Cylindrical Battery Cap-Up Structure for Stable Gas Discharge
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Solution Overview
Problem
Cylindrical secondary batteries face issues with inefficient gas discharge when internal pressure increases, as the cap assembly's structural rigidity is low, leading to deformation that blocks the gas discharge path, and high rigidity prevents quick gas release.
Innovation Solution
The cap assembly design includes a cap-up with a terminal portion, a base portion, and bridge parts with varying widths and grooves, ensuring a balanced compressive strength that allows for efficient gas discharge while maintaining structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the cap-up has low structural rigidity, then the cap-up can deform to release gas through the piercing hole, but the cap-up may be deformed by external force blocking the piercing hole and preventing smooth gas discharge
Solution Approach 1:
The cap-up is divided into multiple bridge parts connecting the terminal portion to the base portion. These bridge parts include a first bridge part and a second bridge part with different structural configurations, creating segmented pathways for gas discharge while maintaining overall structural integrity.
Solution Approach 2:
Different regions of the cap-up have different structural properties. The first bridge part has a first thickness and the second bridge part has a second thickness different from the first, creating local variations in rigidity and flexibility that enable controlled deformation for gas release while preventing complete structural failure.
2Reliability
If the cap-up has high structural rigidity, then the cap-up can maintain structural integrity and prevent deformation, but the cap-up blocks the piercing hole and prevents smooth gas discharge
Solution Approach 1:
The cap-up structure is segmented into multiple bridge parts with different thicknesses, allowing the structure to maintain overall integrity while creating localized flexible regions that can deform to open gas discharge pathways when needed.
Solution Approach 2:
The cap-up incorporates local quality variations through different bridge part thicknesses, where the first bridge part has one thickness and the second bridge part has a different thickness, enabling the structure to be rigid in some areas and flexible in others for controlled gas release.
3Device complexity
If gas is discharged only through the piercing hole, then the structure remains simple, but the gas cannot be quickly discharged when internal pressure increases
Solution Approach 1:
The cap-up is divided into multiple bridge parts that create multiple potential gas discharge pathways. When internal pressure increases, these segmented structures can deform in sequence or simultaneously to open multiple channels for faster gas release compared to a single piercing hole.
Solution Approach 2:
The invention transitions from a single-point gas discharge (piercing hole) to a multi-dimensional gas discharge system where gas can escape through multiple pathways created by the deforming bridge parts, effectively adding spatial dimensions to the gas release mechanism.
Data Source
AI summary
A cylindrical secondary battery including an electrode assembly, a can accommodating the electrode assembly, a cap assembly electrically coupled to the electrode assembly and coupled to one side of the can to close an inlet of the can, and including a cap-up exposed to the outside, and a gasket between the cap assembly and the can. The cap-up may include a terminal part with a circular shape, a base part spaced apart from the terminal part and surrounding an outer side of the terminal part, and bridge parts configured to connect the terminal part to the base part and spaced apart from each other with a connection hole therebetween. A width of a part of each of the bridge parts connected to the terminal part may be less than a width of a part of each of the bridge parts connected to the base part.