Cylindrical Electrode Assembly Layout for Low-Resistance Current Collection
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Solution Overview
Problem
Conventional cylindrical battery cells face issues of high resistance, high heat generation, and poor current collection efficiency due to current concentration on strip-shaped electrode tabs, and tab-less designs complicate manufacturing with potential welding defects.
Innovation Solution
A battery cell design with first and second uncoated parts disposed in specific regions of the electrode assembly, allowing simplified manufacturing and reduced resistance by eliminating complex welding processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If strip-shaped electrode tabs are used to connect uncoated parts, then current collection is achieved, but current concentration occurs resulting in high resistance and high heat generation
Solution Approach 1:
The uncoated parts are divided into multiple segments (first uncoated part and second uncoated part) positioned at different radial locations. This segmentation distributes the current collection points, preventing current concentration and reducing both resistance and heat generation while maintaining effective current collection.
2Reliability
If tab-less design with collector plates is used, then current collection efficiency is improved, but manufacturing complexity increases and welding defects occur
Solution Approach 1:
The invention extracts and eliminates the collector plates and welding processes from the battery structure. By directly utilizing the uncoated parts of the electrodes as current collection points, the complex welding operations are removed, simplifying manufacturing while maintaining effective current collection.
Solution Approach 2:
The uncoated parts of the electrodes serve dual functions: they are both the active electrode components and the current collection points. This self-service approach eliminates the need for separate collector plates and welding operations, reducing manufacturing complexity while maintaining current collection efficiency.
3Reliability
If collector plates are welded to upper and lower ends, then current collection is achieved, but manufacturing difficulty increases and resistance may increase due to welding defects
Solution Approach 1:
The invention removes the collector plates and welding operations from the manufacturing process. By positioning uncoated parts at different radial locations, current collection is achieved directly through the electrode structure itself, eliminating the need for difficult welding operations at the upper and lower ends.
Solution Approach 2:
Instead of adding collector plates to the ends of the electrode assembly (conventional approach), the invention inverts the approach by utilizing uncoated parts at different radial positions along the electrode wound structure. This inversion simplifies manufacturing by eliminating welding while maintaining current collection functionality.
Data Source
AI summary
An embodiment of the present disclosure may provide a battery cell including an electrode assembly in which a first electrode including a first uncoated part, a second electrode including a second uncoated part, and a separator disposed between the first electrode and the second electrode are wound in a roll shape, and a cylindrical case including an opening with one side open, and configured to accommodate the electrode assembly inside through the opening, where the first uncoated part and the second uncoated part are disposed in a direction of the opening.