Vehicle Battery Pack Breathing Vent for Moisture-Aware Pressure Equalization
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Solution Overview
Problem
Current battery pack breathing vents fail to optimally mitigate moisture ingress, especially in wet environmental conditions, and do not effectively vent to dry the battery pack when conditions are favorable.
Innovation Solution
A system and method for controlling a breathing vent that includes sensors to measure pressure and humidity differentials, moisture conditions, and vehicle states to actively regulate airflow based on these factors, using a controller to manage the vent's operation to equalize pressure and humidity, minimizing moisture ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gas-permeable membranes are used in breathing vents, then pressure exchange is enabled while moisture ingress is mitigated, but moisture ingress cannot be optimally prevented in all wet environmental conditions
Solution Approach 1:
The breathing vent system transitions from a static gas-permeable membrane to a dynamic controllable valve mechanism that can open and close based on real-time environmental conditions. The controller monitors moisture sensors, weather data, and vehicle state to dynamically adjust vent operation, enabling the system to adapt to varying environmental conditions including heavy precipitation, flooding, and humidity levels that would overwhelm passive membranes.
Solution Approach 2:
The system implements feedback control by continuously monitoring internal battery pack humidity levels, external weather conditions, and vehicle motion state. This feedback loop allows the controller to make informed decisions about when to open or close the breathing vent, optimizing moisture prevention while maintaining pressure equalization functionality across diverse environmental conditions.
2Reliability
If battery packs are sealed to mitigate moisture ingress, then moisture protection is improved, but pressure differential from elevation changes can compromise battery pack integrity
Solution Approach 1:
The breathing vent employs a dynamic controllable valve that can open to equalize pressure when elevation changes create dangerous pressure differentials, then close to maintain the sealed protective environment. This dynamic operation allows the system to temporarily compromise the seal for pressure equalization while maintaining overall moisture protection during normal operation.
Solution Approach 2:
The controllable breathing vent acts as an intermediary mechanism between the sealed battery pack environment and the external atmosphere. It provides a controlled pathway for pressure equalization while maintaining the overall sealed structure, allowing the system to benefit from both sealing (moisture protection) and pressure equalization without permanently compromising either function.
3Ease of operation
If passive breathing vents are used, then pressure equalization occurs automatically, but the vents cannot actively dry the battery pack when environmental conditions are favorable
Solution Approach 1:
The system uses humidity sensors inside the battery pack to monitor internal moisture levels and feedback this information to the controller. When humidity levels exceed thresholds and environmental conditions are favorable (low external humidity, no precipitation), the controller activates the breathing vent to allow internal moisture to escape, actively drying the battery pack interior.
Solution Approach 2:
The breathing vent system performs self-service by using the existing pressure differential created during vehicle operation (especially uphill driving or elevation changes) to drive moisture out of the battery pack during favorable conditions. The system leverages natural environmental gradients without requiring additional energy input for active drying.
4Strength
If breathing vents remain open to equalize pressure, then pressure differential is prevented, but moisture ingress risk increases in wet conditions
Solution Approach 1:
The controller continuously monitors external weather conditions including precipitation sensors and humidity levels, along with internal battery pack moisture sensors. This feedback enables real-time decision-making about vent operation, closing the vent when external conditions indicate high moisture ingress risk while maintaining pressure balance through alternative means or timed operation.
Solution Approach 2:
The breathing vent transitions from a static open state to a dynamic controllable state that can open or close based on real-time conditions. The system dynamically adjusts vent operation to maintain pressure balance only when environmental conditions are favorable, and uses alternative pressure management strategies or timed opening/closing cycles when moisture ingress risk is high.
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 system effectively equalizes pressure and humidity to enhance battery pack performance and reliability by preventing moisture ingress and maintaining optimal internal conditions.
Implementation Method 1
Current breathing vents may utilize gas-permeable membranes to allow pressure exchange while mitigating moisture ingress
Implementation Method 2
changes in elevation can create a pressure differential between air inside the battery pack and the atmosphere
Data Source
AI summary
A method for controlling a breathing vent for a battery pack of a vehicle may include determining a pressure differential between an interior pressure in an interior of the battery pack and an exterior pressure on an exterior of the battery pack. The method further may include controlling the breathing vent to equalize the interior pressure with the exterior pressure based at least in part on the pressure differential.