Battery Housing Vent Filter for Fast Degassing and Particle Retention
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Solution Overview
Problem
Existing battery housings face challenges in enabling quick venting with minimal pressure loss while preventing the escape of particles, particularly in the event of sudden pressure increases due to battery cell failures, and in maintaining a gas-tight seal against foreign bodies and moisture.
Innovation Solution
A venting and separating device comprising two serially arranged separation screens with different screen openings, one of which is corrugated, allowing for controlled gas discharge with minimal pressure loss and effective particle retention, and a semipermeable membrane for additional protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single separation screen is used for venting, then particle retention is achieved, but pressure loss increases and venting speed decreases
Solution Approach 1:
The single separation screen is divided into two serially arranged separation screens with different screen opening sizes. The first screen has larger openings for coarse particle filtration, while the second screen has smaller openings for fine particle filtration. This segmentation allows each screen to be optimized for its specific function, maintaining high venting speed while achieving effective particle retention.
2Object-affected harmful factors
If the housing is made completely gas-tight, then protection against foreign bodies and moisture is improved, but pressure buildup occurs during temperature fluctuations and charging/discharging
Solution Approach 1:
The venting opening is equipped with a locally optimized filtration system consisting of two separation screens with different pore sizes. This local quality enhancement allows the housing to maintain overall gas-tightness for protection against foreign bodies and moisture, while the specific venting location provides controlled gas exchange to relieve internal pressure buildup during temperature fluctuations and battery operation.
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 device ensures rapid venting with minimal pressure loss and prevents particle escape, maintaining a gas-tight seal against foreign bodies and moisture, while allowing for efficient use of space within the housing.
Implementation Method 1
pressure compensation devices are known that include semipermeable membranes, for example, of extruded polytetrafluoroethylene (PTFE), that are gas-permeable but liquid-impermeable
Implementation Method 2
A wall of the first separation screen and/or a wall of the second separation screen is corrugated multiple times
Data Source
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AI summary
Embodiments concern a venting and separating device (100), in particular a venting filter, for a degassing unit of the housing (50), in particular of a battery housing of a traction battery of a motor vehicle. The venting and separating device (100) includes at least one first separation screen (10) including a plurality of first screen openings (12), and a second separation screen (20) including a plurality of second screen openings (20), wherein the second separation screen (20) is surrounded circumferentially by the first separation screen (10), and the two separation screens (10, 20) overlap each other in axial direction (70). For intended mounting at the housing (50), the second separation screen (22) completely engages across a housing opening (52) provided for venting. In addition, the embodiments concerns a housing (20) with a venting and separating device (100).