Thermoelectric Generator Assembly Thermal Expansion Management
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Solution Overview
Problem
Thermoelectric generator (TEG) devices are brittle, difficult to handle, and prone to thermal stresses due to thermal expansion mismatches, leading to reduced efficiency and increased manufacturing costs, especially in harsh environments like vehicles, where they require labor-intensive installation and are limited by thermal resistance and flat surface compatibility.
Innovation Solution
A thermoelectric generator assembly with a frame that includes a first and second frame member to retain TEG devices, a spacer for thermal expansion accommodation, and a power bus for electrical energy transmission, featuring a ledge for direct contact with heat sources and sinks, and a slip joint to manage thermal expansion differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple TEG devices are bundled together to generate useful power, then power generation capability is improved, but device complexity and handling difficulty increase
Solution Approach 1:
Multiple TEG devices are bundled together in a module assembly with common electrical connections and thermal management structures, combining individual devices into a unified power generation unit that delivers useful power while simplifying installation and maintenance
2Ease of operation
If TEG devices are encased into a module to simplify handling, then ease of operation is improved, but thermal resistance increases
Solution Approach 1:
Thermal interface materials and conductive structures are used as intermediaries between the TEG devices and heat source/sink, facilitating efficient heat transfer through the module assembly while maintaining structural integrity and ease of handling
3Reliability
If stress buffer layers are added to accommodate thermal expansion, then reliability is improved, but device complexity increases
Solution Approach 1:
The module assembly incorporates structures and materials designed to accommodate thermal expansion and contraction of TEG devices during temperature cycling, using expansion joints, flexible connections, or materials with matched thermal expansion coefficients to maintain reliability without excessive structural complexity
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 assembly simplifies handling and installation, reduces thermal resistance, enhances energy conversion efficiency, and allows for easier maintenance and upgrading by eliminating the need for separate stress relief layers and direct contact with non-flat surfaces, thereby improving power generation in varying temperature conditions.
Implementation Method 1
A thermoelectric generator (TEG) is a device that can generate electricity when a temperature differential is applied across the device
Implementation Method 2
The thermal interface or heat spreading plate 206 may be made of a material such as copper, aluminum nitride (AlN) or similar heat conductive material
Implementation Method 3
Because of thermal gradients and different thermal coefficients of expansion associated with different materials, thermally induced stresses may result
Data Source
AI summary
A thermoelectric generator assembly may comprise a frame that may include a first frame member and a second frame member. The first frame member and the second frame member are adapted to retain one or more thermoelectric generator devices in position therebetween for transferring heat energy through the one or more thermoelectric generator devices from a heat source to a heat sink to generate electrical energy. The thermoelectric generator assembly may also include a spacer positioned between the first frame member and the second frame member. A power bus may be included to provide the electrical energy generated by the one or more thermoelectric generator devices for powering an electrical device.