Air-Permeable Liquid-Tight Seals for Battery Module Pressure Equalization
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Solution Overview
Problem
Energy storage systems, particularly in electric vehicles, face challenges in pressure equalization between battery module compartments and the external environment, which can lead to mechanical stress and potential hazards due to pressure differentials.
Innovation Solution
A venting arrangement with air-permeable, liquid-tight seals is implemented to define air channels between battery module compartments and the external environment, allowing for pressure equalization through airflow, while maintaining a sealed system to prevent contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the battery module compartments are hermetically sealed to prevent contamination, then the system reliability is improved, but pressure equalization becomes difficult causing mechanical stress
Solution Approach 1:
The patent employs air-permeable membranes as sealing elements that allow air molecules to pass through while maintaining a liquid-tight seal. These porous sealing elements enable pressure equalization between battery module compartments and the external environment, preventing pressure differentials that would otherwise cause mechanical stress on connections and housing, while still maintaining system integrity and preventing contamination.
2Stress or pressure
If air channels are introduced for pressure equalization, then pressure differentials are reduced, but liquid-tight sealing becomes more challenging
Solution Approach 1:
The patent utilizes air-permeable, liquid-tight sealing elements with controlled porosity that permit air flow for pressure equalization while blocking liquid penetration. These specialized porous materials maintain sealing effectiveness by allowing gas molecules to pass through their microstructure while their surface properties and pore configuration prevent liquid ingress, thus resolving the contradiction between pressure equalization and sealing effectiveness.
Solution Approach 2:
The sealing system employs composite structures combining air-permeable membranes with liquid-repellent properties. These composite sealing elements integrate multiple functional characteristics: porosity for air flow, hydrophobicity or surface tension properties for liquid rejection, and structural integrity for maintaining the seal. This composite approach enables simultaneous achievement of pressure equalization and reliable liquid-tight sealing.
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
This solution effectively manages pressure differentials, reduces mechanical stress on connections, and ensures the integrity of the battery module compartments by allowing air to flow in or out based on pressure changes, thereby protecting the system from overpressure conditions.
Implementation Method 1
The venting arrangement is configured with an air-permeable, liquid-tight seal at least between (i) the plurality of battery module compartments and (ii) the external environment
Data Source
AI summary
In an embodiment, an energy storage system includes a battery module mounting area with a plurality of battery module compartments, each of the battery module compartments configured to house a respective battery module, and a venting arrangement configured to define a set of air channels that permits pressure equalization between the plurality of battery module compartments and an external environment. The venting arrangement is configured with an air-permeable, liquid-tight seal at least between (i) the plurality of battery module compartments and (ii) the external environment.