Jelly-Roll Battery Electrode Tabs for Stable Surface Welding
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Solution Overview
Problem
Secondary batteries face challenges in achieving uniform welding strength and preventing short circuits due to the lack of stable contact between electrode tabs and current collecting plates, especially when the electrode tabs are bent and pressed.
Innovation Solution
The solution involves forming notches on the non-coated parts of the electrode plates at specific angles and intervals, creating isosceles trapezoidal electrode tabs that are bent towards the winding axis, allowing for surface contact with current collecting plates and incorporating insulation layers to support the electrode tabs and prevent deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If electrode tabs are formed by bending non-coated parts of electrode plates, then welding strength and electrical contact are improved, but the electrode tabs deform and lose stability during bending and pressing operations
Solution Approach 1:
The non-coated part of the electrode plate is segmented into multiple electrode tabs through notches, creating discrete contact points that maintain structural integrity while enabling stable electrical connection with the current collecting plate
Solution Approach 2:
Notches are pre-formed in the non-coated part of the electrode plate before assembly, creating predetermined bending zones that guide the electrode tabs into their final positions and ensure stable contact with the current collecting plate during welding and operation
2Reliability
If electrode tabs are bent towards the winding axis to achieve surface contact with current collecting plates, then electrical contact and welding uniformity are improved, but short circuits may occur due to deformation and instability
Solution Approach 1:
Notches are pre-formed at specific angles and intervals to create predetermined bending paths for the electrode tabs, ensuring they bend towards the winding axis in a controlled manner that achieves surface contact with the current collecting plate while preventing uncontrolled deformation that could cause short circuits
Solution Approach 2:
The notches act as intermediary elements that mediate between the flat electrode plate and the bent electrode tab configuration, providing a transition zone that enables controlled bending towards the winding axis while maintaining electrical insulation and preventing short circuits
3Manufacturing precision
If notches are formed at specific angles and intervals to create isosceles trapezoidal electrode tabs, then uniform welding strength and resistance are achieved, but manufacturing complexity increases
Solution Approach 1:
Specific parameters for the notches (angle, interval, depth) are optimized to create isosceles trapezoidal electrode tabs that bend uniformly towards the winding axis, achieving consistent surface contact with the current collecting plate and uniform welding characteristics across all tabs
Solution Approach 2:
The non-coated part is segmented into multiple identical electrode tabs through regularly spaced notches, allowing standardized manufacturing processes to create uniform tabs that simplify welding operations and ensure consistent electrical connection across the electrode assembly
Data Source
AI summary
An embodiment of the present invention relates to a secondary battery, and with respect to a technical problem to be resolved, provided is a secondary battery which has an electrode tab provided by forming a notch on a non-coated part of an electrode plate of an electrode assembly, and which can enable a current collecting plate to come into surface contact with the electrode tab. To this end, disclosed is a secondary battery comprising: an electrode assembly which comprises a first electrode plate coated with a first electrode active material and having a first non-coated part formed along an upper end thereof, a second electrode plate coated with a second electrode active material and having a second non-coated part formed along a lower end thereof, and a separator interposed between the first electrode plate and the second electrode plate, and which is wound in a jelly roll shape; a can for accommodating the electrode assembly; a cap assembly for sealing the can; a first current collecting plate electrically connected to the cap assembly by coming into contact with the first non-coated part; and a second current collecting plate electrically connected to the can by coming into contact with the second non-coated part, wherein the first non-coated part and/or the second non-coated part has a structure in which a plurality of isosceles trapezoidal electrode tabs are arranged to be adjacent to one another with notches formed at a specific angle (α) and at predetermined intervals from a start point thereof that is closest to a winding axis, and thus the first non-coated part and/or the second non-coated part are bent toward the winding axis.