Battery Vent Valve Membrane Bypass for Rapid Pressure Release
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Solution Overview
Problem
Current vent valves in battery packs of electric vehicles, particularly spring-opened ones, fail to efficiently manage pressure changes and rapid pressure release during abnormal battery states, such as exhaust conditions, which can lead to safety concerns.
Innovation Solution
A vent valve design incorporating a breathable membrane with a movable valve core and gas channels that shifts positions under gas pressure, allowing airflow to bypass the membrane and facilitate rapid pressure release when internal pressure exceeds safe limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a spring-opened vent valve is used to balance pressure, then pressure balance is achieved under normal conditions, but rapid pressure release is insufficient during abnormal states
Solution Approach 1:
The vent valve employs a dynamic valve core that can transition between different positions (first position blocking gas channels, second position opening them) based on pressure conditions. This dynamic adjustment allows the valve to provide controlled pressure balance during normal operation while enabling rapid pressure release during abnormal states, resolving the contradiction between reliability and productivity.
2Object-affected harmful factors
If airflow must pass through the breathable membrane, then filtration is provided, but pressure release speed is limited
Solution Approach 1:
The vent valve system is segmented into two distinct airflow paths: one through the breathable membrane for filtered pressure balance, and another through the gas channels for rapid unfiltered pressure release. This segmentation allows each path to optimize for its specific function, with the gas channels providing a direct, high-speed route that bypasses the membrane's filtration limitation.
Solution Approach 2:
The valve core acts as an intermediary that controls airflow routing. It can direct pressure differentials to either the breathable membrane path or the gas channel path depending on the severity of the pressure condition, enabling the system to switch between filtered and unfiltered ventilation modes as needed.
3Speed
If the valve core moves freely under gas pressure, then rapid response is achieved, but connection with central channel may be lost
Solution Approach 1:
The system incorporates feedback through the pressure differential itself, which continuously monitors the pressure state and automatically adjusts the valve core position. When pressure differential increases during abnormal states, it naturally drives the valve core to the second position, ensuring the connection with the central channel is maintained precisely when needed for rapid pressure equalization.
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 vent valve effectively balances internal and external pressures during normal conditions and rapidly discharges excess gas during abnormal states, ensuring safety by maintaining connection with the central channel and allowing airflow through gas channels, thus preventing pressure buildup.
Implementation Method 1
The valve core is configured to move from a first position to a second position relative to the base under a gas pressure
Data Source
AI summary
A vent valve includes a breathable membrane. The vent valve can be in a battery assembly of a vehicle. The vent valve comprises a base defining a central channel and a valve core movably connected with the base and including at least one first gas channel. The valve core is configured to move from a first position to a second position relative to the base under a gas pressure. When the valve core is in the second position, the first gas channel is at least partially opened to allow some airflow to bypass the breathable membrane.