Laminated Battery Seal Fold Geometry for Impact Resistance
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Solution Overview
Problem
Laminated batteries face challenges in impact resistance, as the fused portions of the laminate film can be damaged by external impacts, leading to reduced battery performance.
Innovation Solution
The laminated battery design incorporates a fused portion with three or more bend portions, including two or more fold portions bent at 90° or less and one distal end-side bend portion bent at less than 180°, with the distal end facing the electrode body, enhancing impact resistance by distributing impact forces effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the fused portion is formed by superposing and fusing end portions of the laminate film, then the electrode body is sealed, but the fused portion has poor impact resistance and can be damaged by external impacts
Solution Approach 1:
The patent applies curvature to the fused portion by forming it in an arcuate shape rather than a straight line. This curved configuration allows the fused portion to better distribute and absorb impact forces, preventing damage while maintaining sealing performance. The arcuate shape acts as a structural buffer that reduces stress concentration during impacts.
Solution Approach 2:
The fused portion is divided into multiple segments including a first folded bend portion, a second folded bend portion, and a distal end-side bend portion. This segmentation creates multiple bend regions that can independently absorb and distribute impact energy, preventing a single point of failure while maintaining the sealing function.
2Volume of moving object
If the fused portion is folded to reduce the size of the outer shape, then structural efficiency is improved, but impact resistance may be compromised
Solution Approach 1:
The patent employs arcuate bending in the fused portion to achieve both size reduction and enhanced impact resistance. The curved shape compactly folds the laminate film ends while simultaneously creating a shock-absorbing structure that distributes impact forces across multiple bend points, preventing structural failure.
Solution Approach 2:
The patent creates different local structures within the fused portion, including specific bend angles and arcuate shapes at different locations. The first and second folded bend portions have different characteristics from the distal end-side bend portion, allowing each region to optimize for both compactness and impact resistance in its specific location.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design significantly improves the impact resistance of the fused portion, preventing deformation and subsequent damage to the electrode body, thereby maintaining battery performance under external impacts.
Implementation Method 1
part of the laminate film is fused to form a fused portion in order to seal the electrode body
Data Source
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AI summary
A laminated battery includes an electrode body and a laminate film that covers and seals the electrode body inside. The laminate film has a fused portion formed by superposing end portions of the laminate film and fusing together their inner surfaces. The fused portion has three or more bend portions including two or more fold portions that are bent in angular or arcuate shapes so as to have an angle of 90° or less and one distal end-side bend portion that is bent in an angular or arcuate shape so as to have an angle less than 180° in a position closest to a distal end of the fused portion . The fused portion has a shape in which at least part of the distal end faces the electrode body side.