Slit Tab Structure for Flat-End Cylindrical Battery Electrodes
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Solution Overview
Problem
The existing process of kneading tabs in cylindrical battery production often results in metal filings, causing active material loss and deformation, which compromises the safety and energy density of lithium-ion batteries.
Innovation Solution
A cylindrical battery electrode plate design featuring tabs with slits that form an included angle with the tab arrangement direction, allowing the tabs to be spread and smoothed, thereby avoiding metal filings and improving alignment and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the tabs are kneaded to flatten the cylindrical end faces, then the end faces are flattened, but metal filings are generated causing active material loss and electrode plate deformation
Solution Approach 1:
The tabs are divided into multiple sub-tabs by extending slits from the end of each tab. This segmentation allows the tabs to be spread and flattened without requiring intensive kneading, thereby preventing metal filings generation and active material loss while achieving the desired flatness of the cylindrical end faces.
2Shape
If the tabs are kneaded to flatten the cylindrical end faces, then the end faces are flattened, but the electrode plates deform and safety is reduced
Solution Approach 1:
By dividing each tab into multiple sub-tabs through extended slits, the structure enables controlled spreading and flattening during winding. This eliminates the need for aggressive kneading that causes deformation and safety issues, while still achieving the required flatness of the cylindrical end faces.
3Loss of substance
If the tabs are spread and smoothed from one side, then metal filings are avoided, but the alignment of inner and outer ring tabs must be precise
Solution Approach 1:
The slits are extended to specific positions on the tabs, creating localized divisions that control the spreading behavior. This local modification ensures that the tabs spread and smooth from one side without metal filings, while the slit positioning maintains precise alignment between inner and outer ring tabs during winding.
Data Source
AI summary
The disclosure relates to the technical field of battery production and manufacture, in particular to a cylindrical battery electrode plate including a electrode plate body and a plurality of tabs provided on one side of the electrode plate body, wherein a gap area is provided between adjacent tabs of the plurality of tabs, each of the plurality of tabs is respectively provided with one or more slits extending along a surface thereof, a starting end of each of the slits is provided at one end, away from the electrode plate body, the extending direction of each of the slits is arranged to form an included angle with the arrangement direction of the plurality of tabs, and each of the plurality of tabs is divided into a plurality of sub-tabs by the slits.