Rotatable Battery Connecting Piece for Smooth Tab Folding
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Solution Overview
Problem
Lithium batteries with tabs leading out of the side surface face space waste issues due to tab length, and the bending process of current collectors is not smooth, leading to tab tears and poor product consistency.
Innovation Solution
A battery connecting piece with a rotatable second current collector connected to a first current collector, allowing for precise adjustment and smooth rotation to fold tabs, preventing tears and improving bending precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the current collector is bent to drive tabs to fold parallel to the side surface, then space waste is reduced, but the bending process causes tab tears and poor product consistency
Solution Approach 1:
The current collector is designed with a rotating section that can rotate relative to the straight section, transforming the static bending process into a dynamic rotation process. This allows the tab to be folded smoothly by rotation rather than forced bending, reducing tab tears and improving manufacturing precision while achieving the same space-saving effect
Solution Approach 2:
The current collector is divided into multiple sections: a straight section, a rotating section with rotating core, and a bent section. This segmentation allows independent optimization of each part - the straight section provides structural support, the rotating section enables smooth rotation, and the bent section achieves the parallel orientation - thereby improving overall manufacturing precision while reducing space occupation
2Volume of moving object
If the current collector is bent to fold tabs, then space occupation is reduced, but the process complexity increases due to sudden stroke changes
Solution Approach 1:
By introducing a rotating section with a rotating core, the abrupt bending process is transformed into a controlled rotation process. The rotating section acts as a hinge that guides the tab through a smooth arc motion, eliminating sudden stroke changes and reducing process complexity despite adding a rotational degree of freedom
3Volume of moving object
If the current collector is bent to fold tabs, then space occupation is reduced, but product consistency deteriorates due to difficult angle control
Solution Approach 1:
The rotating section with rotating core provides a defined rotation axis and controlled movement, allowing precise control over the tab folding angle. The rotation mechanism ensures consistent angular displacement, improving product consistency while achieving the space-saving parallel orientation of tabs
Data Source
AI summary
Disclosed are a battery connecting piece, a top cover assembly and a lithium battery. The battery connecting piece includes a first current collector and a second current collector, the first current collector is connected to the second current collector in a rotatable manner, the first current collector is configured to be connected to a top cover of a battery, the second current collector is configured to weld a tab of a cell, and an extension direction of a central axis of the second current collector rotating relative to the first current collector is perpendicular to a plane where the top cover is located in a state that the first current collector is connected to the top cover. The battery connecting piece drives the tab to fold more smoothly to prevent the tab from being torn, a bending precision of the tab is improved, and a product consistency is improved.