Battery Venting Layout for Aerosol Devices Under Degassing Pressure
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Solution Overview
Problem
Aerosol generation devices powered by batteries are prone to leaks or degassing events, which can lead to high pressures, ejection of hot materials, and potential explosions, posing safety risks to users, especially when the device is held in the hand or near the face.
Innovation Solution
The device incorporates a vent point on the battery surface for controlled fluid release, a fluid directing arrangement to guide the fluid away from the mouth end, and features like thermal insulation and anti-ejection means to manage pressure and contain ejected materials, reducing the risk of explosions and chemical exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a battery is used to power the aerosol generation device, then the device can operate portably and generate aerosol through heating, but the battery may experience leaks or degassing events that cause high pressures, eject hot materials, and potentially explode
Solution Approach 1:
The patent extracts the harmful degassing function from the battery by providing a dedicated vent point that separates the gas release location from the battery housing. This allows the dangerous pressure relief to occur at a controlled external point rather than within the device housing, preventing explosions and hot material ejection while maintaining portable operation.
Solution Approach 2:
The vent point acts as an intermediary element between the battery's internal pressure buildup and the external environment. It provides a controlled pathway for gas and fluid release, mediating the dangerous pressure release process to prevent direct ejection of hot materials while maintaining the portability benefit of battery-powered operation.
2Reliability
If the vent point is positioned on the battery surface, then fluid can be released preferentially during degassing, but the fluid may still reach the mouth end and cause harm to the user
Solution Approach 1:
The patent employs asymmetric positioning of the vent point on the battery surface, specifically locating it away from the mouth end of the device. This asymmetric arrangement ensures that during degassing events, the preferential fluid release path does not directly reach the user's mouth area, thereby maintaining controlled release while preventing chemical exposure harm.
Solution Approach 2:
The vent point is positioned in a spatial location that changes the dimensional relationship between the fluid release path and the mouth end. By placing the vent point at a different orientation and distance from the mouth end, the patent creates a geometric arrangement where even preferential fluid release does not result in harmful chemical exposure at the user interface.
3Object-affected harmful factors
If thermal insulation is added to manage heat transfer from ejected materials, then the risk of fire and harm to user is reduced, but the device complexity increases
Solution Approach 1:
The patent applies thermal insulation materials around the battery and vent point area before any degassing event can occur. This beforehand cushioning approach prepares the thermal environment in advance, so when hot materials are ejected during degassing, the pre-positioned insulation immediately reduces fire risk and user harm without requiring active response or additional components during the event.
Solution Approach 2:
The patent utilizes thin film thermal insulation materials that can be applied as flexible layers around critical components. These thin film solutions provide effective thermal protection against fire risk from ejected materials while minimizing the added complexity and bulk compared to rigid insulation structures.
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 design effectively directs fluid and contains ejected materials, minimizing the risk of explosions and chemical exposure, enhancing user safety by guiding fluid away from the mouth end and using thermal insulation to manage heat transfer.
Implementation Method 1
a vent point in an outer surface of the battery, the vent point arranged such that fluid is released preferentially from the vent point during degassing of the battery
Implementation Method 2
using thermal insulation to manage heat transfer
Data Source
AI summary
An aerosol generating device including: a housing having a mouth end and an opposing end, the opposing end having a vent hole; a battery within the housing, the battery having a vent point in an outer surface of the battery, the vent point arranged such that fluid is released preferentially from the vent point during degassing of the battery; and a fluid directing arrangement within the housing. The fluid directing arrangement is configured to define a fluid flow path from the vent point of the battery to the vent hole of the housing.