Battery Electrode Tab Convex Arc Coupling for Impact Resistance
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Solution Overview
Problem
Secondary batteries lack effective impact resistance for their electrode tabs, which can lead to peeling off or breakage under external stress, compromising their durability and performance.
Innovation Solution
The battery design incorporates a first electrode tab with a convex arc-shaped coupling portion and a lead-out piece, along with a fixing and anti-rotation piece, to distribute stress evenly and prevent concentration, enhancing impact resistance through a cross-shaped arrangement and specific curvature designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a straight coupling portion is used to connect the electrode tab to the cell surface, then the structure is simple and easy to manufacture, but the electrode tab is prone to stress concentration and peeling off under external impact
Solution Approach 1:
The coupling portion is designed with a convex arc shape instead of a straight line, creating a curved structure that naturally distributes stress. The convex arc geometry allows stress to be dispersed along the curved surface rather than concentrating at sharp corners or straight joints, significantly improving impact resistance and preventing peeling off of the electrode tab.
2Strength
If the coupling portion is made wider to distribute stress, then impact resistance improves, but the space occupied on the cell surface increases
Solution Approach 1:
The coupling portion extends in multiple directions from the lead-out piece, forming a cross-shaped configuration. This multi-directional extension allows the coupling area to be distributed across different spatial dimensions on the cell surface, effectively increasing the stress distribution area without requiring a simple linear increase in width in one direction, thus optimizing space utilization.
3Reliability
If additional fixing pieces are added to prevent rotation and improve stability, then reliability improves, but manufacturing complexity increases
Solution Approach 1:
The fixing pieces are integrated as integral parts of the electrode tab structure, formed simultaneously with the lead-out piece and coupling portion in a single manufacturing process. This merging of components eliminates the need for separate assembly steps to attach fixing pieces, thereby improving reliability through enhanced stability and rotation prevention while maintaining ease of manufacture.
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
The improved design effectively mitigates stress concentration and peeling-off risks, enhancing the impact resistance and durability of the electrode tabs, thereby improving the battery's overall performance and reliability.
Implementation Method 1
The first coupling portion has a convex arc shape toward the first lead-out piece. The arc shape may be formed along a third axis crossing the first and second axes.
Implementation Method 2
The first coupling portion may include (or may be) a welding line formed by laser welding or may include a welding line having an arc shape.
Data Source
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AI summary
A battery includes: a cell having a first surface and a second surface opposite to each other along a first axis; and a first electrode tab on the first surface of the cell. The first electrode tab includes: a first coupling piece including a first coupling portion coupled to the first surface of the cell; and a first lead-out piece extending from the first coupling piece outside a periphery of the cell along a second axis. The first coupling portion has a convex arc shape toward the first lead-out piece.