Wound Electrode Assembly Quadrant Tab Positioning
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Solution Overview
Problem
Existing secondary batteries face challenges in controlling the positions of electrode tabs within the wound electrode assembly, leading to potential electrical shorts and inefficiencies in tab spacing and insulation.
Innovation Solution
The secondary battery design incorporates a wound jelly roll electrode assembly where the first and second electrode tabs are strategically positioned in non-adjacent quadrants, with specific distance and thickness relationships defined by formulas to ensure proper spacing and insulation, and includes leads with widths less than the long axis length to prevent tab overlap and enhance electrical stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrode tabs are positioned in adjacent quadrants, then electrical connection is improved, but risk of electrical short increases
Solution Approach 1:
The electrode assembly is divided into four distinct quadrants, with positive and negative electrode tabs positioned in specific quadrants (first and third quadrants for positive, second and fourth quadrants for negative). This segmentation ensures that tabs of opposite polarity are spatially separated, preventing electrical shorts while maintaining reliable electrical connections to external terminals.
Solution Approach 2:
The patent employs asymmetric positioning of electrode tabs where positive tabs are located in non-adjacent quadrants (1 and 3) and negative tabs in different non-adjacent quadrants (2 and 4). This asymmetric arrangement creates inherent spatial separation between opposite polarity tabs, eliminating the risk of electrical short while preserving electrical connectivity.
2Quantity of substance
If tab spacing is reduced, then battery density is improved, but insulation effectiveness deteriorates
Solution Approach 1:
The patent transitions from one-dimensional linear spacing to two-dimensional quadrant-based spatial arrangement. By positioning tabs in different quadrants defined by orthogonal axes, the design achieves effective insulation through radial separation in multiple dimensions while maintaining compact overall structure, thus improving battery density without compromising insulation.
Solution Approach 2:
The patent applies different spatial arrangement rules to different quadrants: odd quadrants (1 and 3) contain positive electrode tabs while even quadrants (2 and 4) contain negative electrode tabs. This localized quality assignment ensures that insulation requirements are met in each local quadrant region while achieving high overall battery density through efficient space utilization.
3Reliability
If lead width is increased, then electrical conductivity is improved, but tab overlap risk increases
Solution Approach 1:
The patent pre-establishes the quadrant-based positioning system before connecting leads to tabs. By predeterminedly assigning positive leads to odd quadrants and negative leads to even quadrants, the design prevents tab overlap risk before it can occur, while still allowing sufficient lead width for good electrical conductivity.
Data Source
AI summary
A secondary battery including an electrode assembly. The electrode assembly includes a first electrode including a plurality of first electrode tabs extending to a side of the first electrode, a second electrode including a plurality of second electrode tabs extending to a side of the second electrode, and a separator between the first electrode and the second electrode and insulating the first electrode and the second electrode from one another. The electrode assembly is in a wound jelly roll shape. The plurality of first electrode tabs are in one of four quadrants formed by a long axis and a short axis of the wound electrode assembly. The plurality of second electrode tabs are in a different one of the four quadrants.