Laminated Battery Exterior Body Corner Design for Stress Distribution
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Solution Overview
Problem
The convex structure in laminated battery exterior bodies is prone to thinning at the corners due to stress during pressing, which can lead to tearing.
Innovation Solution
Incorporating a corner design with a first primary curved portion, a straight portion, and a second secondary curved portion in the exterior body's convex structure, which disperses stress and maintains thickness, along with a method of flanging using a mold shaped to match this design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the convex structure is formed by flanging (pressing) a laminate sheet, then the power generation element can be enclosed, but the corner is easily thinned by stress and tearing may occur
Solution Approach 1:
The corner of the convex structure incorporates a curved portion instead of a sharp angle, which distributes stress more evenly during the flanging process. This curvature prevents stress concentration at the corner, thereby suppressing thinning and tearing while maintaining the enclosing function of the convex structure.
2Reliability
If the corner is designed with only curved portions, then stress distribution is improved, but the thickness at the corner may still be insufficient
Solution Approach 1:
The corner is divided into multiple segments: a first curved portion, a straight portion, and a second curved portion. This segmentation allows each portion to serve a specific function - the curved portions distribute stress while the straight portion maintains adequate thickness, collectively preventing thinning and tearing.
Solution Approach 2:
Different portions of the corner are designed with different geometries to optimize local performance. The curved portions are positioned where stress distribution is critical, while the straight portion is positioned where thickness maintenance is critical, creating a corner structure with optimized local qualities throughout.
Data Source
AI summary
A main object of the present disclosure is to provide an exterior body wherein the thickness at corner of the convex structure is suppressed from being thinned. The present disclosure achieves the object by providing an exterior body for a laminated battery, and the exterior body comprises a convex structure with a space for enclosing a power generation element, the convex structure includes a top surface, in plan view, the top surface includes a first side, a second side extending in a direction crossing the first side, and a corner C12 connecting the first side and the second side, and in plan view, the corner C12 includes a curved portion 1A, a straight portion L12, and a curved portion 2B, from the first side toward the second side.