Cylindrical Battery Tab Placement for Balanced Jelly-Roll Structure
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Solution Overview
Problem
Cylindrical secondary batteries face issues with distortion of the positive electrode tab and non-uniform internal expansion during charging and discharging, leading to potential disconnection and rapid degradation due to the imbalance in the internal structure.
Innovation Solution
The positions of the positive and negative electrode tabs are specified to be in the same quadrant of the jelly-roll type electrode assembly's horizontal cross-section, with the radial lines from the winding core to the tabs forming a specific angle to maintain uniformity and prevent overlap, ensuring a uniform diameter and minimizing thickness differences between quadrants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the positive electrode tab and negative electrode tab are positioned in different quadrants of the jelly-roll type electrode assembly, then the manufacturing process is simpler, but the internal structure becomes imbalanced causing distortion and non-uniform expansion during charging and discharging
Solution Approach 1:
The patent applies asymmetry by positioning both the positive electrode tab and negative electrode tab within the same quadrant of the horizontal cross-section, specifically in the first quadrant. This asymmetric arrangement relative to traditional opposite-quadrant positioning creates a balanced internal structure that prevents distortion and non-uniform expansion during charging and discharging cycles.
2Stability of the object's composition
If the electrode tabs are positioned to maintain uniform diameter and minimize thickness differences, then structural stability is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent applies local quality by specifying that both electrode tabs be positioned within the first quadrant of the horizontal cross-section. This localized positioning strategy ensures uniform diameter and minimizes thickness differences in specific regions, thereby improving overall structural stability while maintaining manageable manufacturing precision through defined spatial constraints.
Data Source
AI summary
A cylindrical secondary battery includes a jelly-roll type electrode assembly, a cylindrical case, and a positive electrode tab and a negative electrode tab coupled to the jelly-roll type electrode assembly. The cylindrical secondary battery includes a plurality of quadrants. The plurality of quadrants are defined by dividing a horizontal cross section perpendicular to a winding axis of the jelly-roll type electrode assembly into a plurality of sections. The positive electrode tab and the negative electrode tab are positioned in a first quadrant of the plurality of quadrants.