometric feature, the core maintains sufficient contact for stability while eliminating the full surface adhesion that occurs with wet stacking. The curved/recessed geometry allows cores to stack stably without complete side-to-side contact, preventing capillary action and adhesion forces.
Solution Approach 2:
The depression effectively removes a portion of the side surface contact area. By extracting material or creating a recess in the core geometry, the invention reduces the interface between stacked cores, thereby eliminating the harmful adhesion effect while preserving enough contact area for stable stacking.
Data Source
AI summary
A core (u1, u2) around which a nonaqueous electrolyte secondary battery separator is to be wound. A side surface of the core (u1, u2) has a depression (20). This makes it possible, in a case where cores (separator cores) are stored by being stacked while still wet after cleaning, to prevent damage to a core caused by a problem where cores stick together and an core lower in a stack falls when a core higher in the stack is removed.