Cylindrical Battery Insulation Plate Aperture Design
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Solution Overview
Problem
Cylindrical secondary batteries face issues with electric shorts between electrode tabs and plates or the can due to differences in polarity, which can lead to instability and safety concerns.
Innovation Solution
The design incorporates a specially configured insulation plate with linear and circular small apertures to prevent electrical contact between the positive and negative electrode tabs and the can, ensuring a tight fit and safe electrolyte injection and gas discharge, while the insulation plates are strategically positioned to prevent abnormal bending of the electrode tabs from causing shorts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional insulation plate with standard aperture configuration is used, then the structure is simple and easy to manufacture, but electric shorts may occur between electrode tabs and electrode plates or can due to improper insulation
Solution Approach 1:
The insulation plate is segmented into multiple functional regions: a first region with a first aperture for the first electrode tab, a second region with a second aperture for the second electrode tab, and a third region with a third aperture for electrolyte injection. This segmentation allows each aperture to be optimally positioned and sized for its specific function, preventing electric shorts while maintaining manufacturing feasibility.
Solution Approach 2:
Different regions of the insulation plate are designed with locally optimized properties: the first aperture has a first size configured for tight fit of the first electrode tab, the second aperture has a second size for the second electrode tab, and the third aperture is specifically positioned in the third region for electrolyte injection. This local quality approach ensures proper insulation in each critical area without requiring complex overall structure.
2Reliability
If the apertures are dispersed across the entire insulation plate area, then each electrode tab can be accommodated, but the insulation effectiveness is reduced and electric shorts may occur
Solution Approach 1:
The aperture arrangement transitions from a two-dimensional dispersed layout to a strategically organized three-dimensional configuration where the first, second, and third apertures are positioned in specific regions of the insulation plate. This spatial organization ensures that apertures are distributed in a way that maintains insulation effectiveness while providing adequate access for electrode tab connections and electrolyte injection.
Data Source
AI summary
A cylindrical secondary battery including a battery unit including a wound first electrode plate, separator, and second electrode plate, and first and second electrode tabs respectively protruding from the first and second electrode plates; a can for accommodating the battery unit; a cap assembly for sealing an opening of the can; and a first insulation plate in the can and on an upper portion of the battery unit, the first insulation plate being configured to prevent a short between the first electrode tab and the second electrode plate having different polarities, wherein the first insulation plate includes a linear small aperture through which the first electrode tab extends and a circular small aperture for injection of an electrolyte, and the linear and circular small apertures are disposed in a region equal to or less than 50% of the first insulation plate.