Secondary Battery Vent Sealing Cap for One-Way Gas Release
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Solution Overview
Problem
Existing secondary batteries face safety risks due to the introduction of external oxygen during gas venting, which can lead to ignition or explosion.
Innovation Solution
A vent sealing cap with a body, intake port, exhaust port, and an opening/closing member that adjusts airflow based on pressure changes to prevent reverse oxygen introduction after gas discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a venting process is implemented to discharge internal gas to the outside, then the battery pressure is regulated and gas is discharged safely, but external air and oxygen are introduced into the battery, leading to potential ignition or explosion
Solution Approach 1:
The valve assembly incorporates a movable valve element that dynamically opens and closes based on pressure differential. When internal battery pressure exceeds external pressure, the valve opens to discharge gas. When internal pressure drops below external pressure, the valve automatically closes to prevent external air and oxygen from entering, thus resolving the contradiction between venting and preventing oxygen introduction
Solution Approach 2:
The valve assembly acts as an intermediary device between the battery interior and exterior environment. It selectively mediates gas flow by opening to allow internal gas discharge while closing to block external air entry, thus preventing oxygen introduction while maintaining pressure regulation functionality
2Reliability
If the exhaust port is positioned above the intake port, then discharged gas is prevented from re-entering the battery, but the device complexity increases
Solution Approach 1:
The exhaust port is positioned asymmetrically above the intake port rather than at the same level. This asymmetric arrangement utilizes gravity and pressure differential to ensure discharged gas flows outward and does not re-enter the battery through the intake port, improving gas discharge efficiency while maintaining a relatively simple structural design
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
Prevents ignition and explosion by ensuring gases are discharged safely while blocking reverse air entry, enhancing battery safety.
Implementation Method 1
the opening/closing member that is provided in the hollow within the body to open or close the connection between the intake port and the exhaust port while moving by the change in pressure of the intake port
Data Source
Figure 1
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AI summary
The present invention relates to a vent sealing cap for a secondary battery and a secondary battery including the same, and more particularly, to a vent sealing cap for a secondary battery, which is capable of preventing oxygen from being introduced reversely after a gas generated in the secondary battery is discharged to the outside to prevent the secondary battery from being ignited and improve safety, and a secondary battery including the same. The vent sealing cap for a secondary battery according to the present invention includes a body having a hollow therein, an intake port provided on the body, an exhaust port provided above a position, at which the intake port is disposed, on the body, and an opening/closing member provided in the hollow within the body to open or close connection between the intake port and the exhaust port while moving by a change in pressure of the intake port.