PCM Thermal Actuator Switch for Passive Heat Transfer Control
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Solution Overview
Problem
Thermal management is often required in electronic devices and systems to maintain operational efficiency and prevent damage from excessive heat, with existing solutions being inadequate for passive and efficient temperature control.
Innovation Solution
A phase change material (PCM)-based conductive thermal actuator switch that uses a piston mechanism to actively form or break thermal connections between a heat source and a heat sink, utilizing phase change materials to expand or contract based on temperature, thereby controlling thermal energy transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If passive thermal regulation is implemented using phase change materials, then power consumption is reduced, but thermal management effectiveness is insufficient
Solution Approach 1:
The system uses the heat from the battery itself to drive the phase change material, which then activates the piston to open the thermal valve. This self-powered mechanism eliminates the need for external power sources while maintaining effective thermal management control
Solution Approach 2:
The patent utilizes the phase transition of the phase change material (from solid to liquid or vice versa) at specific temperature thresholds to trigger piston movement. This phase transition serves as the activation mechanism that automatically opens or closes the thermal valve based on battery temperature conditions
2Reliability
If thermal connections are continuously maintained, then thermal energy transfer is maximized, but operational efficiency is reduced due to unnecessary cooling
Solution Approach 1:
The thermal valve transitions from a static open/closed state to a dynamic, controllable state that can adjust thermal connectivity based on real-time temperature conditions. The piston mechanism enables the valve to dynamically respond to temperature changes, opening when needed and closing when the battery is within the optimal temperature range
Solution Approach 2:
The system incorporates inherent thermal feedback through the phase change material that responds to battery temperature. When the battery temperature reaches the phase change threshold, the material transitions phase, triggering the piston to open the valve and enable cooling. When cooled below the threshold, the material returns to its original state, closing the valve and preventing unnecessary cooling
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
Passively regulates thermal energy transfer by expanding or contracting to maintain devices within specified temperature ranges, enhancing operational efficiency and preventing damage while reducing power consumption.
Implementation Method 1
a phase change material configured to (i) expand to move a surface of the piston into a first position and (ii) contract to allow the surface of the piston to move into a second position
Implementation Method 2
Different ones of the thermal actuator switches include different phase change materials that expand or contract at different temperatures
Data Source
AI summary
An apparatus includes multiple thermal actuator switches configured to control a transfer of thermal energy. The thermal actuator switches are arranged in a stacked configuration. Each switch includes first and second plates and a piston movable between the plates. Each switch also includes a phase change material configured to (i) expand to move a surface of the piston into a first position and (ii) contract to allow the surface of the piston to move into a second position. The surface of the piston thermally contacts the first plate and increases thermal energy transfer between the plates when in one of the first and second positions. The surface of the piston is spaced apart from the first plate and decreases thermal energy transfer between the plates when in another of the first and second positions. Different ones of the switches include different phase change materials that expand or contract at different temperatures.