Cylindrical Battery Vent Plate Separation for Clear Gas Discharge
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Cylindrical secondary batteries face challenges in maximizing gas discharge while maintaining operational stability due to blocked or narrowed gas outlets caused by the rupture of vent plates, which restrict the efficient release of internal gas.
Innovation Solution
A cap assembly design featuring a vent plate with notches, a support plate, and an insulating member that allows the vent plate to separate from the cap assembly during gas discharge, expanding the gas discharge passage and enhancing the gas discharge rate and amount.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the vent plate is fixed on the cap up during rupture, then the cap assembly maintains structural stability, but the gas outlet is blocked or narrowed due to the ruptured vent plate
Solution Approach 1:
The cap assembly is divided into multiple independent components: the cap up, vent plate, support plate, and cap down. The vent plate is segmented from the cap assembly structure, allowing it to rupture and separate independently while the cap up remains fixed and stable. This segmentation enables the vent plate to be discarded after serving its protective function, clearing the gas discharge path.
Solution Approach 2:
The vent plate is designed as a disposable component that is discarded after rupture. Once the vent plate ruptures due to gas pressure, it separates from the cap assembly and is left behind in the can, while the cap up and support plate remain intact. This discarding mechanism ensures the gas discharge passage remains clear without compromising the structural stability of the remaining cap assembly.
2Strength
If the vent plate is covered by the cap up during rupture, then the cap assembly maintains structural integrity, but the gas discharge passage is blocked
Solution Approach 1:
The support plate acts as an intermediary component between the vent plate and cap down. It provides a stable mounting structure for the vent plate while being independently supportable from the cap up. When the vent plate ruptures, the support plate maintains the structural integrity of the cap assembly and provides a clear path for gas to flow from the can opening, preventing blockage by the ruptured vent plate.
3Productivity
If the cap assembly is deformed to maximize gas discharge, then the gas discharge effect is enhanced, but the operational stability may be compromised
Solution Approach 1:
The cap assembly transitions from a static structure to a dynamic system during gas discharge. The vent plate and cap down are designed to deform and separate in response to gas pressure, maximizing the gas discharge effect. Meanwhile, the cap up remains fixed and stable, maintaining operational stability. This dynamic design allows different parts of the cap assembly to have different degrees of flexibility appropriate to their functions.
Data Source
AI summary
An embodiment of the present invention relates to a cylindrical secondary battery comprising: a cylindrical can having one opened end to form an opening; an electrode assembly accommodated in the cylindrical can; and a cap assembly including a vent plate which is disposed on the outermost side in the direction away from the opening and which has at least one notch, a cap down which is disposed to be spaced apart from the vent plate in the direction of the opening and which is electrically connected to the electrode assembly, a support plate which is disposed between the vent plate and the cap down so as to be coupled to the vent plate, and an insulating member which is inserted between the support plate and the cap down to insulate the support plate and the cap down from each other, wherein, when the gas inside the can is discharged toward the opening, the vent plate is ruptured to be separated from the cap assembly.