Blind Rivet Sealing for Battery Filling Port
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Solution Overview
Problem
Existing sealed battery technologies face a decrease in sealing strength and performance due to outward deformation around the through-hole caused by internal pressure rises, which compromises the seal integrity.
Innovation Solution
A sealed battery design incorporating a blind rivet with a flange and sleeve, where the through-hole has a tapered surface on the battery case and a matching tapered portion on the flange, with an elastic gasket sandwiched between them, allowing the sleeve to be plastic-deformed for enhanced sealing, even under pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a blind rivet with flange and sleeve is used to seal the through-hole, then the sealing structure is simple and easy to manufacture, but when internal pressure rises, the area around the through-hole deforms outward causing the gasket to be pushed out and contact with the sleeve becomes weak, resulting in decreased seal performance
Solution Approach 1:
A tapered surface is pre-formed on the peripheral portion of the through-hole on the outside surface of the battery case before sealing. This preliminary geometric feature ensures that when internal pressure causes outward deformation, the gasket is guided to press against the tapered surface, maintaining contact between the gasket and sleeve and preventing seal failure.
Solution Approach 2:
The tapered surface introduces a curved geometric feature on the outside surface of the battery case around the through-hole. This curvature is designed to work with the gasket's elastic deformation, guiding the compression force along the tapered surface to maintain reliable contact between the gasket and sleeve under pressure.
2Reliability
If the gasket is compressed between the flange and the through-hole, then sealing is achieved, but under internal pressure the gasket is pushed out by radially outward force, weakening contact with the sleeve
Solution Approach 1:
The tapered surface is pre-formed on the battery case before the sealing operation. This preliminary feature creates a geometric constraint that directs the gasket's compression force during sealing, ensuring that under internal pressure the gasket presses against the tapered surface rather than being pushed outward, thereby maintaining contact strength with the sleeve.
Solution Approach 2:
The outward radial force from internal pressure that normally pushes the gasket out and weakens sealing is converted into a beneficial force. The tapered surface guides this outward force to press the gasket against the sleeve, transforming the harmful effect into enhanced contact strength and maintained seal integrity.
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
This design effectively inhibits a decrease in sealing strength and performance by maintaining contact between the gasket and sleeve, ensuring a secure seal even when the area around the through-hole deforms outward due to internal pressure increases.
Implementation Method 1
a seal member that is an elastic body that seals between the through-hole and the plug member
Implementation Method 2
the through-hole is sealed by the flange, by a portion of the sleeve that is inserted into an inside the battery case being plastic deformed so as to bulge out
Data Source
AI summary
A sealed battery includes a filling hole, and a gasket and a blind rivet that seal the filling hole. A tapered surface that is inclined toward an inside of a battery case is formed around the filling hole of the battery case. The filling hole is sealed by the gasket and the blind rivet by the blind rivet plastic deforming.