Battery Box Pressure Equalization Vent for Airtightness Testing
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Solution Overview
Problem
Existing pressure equalization devices for battery housings do not facilitate easy airtightness testing, as they lack a straightforward mechanism to introduce pressurized air and seal the housing effectively.
Innovation Solution
A pressure equalization device with a test configuration that allows air to escape through a bypass channel and an operational configuration where the bypass channel is closed, enabling air to escape through a gas-permeable and liquid-impermeable membrane, along with a valve element that deforms at a predetermined pressure difference to prevent overpressure, allowing for efficient airtightness testing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pressure equalization device with only a membrane is used, then pressure equalization is achieved, but airtightness testing becomes difficult
Solution Approach 1:
The lid is designed to be movable between two configurations: a first configuration where the bypass channel is open for airtightness testing, and a second configuration where the bypass channel is closed and the membrane covers the hole for pressure equalization. This dynamic switching capability resolves the contradiction by allowing the device to adapt its state based on the operational requirement.
Solution Approach 2:
The pressure equalization device is segmented into functional components: a bypass channel for testing, a membrane for pressure equalization, and a lid for configuration switching. This segmentation allows each component to serve its specific function while the overall system provides both testing capability and pressure equalization.
2Ease of operation
If a bypass channel is always open for easy testing, then airtightness testing is easy, but pressure equalization cannot be achieved
Solution Approach 1:
The bypass channel's state is dynamically controlled through the movable lid. When the lid is in the first configuration, the bypass channel is open for easy airtightness testing. When the lid moves to the second configuration, the bypass channel closes and the membrane covers the hole, enabling pressure equalization. This dynamic control resolves the contradiction between ease of testing and pressure equalization capability.
3Device complexity
If the lid is fixed in one position, then device complexity is reduced, but the device cannot switch between test and operational configurations
Solution Approach 1:
The lid is designed as a movable component that can switch between a first configuration (bypass channel open) and a second configuration (bypass channel closed, membrane covering the hole). This dynamic capability enables the device to adapt to different operational requirements (testing vs. pressure equalization) while maintaining a relatively simple overall structure, resolving the contradiction between device complexity and adaptability.
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
Enables straightforward airtightness testing by allowing pressurized air to be introduced into the battery box through a bypass channel and ensuring pressure equalization, while preventing overpressure through the membrane and valve element, thus enhancing the testing process.
Implementation Method 1
a membrane covering the fluid passage to equalize the pressure inside the housing with the ambient pressure outside the housing
Implementation Method 2
The valve element can be configured to deform, for example at a predetermined pressure difference between the inside and the outside of the battery box
Data Source
AI summary
The disclosure relates to a pressure equalization device for a battery box. The device comprises a cage defining a fluid passage, a lid mounted on the cage and a membrane covering the fluid passage to equalize the pressure inside the battery box with the ambient pressure outside the battery box. The lid is movable between a test configuration, in which air can escape through a bypass channel, and an operational configuration, in which the bypass channel is closed but air can escape through the membrane.