Arc-Bent Current Collector Structure to Prevent Battery Tab Piercing
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Solution Overview
Problem
The formation of sharp corners during the bending of current collecting members in secondary batteries can lead to piercing of tabs, reducing current flow capacity and affecting battery performance.
Innovation Solution
The design of a current collecting member with an arc-shaped bending portion and a connecting portion that extends from the bending portion, allowing the first tab to be bent along the arc-shaped surface, thereby avoiding sharp corners and reducing stress concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the current collecting member and tabs are bent to reduce space occupied, then the space efficiency is improved, but sharp corners are likely to form that can pierce the tabs, reducing current flow capacity
Solution Approach 1:
The patent applies curvature by designing the bending portion of the current collecting member with an arc shape instead of sharp corners. The bending portion includes a first surface and a second surface that form a curved transition, ensuring that when tabs are bent along these surfaces, no sharp corners are formed that could pierce the tabs. This curved geometry maintains both space efficiency and tab integrity.
2Reliability
If the tabs are bent along the surface of the bending portion, then stress concentration is reduced and tab splitting is avoided, but the manufacturing complexity increases
Solution Approach 1:
The bending portion is designed with curved surfaces (first and second surfaces) that distribute stress evenly during the bending process. When tabs are bent along these curved surfaces, stress concentration is avoided, preventing tab splitting. The curved geometry is formed through standard metal forming processes, making it manufacturable without excessive complexity.
Solution Approach 2:
The patent changes the geometric parameters of the bending portion by specifying arc-shaped surfaces with controlled radii. The first radius and second radius of curvature are designed to optimize stress distribution during bending. By carefully selecting these geometric parameters, the design achieves both improved reliability (avoiding tab splitting) and reasonable manufacturability through standard forming processes.
Data Source
AI summary
This application provides a current collecting member and a secondary battery. The current collecting member includes a substrate and a support plate, the substrate is disposed on a side of a body of the electrode assembly in the transverse direction and extends in a direction perpendicular to the transverse direction, the support plate extends from an outer end of the substrate in the longitudinal direction and folds back to a side of the substrate farther from the body. The support plate includes a bending portion and a connecting portion, the bending portion is connected to the substrate and bent into an arc shape, and the connecting portion extends from an end of the bending portion farther from the substrate; and a first tab of the electrode assembly is connected to the connecting portion and bent along a surface of the bending portion.