Battery Pack Vent Filter Membrane and Desiccant
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Solution Overview
Problem
Electrified vehicle battery packs face the challenge of liquid water and water vapor entering through vent paths, which can lead to undesirable contact with internal components and potential damage.
Innovation Solution
A filtering device comprising a frame with a desiccant and a membrane that blocks liquid water while allowing water vapor to pass, positioned within the vent of the battery pack to equalize pressure and prevent liquid entry, utilizing a permeable membrane and adsorbing desiccant to manage moisture effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If vent paths are provided to equalize pressure, then pressure equalization is achieved, but liquid water and water vapor can enter the interior
Solution Approach 1:
A membrane is introduced as an intermediary component in the vent path that selectively allows water vapor to pass through while blocking liquid water. The membrane acts as a mediator between the pressure equalization function and the protection against liquid water ingress, enabling both objectives to be achieved simultaneously.
Solution Approach 2:
The membrane used in the vent path is a porous material with specific pore sizes that allow water vapor molecules to pass through while blocking larger liquid water droplets. This porous structure enables selective permeability based on the size and phase of water, resolving the contradiction between pressure equalization and liquid water protection.
2Object-affected harmful factors
If a desiccant adsorbs water vapor, then water vapor is reduced, but the device complexity increases
Solution Approach 1:
The membrane and desiccant are integrated into a single filtering device assembly that fits within the existing vent path. The components are combined in series within the same housing, allowing liquid water blocking and water vapor adsorption to occur sequentially without requiring separate systems or complex installations.
Solution Approach 2:
The filtering device performs multiple functions within a single component assembly: pressure equalization through the vent path, liquid water blocking through the membrane, and water vapor adsorption through the desiccant. This multi-functionality reduces overall system complexity by consolidating what would otherwise require separate components.
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
Effectively reduces the entry of liquid water and adsorbs water vapor, protecting internal components from moisture-related issues and ensuring the integrity of the battery pack.
Implementation Method 1
a membrane configured to block liquid from communicating through the at least one passageway to the interior
Implementation Method 2
the membrane is permeable to water vapor and repels liquid water
Implementation Method 3
a desiccant held by the frame
Data Source
AI summary
An exemplary battery pack filtering device includes, among other things, a frame that provides at least one passageway to communicate air through the frame to an interior of a battery pack, a desiccant held by the frame, and a membrane configured to block liquid from communicating through the at least one passageway to the interior.