Chamfered Electrode Sheet Corners to Prevent Separator Piercing
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Solution Overview
Problem
Lithium batteries assembled by the sheet-stacking method still face the risk of electrode sheets piercing separators due to acute, obtuse, or right angles at the edge corners, which can cause movement and contact when impacted by external forces.
Innovation Solution
The electrode sheets feature chamfered edges with arc segments and transition segments that protrude away from the center, reducing the risk of piercing by smoothing the transitions between edges and preventing movement-induced contact with separators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If edge corners of electrode sheets are made into V-shaped angles to prevent movement, then the risk of electrode sheets piercing separators is reduced to a certain extent, but right angles of the electrode sheets have not been completely eliminated and only been reduced or shifted in position
Solution Approach 1:
The patent applies curvature by replacing the V-shaped angle structure with a rounded arc segment structure at the edge corners of electrode sheets. The arc segment has a radius of curvature R where 0.5mm < R ≤ 50mm, creating a smooth curved transition instead of sharp angles. This curved structure effectively eliminates right angles and prevents electrode sheets from piercing separators while maintaining structural simplicity.
2Reliability
If arc segments with large radius of curvature are used to eliminate right angles, then the effectiveness in preventing piercing is improved, but the processing difficulty and manufacturing cost increase
Solution Approach 1:
The patent specifies a precise parameter range for the radius of curvature R (0.5mm < R ≤ 50mm) to optimize the balance between piercing prevention effectiveness and manufacturing ease. This parameter control ensures that the arc segments are sufficiently curved to eliminate right angles and prevent piercing, while remaining within feasible processing capabilities and cost constraints.
Data Source
AI summary
An electrode sheet, a battery cell, and a battery are provided. The electrode sheet includes an electrode sheet body. The electrode sheet body includes a first side edge and a second side edge connected. A connection position between the first side edge and the second side edge is provided with a first chamfer. The first chamfer includes a first arc segment and at least one first transition segment. The first arc segment is connected to the first side edge and/or the second side edge through the at least one first transition segment. The first arc segment protrudes toward a direction away from a center of the electrode sheet body.