Secondary Battery Electrode Tab Structure With Overlapping Notched Layers
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Solution Overview
Problem
Existing secondary batteries face issues with reduced battery capacity and mechanical strength due to the formation of non-coating portions required for attaching multiple electrode tabs, which also increase electrical resistance.
Innovation Solution
A secondary battery design featuring a notching tab part extending from the coating portion of the electrode collector, forming multiple overlapping layers, which are bent and bonded to the can member, minimizing non-coating areas and enhancing mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple electrode tabs are attached to the electrode assembly, then electrical resistance is reduced and current distribution is improved, but non-coating portions must be formed which lower battery capacity
Solution Approach 1:
The patent transitions from traditional end-tab configuration to side-tab configuration, changing the spatial dimension of tab attachment. This allows tabs to be positioned at the side of the wound electrode assembly rather than at the ends, reducing the required non-coating portion area while maintaining multiple tab connections for improved current distribution and reduced electrical resistance.
Solution Approach 2:
The patent applies different coating qualities to different regions of the electrode collector. The tab regions have non-coating portions for electrical connection, while the majority of the electrode surface maintains active material coating for capacity. This localized differentiation optimizes both electrical performance and battery capacity by minimizing the area sacrificed for tab attachments.
2Strength
If electrode tabs are notched and extended from the coating portion, then mechanical strength is improved, but the complexity of the electrode structure increases
Solution Approach 1:
The electrode tab is segmented into distinct functional regions: a notched portion extending from the coating area that provides mechanical strength, and a bonded portion that connects to the electrode assembly. This segmentation allows the tab to fulfill multiple functions - structural reinforcement through notching and electrical connection through bonding - while maintaining a relatively simple overall electrode structure.
Solution Approach 2:
The electrode tab structure combines different material properties and configurations - the notched portion provides mechanical reinforcement while the bonded portion ensures electrical connectivity. This composite approach integrates structural and electrical functions into a unified tab design that enhances mechanical strength without significantly increasing manufacturing complexity.
Data Source
AI summary
The present invention relates to a secondary battery in which an electrode tab is improved in mechanical strength and a method for manufacturing the same. Also, the secondary battery according to the present invention includes: an electrode provided with a coating portion coated with an active material on an electrode collector and a non-coating portion on which the active material is not applied to the electrode collector in a longitudinal direction of the electrode collector and a notching tab part extending from the coating portion in a width direction of the electrode collector without coating with the active material and overlapping each other to form two or more layers when the electrode is wound.