Cylindrical Battery Cell Assembly With Opening-Aligned Uncoated Parts
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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 where the first and second uncoated parts of the electrode assembly are disposed in the direction of an open side of a cylindrical case, with collector plates spaced apart and connected to form a simplified manufacturing process, reducing resistance and maximizing capacity.
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 separate uncoated parts instead of using single strip-shaped tabs. This segmentation distributes the current flow across multiple contact points, reducing current concentration and heat generation at any single point while improving overall current collection efficiency.
2Reliability
If tab-less battery cell design is used, then current collection efficiency is improved, but manufacturing process becomes complicated with high welding difficulty
Solution Approach 1:
Instead of welding collector plates to uncoated parts as in conventional tab-less designs, the patent inverts the connection approach by having uncoated parts extend outward and connect to collector plates through mechanical means or simplified bonding. This reversal of the connection sequence simplifies the manufacturing process while maintaining efficient current collection.
3Reliability
If collector plates are welded to upper end and lower end of electrode assembly, then current collection is improved, but welding defects occur increasing cell resistance
Solution Approach 1:
The patent introduces an intermediary structure where uncoated parts extend outward from the electrode assembly to serve as connection points. This intermediary approach eliminates direct welding between collector plates and the electrode assembly, reducing welding defects and associated resistance issues while maintaining effective current collection.
4Reliability
If uncoated parts are disposed at upper end and lower end, then current collection efficiency is improved, but manufacturing complexity increases due to hole formation in case
Solution Approach 1:
The patent merges the functions of multiple uncoated parts by having them extend outward in a unified manner from the electrode assembly. This consolidation allows for simplified case design where openings can be minimized or eliminated, reducing overall device complexity while maintaining improved current collection efficiency.
Data Source
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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.