Cylindrical Battery Current Collector Plates for Vibration-Stable Welding
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Solution Overview
Problem
Secondary batteries experience separation phenomena at welding regions between the electrode assembly and current collector plates, as well as between the current collector plates and the can or cap assembly, due to vibration or impact.
Innovation Solution
The secondary battery design includes first and second current collector plates with cantilever beams and slits, allowing independent movement of welding regions to prevent separation, and an insulating layer to prevent electrical connection between the second current collector plate and the cylindrical can.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the current collector plate is rigidly connected to both the electrode assembly and the can, then electrical connection is ensured, but separation phenomena occur at welding regions under vibration or impact
Solution Approach 1:
The current collector plate is designed with a flexible portion that can dynamically deform under external force. This flexibility allows the plate to absorb vibration and impact forces through elastic deformation, preventing stress concentration at the welding regions while maintaining electrical connection. The flexible portion acts as a shock-absorbing element that adapts to mechanical stresses without causing separation at critical joints.
Solution Approach 2:
The current collector plate is divided into distinct functional segments: a rigid base portion for stable electrical connection, a flexible intermediate portion for shock absorption, and connection points for welding. This segmentation allows each portion to perform its specific function optimally - the rigid parts maintain connection stability while the flexible part accommodates mechanical stress, thereby preventing separation phenomena.
Data Source
AI summary
A secondary battery including a cylindrical can, an electrode assembly in the cylindrical can and including a plurality of first substrate tabs extending from one side of the electrode assembly along a longitudinal direction of the cylindrical can, and a plurality of second substrate tabs extending from an opposite side of the electrode assembly along the longitudinal direction of the cylindrical can; a cap assembly for sealing the cylindrical can; a first current collector plate electrically connecting the plurality of first substrate tabs to the cylindrical can; and a second current collector plate insulated from the cylindrical can and electrically connecting the plurality of second substrate tabs to the cap assembly.