Aerosol Casing Vent Structure for Battery Overpressure Release
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Solution Overview
Problem
Aerosol generation devices face safety risks due to battery cell thermal runaway and swelling, leading to potential device destruction and user safety hazards from overpressure.
Innovation Solution
The device features an outer casing with a frame and outer wall that can rupture or bend when pressure exceeds a predetermined threshold, incorporating a weak area or slit to control the release of pressure and ensure safety, using materials like glass or polycarbonate for controlled rupture and improved design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rigid outer casing is used to maintain device integrity, then device strength is improved, but safety under overpressure deteriorates
Solution Approach 1:
The outer casing is segmented into a frame and an outer wall that can rupture independently. The outer wall is designed as a separate component that can fail in a controlled manner while the frame maintains structural integrity, allowing the device to withstand overpressure safely.
Solution Approach 2:
The outer wall incorporates a weak area with locally reduced mechanical properties (thinner section or pre-formed slit) compared to the rest of the structure. This local quality difference allows the weak area to rupture at lower pressures while other parts maintain strength, enabling controlled pressure release.
2Strength
If the outer wall is made thicker to prevent rupture, then device protection is improved, but safety under thermal runaway deteriorates
Solution Approach 1:
The casing structure is divided into a frame providing overall protection and an outer wall that can rupture. This segmentation allows the frame to maintain protective function while the outer wall serves as a pressure relief mechanism.
Solution Approach 2:
The outer wall has non-uniform thickness with a weak area that is thinner than other portions. This local quality variation creates a predetermined failure point that ruptures under overpressure from thermal runaway, preventing catastrophic failure of the entire device.
3Object-affected harmful factors
If a weak area is introduced to enable pressure release, then safety is improved, but device integrity deteriorates
Solution Approach 1:
The outer wall is segmented into different thickness zones, with a weak area having reduced thickness compared to the rest of the wall. This segmentation allows controlled rupture at the weak area while maintaining integrity of the overall device structure through the frame and stronger wall portions.
Solution Approach 2:
The weak area has locally modified mechanical properties (reduced thickness or pre-formed slit) that differ from the rest of the outer wall. This local quality change enables predictable pressure release at the weak area while the overall device integrity is maintained through the frame structure.
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
This solution minimizes damage to the device and ensures user safety by allowing controlled pressure release in case of overpressure, maintaining device integrity and comfort while addressing thermal runaway and swelling issues.
Implementation Method 1
the outer wall being configured to rupture and/or at least a portion of the outer wall is configured to bend and/or to be detached from the frame when the pressure inside the device is greater than a predetermined threshold pressure
Data Source
AI summary
An aerosol generating device extending along a longitudinal axis (X) and including an outside casing delimiting an inside part of the device, the inside part including a power supply device and a receiving cavity for receiving a cartridge.The outside casing includes a frame and an outer wall attached to the frame.The outer wall extends along the longitudinal axis (X).The outer wall is configured to rupture and/or at least a portion of the outer wall is configured to bend and/or to be detached from the frame when the pressure inside the device is greater than a predetermined threshold pressure.