Battery Safety Valve Venting With Weighted Cap Membrane
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Solution Overview
Problem
Lead storage batteries in vehicles generate gases during charging and discharging, leading to increased pressure and a risk of fire due to accumulated gas, necessitating a safety valve to discharge gas externally when pressure reaches a set level.
Innovation Solution
A safety valve with a simple structure, comprising a main body, sub body, cap membrane, and cover, where a protrusion on the cap membrane is in line contact with the sub body, allowing gas to be discharged through a discharge hole when pressure exceeds a predetermined level.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a safety valve is designed with a complex structure to ensure reliable gas discharge, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The safety valve is divided into multiple functional components: a cap membrane that responds to pressure changes, a sub body with discharge holes, and a main body structure. This segmentation allows each component to perform its specific function independently, ensuring reliable gas discharge while keeping the overall structure manageable and not overly complex.
2Reliability
If the cap membrane covers a large area to ensure complete gas discharge, then the gas discharge effectiveness is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The cap membrane is designed with specific local features including a protrusion at its center and designated contact points with the sub body. Rather than requiring uniform coverage across the entire membrane surface, the critical gas discharge function is localized to specific areas where the membrane contacts the sub body structure, simplifying manufacturing while maintaining effectiveness.
3Reliability
If the protrusion contact area between cap membrane and sub body is increased to improve sealing, then the pressure maintenance capability is improved, but the operating pressure error increases
Solution Approach 1:
The contact between the protrusion and sub body is designed to be dynamic rather than fixed. The cap membrane can move relative to the sub body in response to pressure changes, allowing the contact area to adjust automatically. This dynamic interaction maintains effective sealing at operating pressures while allowing for precise pressure response without excessive contact area that would cause pressure errors.
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 safety valve effectively discharges gas to maintain a constant pressure in the battery, reducing the risk of fire and improving the function and lifetime of the battery.
Implementation Method 1
The cap membrane is formed so that a cross section is formed in a '⊂' shape to cover an upper portion of the sub body due to a weight of the cap membrane
Implementation Method 2
a safety valve configured to maintain a constant pressure in a battery cell by discharging gas to the outside when a pressure in the battery cell reaches a set pressure
Data Source
AI summary
A safety valve mounted on a battery includes a main body which has a hollow structure formed so that a top communicates with a bottom and a discharge hole in one side surface of an upper portion, a sub body which is formed to protrude from an inner circumferential surface of the main body where a through hole is formed in one side surface of a lower portion of the sub body, a cap membrane of which a cross section has a “⊂” shape so that the cap membrane is in close contact with an upper portion of the sub body to close the upper portion of the sub body due to a weight of the cap membrane or moves upward from the upper portion of the sub body to open the upper portion of the sub body and which has a circular cap shape, and a cover which opens or closes the upper portion of the main body, and a protrusion is formed on an inner circumferential surface of an end portion of the cap membrane.