E-vaping device cartridge with internal conductive element
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Solution Overview
Problem
E-vaping devices often experience overheating issues due to excess heat generated by the heating element, leading to degradation of pre-vapor formulations and a compromised sensory experience, especially when the pre-vapor formulation level is low.
Innovation Solution
A cartridge design featuring a conductive element with a higher temperature coefficient of electrical resistivity than the heating element, integrated into the dispensing interface, which establishes a bridge electrical circuit to control the heating element's power supply based on the pre-vapor formulation level, ensuring optimal temperature management and preventing overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the heating element receives excessive power for vapor generation, then the vaporization efficiency is improved, but the cartridge temperature increases causing overheating conditions
Solution Approach 1:
The conductive element embedded in the wicking material functions as a temperature sensor that provides real-time feedback to the control circuitry. The control circuitry monitors the resistance changes of the conductive element and adjusts the power supplied to the heating element accordingly, reducing power when temperature exceeds thresholds to prevent overheating while maintaining vapor generation efficiency.
Solution Approach 2:
The conductive element serves as an intermediary between the heating element and the control circuitry. It is positioned within the wicking material to directly sense the temperature at the vaporization interface, translating thermal conditions into electrical resistance signals that enable precise temperature control without direct contact between the heating element and control electronics.
2Quantity of substance
If the amount of pre-vapor formulation in the cartridge is reduced, then the device portability is improved, but the excess heat generation increases causing overheating
Solution Approach 1:
The control circuitry continuously monitors the resistance of the conductive element embedded in the wicking material, which changes with temperature. When the pre-vapor formulation level drops and insufficient material is available for effective heat dissipation, the system detects the resulting temperature rise through resistance changes and automatically reduces heating power to prevent overheating, enabling safe operation with smaller formulation quantities.
3Speed
If the heating element generates excessive heat, then the vaporization speed is improved, but the pre-vapor formulation degrades and reaction products form
Solution Approach 1:
The conductive element provides continuous temperature feedback through resistance measurements. The control circuitry uses this feedback to maintain the heating element temperature within an optimal range, ensuring rapid vaporization while preventing excessive heat that would cause formulation degradation or unwanted chemical reactions. The system dynamically adjusts power to balance vaporization speed with formulation stability.
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 effectively maintains the temperature of the dispensing interface below a threshold, preventing pre-vapor formulation degradation and enhancing the sensory experience by accurately controlling the heating element's power supply in response to the pre-vapor formulation level.
Implementation Method 1
a heating element coupled to the dispensing interface... configured to heat pre-vapor formulation drawn into the dispensing interface
Implementation Method 2
the conductive element may have a second temperature coefficient of electrical resistivity, and the second temperature coefficient of electrical resistivity may be greater than the first temperature coefficient of electrical resistivity
Data Source
AI summary
A cartridge for an e-vaping device includes a conductive element extending through an interior of a dispensing interface to which a heating element is coupled. The conductive element may have a greater temperature coefficient of electrical resistivity than the heating element. The dispensing interface may include a fibrous wicking material, and the conductive element may be woven through an interior of the fibrous wicking material. A temperature of the dispensing interface may be determined based on monitoring an electrical resistance of the conductive element. An amount of pre-vapor formulation may be determined based on an electrical resistance of the bridge electrical circuit to an electrical signal between the heating element and the conductive element through the dispensing interface.