Secondary Battery Current Collector Structure for Compact High-Capacity Cells
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Solution Overview
Problem
Secondary batteries face challenges in minimizing electrical resistance and accommodating large electrode assemblies within a compact case, while maintaining efficient current paths and structural integrity.
Innovation Solution
The design includes first and second tabs aligned for low electrical resistance, three-dimensionally coupled current collector plates occupying a small volume, and a conductive ring plate on the case for improved flatness and structural support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If tabs are aligned in the same direction with three-dimensionally coupled current collector plates, then electrical resistance is reduced and current path is shortened, but device complexity increases
Solution Approach 1:
The current collector plates are configured in three-dimensional space with overlapping regions, transitioning from a two-dimensional planar arrangement to a three-dimensional spatial structure. This allows the first and second current collector plates to be coupled in the thickness direction, creating shorter current paths and reducing electrical resistance while managing the increased structural complexity through deliberate spatial arrangement.
2Quantity of substance
If three-dimensionally coupled current collector plates are used, then volume occupation is reduced and electrode assembly capacity is increased, but manufacturing complexity increases
Solution Approach 1:
The first and second current collector plates are nested within overlapping regions in the thickness direction of the electrode assembly. This nesting arrangement allows both plates to occupy the same spatial footprint without increasing the overall volume, maximizing the electrode assembly capacity while maintaining a compact structure that can be manufactured through layered assembly processes.
3Manufacturing precision
If conductive ring plate is added to the case, then flatness between terminals is improved, but device complexity increases
Solution Approach 1:
A conductive ring plate is introduced as an intermediary component between the first terminal protruding from the case and the second terminal formed on the case. This ring plate serves as a mediator to improve electrical contact and flatness between the terminals, addressing the precision requirement while adding a discrete component that can be separately manufactured and installed.
Data Source
AI summary
A secondary battery includes a case, an electrode assembly in the case, and including first tabs protruding in a first direction, and second tabs protruding in the first direction, a first current collector plate electrically connected to the first tabs, a second current collector plate electrically connecting the second tabs to the case, and a rivet terminal electrically connected to the first current collector plate and passing through the case.