Battery Pack Pressure Relief Device with Recessed Hat Portion
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Solution Overview
Problem
Electric vehicle battery packs face pressure buildup due to gas accumulation from failed sealed enclosures, requiring a controlled and directed release mechanism to prevent damage.
Innovation Solution
A pressure relief device with an adhesive attachment system, featuring a hat portion with an outer ring and recessed inner portion, allows controlled venting of gases through a strategically sized opening, ensuring safe release without external bursting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a pressure relief device is installed on the battery pack, then gas release is enabled and pressure buildup is prevented, but the structural integrity and sealing of the battery pack may be compromised
Solution Approach 1:
The pressure relief device is segmented into distinct functional components: a hat portion for pressure resistance, an adhesive layer for controlled attachment, and a defined opening for gas release. This segmentation allows each component to optimize its specific function while maintaining overall structural integrity.
Solution Approach 2:
The adhesive is applied locally in a ring configuration around the opening rather than uniformly across the entire hat portion. This localized adhesive application provides sufficient attachment for structural integrity while leaving the center opening clear for gas release, resolving the contradiction between sealing and venting.
2Productivity
If the opening diameter is increased for better gas release, then pressure relief efficiency improves, but the structural strength of the battery pack outer surface decreases
Solution Approach 1:
The solution moves from a two-dimensional opening in the outer surface to a three-dimensional recessed structure. The hat portion extends outward and recesses inward to form a cavity, allowing the opening diameter to be larger while the recessed walls provide additional structural support and distribute stress.
Solution Approach 2:
The opening is nested within the recessed cavity formed by the hat portion. This nested structure allows the opening to be larger than it would be in a flat surface while the surrounding recessed walls provide structural reinforcement, effectively nesting the functional opening within a structural framework.
3Reliability
If adhesive is applied around the opening for secure attachment, then the device remains firmly attached to the battery pack, but the adhesive may interfere with gas flow if positioned incorrectly
Solution Approach 1:
The adhesive is applied locally in a ring configuration at the periphery of the opening rather than across the entire hat portion or blocking the opening. This localized application ensures firm attachment to the battery pack outer surface while leaving the central opening and gas flow path completely clear.
Solution Approach 2:
The adhesive acts as an intermediary element positioned between the hat portion and the battery pack outer surface. It provides the bonding function needed for reliable attachment while its ring configuration specifically avoids interfering with the gas flow through the opening, mediating between attachment and flow requirements.
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 pressure relief device effectively manages pressure by allowing controlled gas release, preventing damage to the battery pack while maintaining structural integrity against external pressures.
Implementation Method 1
an adhesive arranged around an opening in the outer surface of the battery pack and a hat portion arranged over the opening. The hat portion includes an outer ring portion attached to the outer surface of the battery pack via the adhesive
Data Source
AI summary
A pressure relief device attached to an outer surface of a battery pack includes an adhesive arranged around an opening in the outer surface of the battery pack and a hat portion arranged over the opening. The hat portion includes an outer ring portion attached to the outer surface of the battery pack via the adhesive and an inner portion that is recessed from the outer surface of the battery pack to form a gap between the opening and the inner portion. A diameter of the inner portion is greater than a diameter of the opening, and a diameter of the gap is greater than the diameter of the opening.