Cylindrical Battery Cap Plate Notch for Controlled Vent Rupture
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Solution Overview
Problem
Existing cylindrical secondary batteries face challenges in precisely controlling the notch rupture pressure and uncrimping pressure, leading to potential uncrimping before notch rupture, which can compromise safety and increase material costs.
Innovation Solution
A cylindrical secondary battery design with a cap plate having a notch with a lower rupture pressure than the uncrimping pressure of the crimping portion, utilizing a gasket made of insulating material and specific dimensions and materials for the cap plate and crimping portion to ensure precise control over these pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the crimping portion is designed with high uncrimping pressure to prevent premature opening, then the structural integrity is improved, but the manufacturing precision and control over rupture pressure become more difficult
Solution Approach 1:
The invention divides the pressure resistance function into two separate components: the crimping portion provides structural strength and sealing, while the notch provides controlled rupture at a lower pressure threshold. This segmentation allows each component to be optimized independently - the crimping portion can be designed for high uncrimping pressure without compromising the ability to precisely control notch rupture pressure, thereby resolving the technical contradiction between strength and manufacturing precision.
2Strength
If the cap plate thickness is increased to prevent uncrimping, then the strength is improved, but the material costs and device complexity increase
Solution Approach 1:
The invention segments the cap plate into regions of different thickness - a thicker crimping portion for structural strength and sealing, and a thinner notch region for controlled rupture. This segmentation allows the cap plate to achieve high uncrimping resistance through the thick crimping portion while maintaining simplicity and reducing overall material usage by having a thinner notch section. The segmented design resolves the contradiction between strength and device complexity by optimizing material distribution according to functional requirements.
Data Source
AI summary
Disclosed is a cylindrical secondary battery including an electrode assembly, a cylindrical can having a circular upper surface portion and a side portion extending from the upper surface portion, the side portion having a beading portion formed adjacent to an end thereof so as to be inwardly recessed and a crimping portion formed by bending an end of the side portion, the can receiving the electrode assembly, and a cap plate coupled to an open end of the can, the cap plate having a notch formed therein, wherein the rupture pressure of the notch is lower than the uncrimping pressure of the crimping portion. The cylindrical secondary battery may be efficiently designed by designing and controlling factors that affect the rupture pressure and uncrimping, and safety of the cylindrical secondary battery can be improved by performing control such that uncrimping does not occur before rupture of the notch.