Cylindrical Battery Sealing Structure for Low-Height Airtight Cells
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Solution Overview
Problem
Conventional batteries with grooves and crimping parts are prone to increased height, which reduces capacity density as the space occupied by the groove, gasket, and crimping part does not contribute to battery capacity.
Innovation Solution
A battery design featuring a cylindrical battery can with a sealing member that includes a sealing plate, a cap with a through hole, and gaskets to ensure airtightness without the need for a groove, allowing for a reduced height and increased capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a groove and crimping part are used to seal the battery can opening, then airtightness is ensured, but the battery height increases and capacity density decreases
Solution Approach 1:
The sealing plate integrates multiple functions: it seals the opening, provides electrical connection to the first electrode, and serves as a mounting base for the cap. This consolidation eliminates the need for separate grooves and reduces overall battery height while maintaining airtightness.
Solution Approach 2:
The sealing plate extends in the radial direction beyond the battery can opening, allowing the cap to be positioned outward rather than requiring axial space. This dimensional shift reduces battery height while preserving sealing functionality.
2Reliability
If a groove, gasket, and crimping part are disposed to seal the battery, then airtightness is achieved, but the space does not contribute to battery capacity
Solution Approach 1:
The sealing plate combines sealing, electrical connection, and structural support functions into a single component that is electrically connected to the first electrode. This integration eliminates dead space (groove and crimping regions) and maximizes the volume available for active materials, thereby increasing battery capacity.
Solution Approach 2:
The invention extracts the sealing function from the battery can wall itself (by using a separate sealing plate) and positions it optimally to minimize space occupation. The gasket is positioned only where necessary for sealing between the cap and battery can, eliminating unnecessary space consumption.
3Reliability
If the opening end of the battery can is bent inward and crimped to ensure airtightness, then sealing is achieved, but the battery height increases
Solution Approach 1:
The sealing plate serves as both the sealing surface and the electrical terminal connection point. By integrating these functions, the design eliminates the need for separate crimping operations that would increase battery height, while maintaining reliable airtightness through the gasket-sealing-plate assembly.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The proposed battery design reduces height while maintaining airtightness, thereby enhancing capacity density by utilizing the space more efficiently.
Implementation Method 1
the first gasket is interposed between the rib and the cylinder in a state of being compressed in a radial direction of the cylinder
Data Source
AI summary
A battery includes a battery can including a cylinder having a cylindrical shape and having an opening edge at one end, an electrode body, and a sealing member sealing an opening surrounded by the opening edge, in which the sealing member has a sealing plate electrically connected to a first electrode of the electrode body, a cap having a through hole corresponding to the sealing plate electrically insulated from the sealing plate, and a gasket that seals between the cylinder and the cap, the cap has a top plate having a ring shape and facing the cylinder, a side wall that is erected in an axial direction from a peripheral edge of the top plate and extends so as to overlap an outer surface of the cylinder, and a rib that is erected in the axial direction from the top plate inside of the side wall and extends so as to overlap an inner surface of the cylinder, the gasket is compressed in a radial direction of the cylinder between the rib and the cylinder, and the battery can and the cap are electrically connected to a second electrode of the electrode body.