Slit Current Collector Plate for Vibration-Resistant Battery Welding
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Solution Overview
Problem
Secondary batteries face issues with separation of welding regions between the electrode assembly and current collector plate or between the current collector plate and the can due to vibrations or impacts.
Innovation Solution
The secondary battery design includes a current collector plate with slits, such as C-shaped or U-shaped, to maintain a connected state between the electrode welding portion and the body, and a first terminal electrically coupled through a case hole, enhancing stability during vibrations or impacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the current collector plate is made as a solid rigid structure, then the electrical connection is good, but the welding region separates under vibration or impact
Solution Approach 1:
The current collector plate is divided into multiple segments by introducing slits, creating a multi-lobe structure. This segmentation allows each lobe to independently absorb vibration and impact energy, preventing the entire welding region from separating while maintaining electrical conductivity through the segmented structure.
Solution Approach 2:
The structural parameters of the current collector plate are changed by introducing slits with specific geometries (C-shaped, U-shaped, or radial patterns). These parameter changes transform the rigid structure into a flexible segmented structure that can dynamically respond to vibrations and impacts, maintaining welding region stability under dynamic conditions.
2Reliability
If slits are introduced in the current collector plate, then vibration resistance is improved, but the structural complexity increases
Solution Approach 1:
The slits segment the current collector plate into multiple lobes, creating a structure that inherently resists vibration and impact. The segmentation is achieved through simple geometric modifications (radial or circumferential slits) rather than complex additional components, balancing vibration resistance with structural simplicity.
Solution Approach 2:
The slits are strategically positioned in specific regions of the current collector plate (radially from center or circumferentially around the periphery) to provide vibration resistance where most needed, while maintaining structural integrity and electrical conductivity in critical areas. This localized approach optimizes vibration resistance without unnecessarily complicating the overall structure.
Data Source
AI summary
A secondary battery includes: an electrode assembly, a case accommodating the electrode assembly, a cap plate sealing the case; and a current collector plate welded between the electrode assembly and the case or between the electrode assembly and the cap plate. The current collector plate has a slit therein.