Battery Enclosure Flange Seal Assembly for Thermal Venting
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Solution Overview
Problem
Existing sealing interfaces in traction battery enclosures are inadequate in preventing gas venting and thermal energy propagation during thermal events, which can compromise the integrity of the gasket seal and lead to contamination and moisture ingress.
Innovation Solution
The solution involves a flange-to-flange interface with a gasket seal sandwiched between the first and second flanges, where the flanges project outward and are spaced to maintain the gasket seal's integrity, with optional welding or mechanical fastening, to direct vented gas and thermal energy away from the seal, enhancing thermal dissipation and preventing contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the flanges are directly welded or fastened at the sealing interface, then the structural strength is improved, but the gasket seal integrity deteriorates due to thermal damage and contamination
Solution Approach 1:
The flange is divided into two distinct regions: a sealing surface that contacts the gasket and a structural region that provides mechanical strength. The sealing surface extends beyond the gasket contact area, creating a dedicated zone for structural attachment that is spatially separated from the sealing interface, thus preventing thermal and mechanical damage to the gasket during welding or fastening operations.
Solution Approach 2:
The extended sealing surface acts as an intermediary element between the gasket and the structural attachment points. It provides a thermal and mechanical buffer zone that protects the gasket from direct exposure to welding heat and fastening stresses, while still enabling strong structural connection through the extended flange region.
2Volume of moving object
If the flanges are positioned close together for compact design, then the enclosure size is reduced, but the gasket seal is exposed to vented gas and thermal energy
Solution Approach 1:
The sealing surface is extended in the radial direction beyond the gasket contact area, creating an additional dimensional zone that serves as a protective barrier. This radial extension provides a thermal and chemical buffer without significantly increasing the overall enclosure volume, as the extension is confined to the flange periphery.
Solution Approach 2:
The extended sealing surface, which could be considered excess material, is converted into a beneficial protective feature. It acts as a sacrificial barrier that absorbs thermal energy and prevents vented gas from reaching the gasket, transforming what might be seen as wasted space into an active protection mechanism.
3Temperature
If the flange-to-flange interface extends beyond the gasket seal, then thermal dissipation is improved, but the device complexity increases
Solution Approach 1:
The extended sealing surface performs multiple functions simultaneously: it provides the primary sealing contact area for the gasket, serves as a structural attachment zone for welding or fastening operations, and acts as a thermal barrier to protect the gasket from heat and vented gas. This multi-functionality eliminates the need for separate protective components, thereby reducing overall device complexity.
Solution Approach 2:
The sealing function and structural support function are merged into a single integrated flange structure. The extended sealing surface combines the roles of seal contact surface and structural attachment zone, eliminating the need for separate reinforcement elements or protective barriers, thus simplifying the overall design while improving thermal management.
Data Source
AI summary
An assembly includes a first piece of an enclosure having an interior area. The first piece has a first flange that projects outward from the interior area. The assembly also includes a second piece of the enclosure, the second piece including a second flange that projects outward from the interior area. The assembly further includes a gasket seal that is sandwiched between the first and second flanges. The first and second flanges are secured together at a flange-to-flange interface that is between the gasket seal and the interior area.