Battery Enclosure Vent Assembly for Sealing and Overpressure Relief
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Solution Overview
Problem
Battery enclosures in electric vehicles face challenges in maintaining structural integrity and sealing against water ingress while accommodating pressure changes and venting overpressure conditions during thermal runaway events.
Innovation Solution
A vent assembly comprising a housing with unidirectional and equalization valves, a bracket for attachment, and a protective cover, designed to equalize pressure, vent overpressure, and protect against moisture and debris, using a unidirectional valve to prevent oxygen ingress and an equalization valve to manage pressure changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the battery enclosure is made fully sealed to prevent water ingress and protect against external elements, then protection against moisture and debris is improved, but pressure equalization and venting capabilities deteriorate
Solution Approach 1:
The vent assembly is divided into separate functional components: a unidirectional valve for preventing oxygen ingress, an equalization valve for pressure balance, and a protective cover for debris protection. Each component performs a specific function, allowing the system to maintain sealing while accommodating pressure changes and venting requirements.
Solution Approach 2:
The vent assembly housing integrates multiple valve types (unidirectional valve and equalization valve) into a single multi-functional unit. This universal component provides both pressure equalization and overpressure venting capabilities while maintaining the sealed enclosure's protection against moisture and debris.
2Reliability
If the enclosure maintains a tight seal to ensure structural integrity, then strength and reliability are improved, but pressure release during thermal runaway events deteriorates
Solution Approach 1:
The unidirectional valve is pre-configured to open in response to overpressure conditions, providing preliminary protection against thermal runaway by directing exhaust away from the battery enclosure. The equalization valve similarly prepares for pressure changes by allowing bidirectional flow to prevent vacuum or overpressure damage.
Solution Approach 2:
The vent assembly housing acts as an intermediary component between the sealed battery enclosure and the external environment. It provides a controlled interface that allows pressure release and thermal runaway venting while maintaining the overall sealing integrity of the enclosure through its integrated valve system.
3Adaptability or versatility
If valves are exposed to the external environment for pressure equalization, then pressure control is improved, but susceptibility to debris and water ingress deteriorates
Solution Approach 1:
The unidirectional valve and equalization valve are nested within the protective cover and housing structure. This nested arrangement allows the valves to perform their pressure control functions while being physically protected from external debris, water, and environmental contaminants by the enclosing cover and housing.
Solution Approach 2:
The protective cover and housing form a protective shell around the valves. This shell structure maintains valve functionality for pressure equalization while providing a barrier against debris and water ingress, effectively separating the functional valve components from harmful external factors.
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 vent assembly effectively maintains structural integrity and sealing, preventing oxygen ingress and moisture entry while efficiently venting overpressure, thus ensuring safety and reliability of the battery enclosure.
Implementation Method 1
The unidirectional valve is attached to the first valve mount
Implementation Method 2
the equalization valve is attached to the second valve mount
Data Source
AI summary
A vent assembly for a sealed enclosure, such as a battery enclosure for an electric vehicle, is provided. The vent assembly includes a housing, a first valve, a second valve, and a protective cover. The housing includes a first valve mount and a second valve mount. The first valve is attached the first valve mount, and the second valve is attached to the second valve mount. A bracket may also be included. The bracket includes a body and support arms extending from the body. The support arms are attached to an inner surface of the housing. The support arms are configured to attach the housing to an enclosure surface. The first valve is a unidirectional valve, while the second valve may be an equalization valve or a unidirectional valve.