Dual-Screen Battery Housing Venting for Fast Particle Retention
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Solution Overview
Problem
Battery housings require a venting and separating device that allows for quick pressure release with minimal pressure loss while preventing the escape of particles, particularly in the event of a cell defect, without causing mechanical stress or damage.
Innovation Solution
A venting and separating device comprising two serially connected separation screens with different screen openings, where the second screen is surrounded by the first and they overlap axially, allowing for effective particle separation from hot gas streams without increasing pressure loss, and can be configured to fit various housing geometries with a flat design.
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 concentric separation screens with different opening sizes. The first separation screen has larger openings for faster venting, while the second separation screen has smaller openings for better particle retention. This segmentation allows the system to achieve both high venting speed and effective particle filtration simultaneously.
2Object-affected harmful factors
If the housing is completely gas-tight, then foreign body ingress is prevented, but mechanical damage occurs due to pressure buildup
Solution Approach 1:
The separation screens are made with porous structures that have controlled opening sizes. These porous materials allow gas molecules to pass through while blocking larger particles such as lithium particles and foreign bodies. The porous structure provides both gas exchange capability and particle filtration in a single component.
3Stress or pressure
If emergency venting is enabled with membrane rupture, then sudden pressure compensation is achieved, but particle escape increases
Solution Approach 1:
The second separation screen with smaller openings is nested within the first separation screen with larger openings. This nested configuration creates multiple filtration stages: the first screen handles coarse particles and provides main venting pathways, while the second screen filters finer particles. Even under emergency pressure conditions, the nested dual-screen structure maintains particle retention while allowing pressure equalization.
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 enables controlled pressure release with minimal pressure loss and effective retention of particles, reducing the risk of mechanical damage and ensuring space for active components within the housing.
Implementation Method 1
a venting and separating device, in particular a venting filter, for a degassing unit of a housing with at least one first separation screen (10) having a plurality of first screen openings (12) and with a second separation screen (20) having a plurality of second screen openings (22)
Implementation Method 2
pressure compensation devices are known that include semipermeable membranes, for example, of extruded polytetrafluoroethylene (PTFE), that are gas-permeable but liquid-impermeable
Data Source
AI summary
A venting and separating device for a housing includes a first separation screen comprising first screen openings, and a second separation screen comprising second screen openings. The second separation screen is surrounded circumferentially by the first separation screen, the first separation screen and the second separation screen overlap each other in an axial direction, for intended mounting at the housing, the second separation screen completely engages across a housing opening for venting, and a wall of the first separation screen and/or a wall of the second separation screen is corrugated multiple times.