Tubular Thermoelectric Module Thermal Expansion Compensation
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Solution Overview
Problem
Thermoelectric modules used in motor vehicles face durability issues due to thermal expansion differences between components, leading to potential damage and reduced efficiency in converting thermal energy from exhaust gases into electric energy.
Innovation Solution
A tubular thermoelectric module design featuring concentric outer and inner tubes with strip-shaped structures that overlap to accommodate semiconductor elements, allowing for thermal expansion compensation through relative movement between the tubes, thereby minimizing stress on semiconductor elements and ensuring durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a thermoelectric module is used to convert thermal energy from exhaust gases into electric energy, then energy efficiency of the motor vehicle is improved, but durability of the module is reduced due to thermal expansion differences between components
Solution Approach 1:
The patent applies the thermal expansion principle by designing the thermoelectric module to utilize differential thermal expansion between the inner tube and outer tube. The inner tube is allowed to expand independently relative to the outer tube when exposed to thermal cycles, and the strip-shaped structures are configured to accommodate this expansion movement. This resolves the contradiction by converting the harmful thermal expansion effect into a functional design feature that protects semiconductor elements while maintaining energy conversion efficiency.
Solution Approach 2:
The patent implements dynamics by transitioning from a rigid fixed structure to a dynamic adjustable structure. The strip-shaped structures can change their configuration in response to thermal expansion, allowing the inner tube to move relative to the outer tube. This dynamic adaptation enables the module to maintain durability under thermal stress while continuing to function effectively for energy conversion.
2Stability of the object's composition
If the thermoelectric module components are rigidly fixed to each other, then structural stability is improved, but damage to semiconductor elements occurs due to thermal expansion stress
Solution Approach 1:
The patent introduces strip-shaped structures as intermediary elements between the inner tube and outer tube. These intermediaries facilitate controlled movement and accommodate thermal expansion differences without transmitting harmful stresses to the semiconductor elements. The strip-shaped structures act as a buffer zone that absorbs expansion forces while maintaining overall structural integrity.
Solution Approach 2:
The patent applies segmentation by dividing the connection between inner tube and outer tube into multiple discrete strip-shaped structures rather than a continuous rigid connection. This segmentation allows localized movement and stress distribution, enabling each strip to independently accommodate expansion while collectively maintaining structural stability.
3Reliability
If strip-shaped structures are used to connect inner tube and outer tube, then thermal expansion compensation is achieved, but device complexity increases
Solution Approach 1:
The patent employs thin strip-shaped structures that function as flexible connecting elements between the inner tube and outer tube. These thin film-like structures provide the necessary flexibility to accommodate thermal expansion while maintaining a relatively simple overall design. The simplicity of the strip shape minimizes manufacturing complexity compared to more complex mechanical compensation mechanisms.
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 compensates for thermal expansion, preventing damage to semiconductor elements and enhancing the durability and efficiency of thermoelectric modules in converting thermal energy from exhaust gases into electric energy.
Implementation Method 1
Thermoelectric materials which are used for that purpose are of such a type that they can convert thermal energy effectively into electric energy (Seebeck effect)
Implementation Method 2
Thermoelectric materials which are used for that purpose are of such a type that they can convert thermal energy effectively into electric energy (Seebeck effect) and vice versa (Peltier effect)
Implementation Method 3
the thermoelectric module is subjected to differences in thermal expansion of individual components. In order to provide a durable thermoelectric module, it is necessary to compensate for those differences in thermal expansion
Data Source
AI summary
A thermoelectric module extends in a longitudinal direction and includes an outer tube, an inner tube disposed within the outer tube and an interspace between the tubes. At least one first strip-shaped structure and one second strip-shaped structure are provided. The first strip-shaped structure extends from a first connection on the inner tube and the second strip-shaped structure extends from a second connection on the outer tube in opposite directions in at least one circumferential direction or in the longitudinal direction and at least partly form an overlap at least in the circumferential direction or in the longitudinal direction. At least one pair of semiconductor elements is disposed in the region of the overlap. A method for producing a thermoelectric module and a thermoelectric generator are also provided.