Cylindrical Battery Separator Layout for Expansion-Induced Short Prevention
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Solution Overview
Problem
Cylindrical secondary batteries face safety issues due to potential short circuits caused by the expansion of the negative electrode, leading to contact between the negative electrode mixture part and the positive electrode current collector plate.
Innovation Solution
The design includes a first electrode substrate tab that is bent and contacts the first electrode current collector plate, with a separator interposed to prevent direct contact between the negative electrode and the positive electrode, and a second separator with varying lengths to manage expansion, ensuring the separator contacts the current collector plate instead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the negative electrode plate expands during battery use, then the battery continues to operate, but the negative electrode mixture part may contact the positive electrode current collector plate causing a short circuit
Solution Approach 1:
The patent introduces a separator as an intermediary component between the negative electrode mixture part and the positive electrode current collector plate. This separator physically prevents direct contact between the expanding negative electrode and the positive electrode current collector plate, thereby eliminating the short circuit risk while allowing the battery to operate for extended periods.
Solution Approach 2:
The patent segments the battery internal structure by introducing a separator that divides the space between the negative electrode and positive electrode current collector plate. This segmentation creates distinct zones that prevent harmful interactions while maintaining functional operation, allowing the negative electrode to expand without causing shorts.
2Reliability
If the separator is extended to contact the positive electrode current collector plate, then short circuit prevention is improved, but the device structure becomes more complex
Solution Approach 1:
The patent merges the separator with the positive electrode current collector plate by having the separator extend and contact the plate. This integration ensures that the separator remains in position to prevent shorts while utilizing the existing structural components of the battery, thereby improving reliability without proportionally increasing overall device complexity.
Data Source
AI summary
A secondary battery includes: an electrode assembly having a first electrode plate having a first electrode substrate tab arranged in one direction, a second electrode plate having a second electrode substrate tab arranged in an opposite direction to the first electrode substrate tab, and a separator interposed between the first electrode plate and the second electrode plate, and wound into a cylindrical shape; a cylindrical can configured accommodating the electrode assembly; a first electrode current collector plate electrically connected to the first electrode substrate tab; and a second electrode current collector plate electrically connected to the second electrode substrate tab, wherein the first electrode substrate tab contacts the first electrode current collector plate, and the separator extends and contacts the first electrode current collector plate with the first electrode substrate tab interposed therebetween.