Cylindrical Battery Sub-Plate Welding Area Expansion
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Solution Overview
Problem
In cylindrical secondary batteries, when both the negative and positive electrodes are positioned at one side, the narrow area for welding the negative electrode terminal poses a challenge due to the insulation configuration, limiting welding convenience and efficiency.
Innovation Solution
The design includes a sub-plate with a ring-shaped base and extending portions that cover the crimping part and gasket, providing additional area for welding the negative electrode terminal and ensuring electrical connection to the can, while maintaining insulation between the cap and can components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If both the negative electrode and positive electrode are positioned at one side of the battery, then the battery structure is simplified and electrode arrangement is optimized, but the welding area for the negative electrode terminal becomes narrow
Solution Approach 1:
The sub-plate extends in the radial direction (another dimension) from the cap plate, creating an extended welding surface that increases the welding area without increasing the axial height of the battery. This dimensional extension allows the negative electrode terminal to be welded on the side surface of the sub-plate, effectively solving the narrow welding area problem while maintaining the one-sided electrode configuration.
2Reliability
If the cap plate is electrically connected to the positive electrode plate and insulated from the can, then proper electrical isolation is achieved, but additional insulation components are required
Solution Approach 1:
The sub-plate integrates multiple functions: it serves as an electrical connection path from the cap plate to the can, provides an extended welding surface for the negative electrode terminal, and its outer surface acts as an insulation barrier. By merging these functions into a single component, the need for separate insulation parts is reduced, simplifying the overall structure while maintaining reliable electrical isolation.
Data Source
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AI summary
A cylindrical secondary battery includes: an electrode assembly including a first electrode plate and a second electrode plate; a can having a bottom portion and a cylindrical side portion, accommodating the electrode assembly, and electrically connected to the first electrode plate; and a cap assembly. The cap assembly includes: a cap plate coupled to one end of the side portion of the can and electrically connected to the second electrode plate; a gasket insulating the cap plate and the side portion from each other; and a sub-plate covering at least a portion of the cap plate and at least a top portion of the side portion.