Cylindrical Battery Collector Plate Wing Structure for Welding Alignment
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Solution Overview
Problem
Welding defects occur in cylindrical secondary batteries due to dispersion of the electrode assembly height, beading part height, and poor positioning of the negative electrode current collector plate's wings, leading to unreliable connections.
Innovation Solution
A cylindrical secondary battery design featuring a second current collector plate with a body part and a ring-shaped wing part, where the wing part includes coupling parts and slots to improve alignment and stability during welding, reducing defects by absorbing height dispersion and ensuring secure coupling to the case and electrode assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a negative electrode current collector plate with multiple integrated wings is used and connected to the beading part through laser welding, then electrical connection is achieved, but welding defects occur due to height dispersion and poor positioning
Solution Approach 1:
The current collector plate is divided into a body part and a separate wing part. The wing part is detachably coupled to the body part, allowing independent positioning and welding optimization. This segmentation enables the body part to be precisely positioned on the electrode assembly while the wing part is specifically designed for reliable welding to the beading part, thereby resolving the contradiction between welding reliability and positioning precision.
2Adaptability or versatility
If the wing parts are positioned to accommodate height variations, then adaptability is improved, but welding quality deteriorates due to dispersion of total height and beading part height
Solution Approach 1:
The body part serves as an intermediary between the electrode assembly and the wing part. It absorbs and compensates for height variations in the electrode assembly through its positioning structure, while providing a stable, precisely positionable base for the wing part to be welded to the beading part. This intermediary function resolves the contradiction by decoupling the adaptability requirement from the welding precision requirement.
Data Source
AI summary
Provided is a battery. The battery includes an electrode assembly including a first electrode plate, a separator, and a second electrode plate, a first current collector plate contacting a bottom surface of the electrode assembly, and electrically connected to the first electrode plate, a second current collector plate contacting a top surface of the electrode assembly, and electrically connected to the second electrode plate, a case for accommodating the electrode assembly, the first current collector plate, and the second current collector plate, and electrically connected to the second current collector plate, and a cap plate for sealing an upper portion of the case, wherein the second current collector plate includes a body part coupled to the second electrode plate, and a wing part fixed to the body part and the case.