Cylindrical Battery Gasket Structure for Crimping Pressure Support
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Solution Overview
Problem
The deformation of components such as the cap-up and safety vent during the assembly of the cap assembly in cylindrical secondary batteries due to pressure applied during the formation of the crimping and beading parts leads to reduced stability and reliability.
Innovation Solution
A gasket with a modified shape, featuring a protrusion that supports the current interrupt device, is used to distribute pressure more evenly, minimizing deformation of the cap-up and safety vent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional gasket without protrusion is used, then the assembly process is simpler, but the cap-up and safety vent deform due to pressure during crimping and beading
Solution Approach 1:
The gasket is designed with a localized protrusion at the specific position where the current interrupt device contacts it. This protrusion concentrates the supporting function at the critical contact point while keeping the rest of the gasket structure simple. The protrusion has a cross-sectional shape selected from triangular, streamlined, semicircular, semi-elliptical, or polygonal forms, with the highest point contacting a preset point of the current interrupt device to provide focused support.
Solution Approach 2:
The protrusion is pre-formed on the gasket before assembly, positioned to contact the current interrupt device at its lowest point. This preliminary structural preparation ensures that when pressure is applied during crimping and beading, the current interrupt device is already supported at the correct position, preventing deformation of the cap-up and safety vent before the deformation can occur.
2Strength
If pressure is applied during crimping and beading formation, then the cap assembly is securely fixed to the can, but the cap-up and safety vent become compressed and deformed
Solution Approach 1:
The protrusion acts as an intermediary support structure between the gasket and the current interrupt device. During the crimping and beading process, when pressure is applied to secure the cap assembly, the protrusion mediates the force transmission by supporting the current interrupt device at its lowest point. This prevents the pressure from directly compressing and deforming the cap-up and safety vent, while still allowing sufficient fixing strength to be achieved.
3Manufacturing precision
If the highest point of the protrusion contacts the current interrupt device, then support is provided to prevent deformation, but the gasket structure becomes more complex
Solution Approach 1:
The gasket structure is enhanced locally with a protrusion at the specific contact point with the current interrupt device, rather than making the entire gasket more complex. The protrusion's cross-section can be triangular, streamlined, semicircular, semi-elliptical, or polygonal, providing precise geometric support at the critical location while keeping the overall gasket design relatively simple.
Solution Approach 2:
The protrusion introduces an asymmetric feature to the otherwise symmetric ring-shaped gasket body. This asymmetric protrusion is strategically positioned to contact the current interrupt device at its lowest point, providing precise positioning and support. The asymmetry is localized and functional, enabling accurate component alignment without requiring complete redesign of the symmetric gasket structure.
Data Source
AI summary
One embodiment of the present disclosure relates to a secondary battery including a cylindrical can including a circular bottom part, and a side part extending from the bottom part, the side part having an open end portion, an electrode assembly accommodated in the cylindrical can, a current interrupt device disposed in the open end portion of the side part and having a vent therein, and a gasket disposed between the side part and the current interrupt device and including a protrusion configured to support a lower part of the current interrupt device.According to the embodiment of the present disclosure, by improving the shape of the gasket, components such as a cap-up and a safety vent are not deformed by pressure when a crimping part and a beading part are formed on the can for assembly of the cap assembly. Thus, the stability of the secondary battery can be improved.