Thermoelectric module with a heat conducting layer and method of manufacturing a thermoelectric module
A thermoelectric module includes a cold side, a hot side and thermoelectric elements disposed between the two sides. At least one heat conducting layer is disposed between the thermoelectric elements and at least the cold side or the hot side and the heat conducting layer can be compressed. A method for producing a thermoelectric module having at least one heat conducting layer is also provided.
1. A tubular thermoelectric module, comprising:
an inner tube and a calibrated outer tube, one of said inner and calibrated outer tubes forming a cold side of the tubular thermoelectric module, and the other of said inner and calibrated outer tubes forming a hot side of the tubular thermoelectric module;
annular or annular segment-shaped thermoelectric elements disposed on said inner tube between said inner tube and said calibrated outer tube;
electrically conducting bridge elements electrically conductively interconnecting said annular or annular segment-shaped thermoelectric elements and forming a first tubular assembly with an outer circumferential surface;
at least one compressible heat conducting layer disposed on said outer circumferential surface between said annular or annular segment-shaped thermoelectric elements and at least one of said inner tube or said calibrated outer tube, said at least one compressible heat conducting layer having a thickness;
said at least one compressible heat conducting layer being compressed by said calibrated outer tube by at least 5 Vol.-% in a temperature range of 80 to 550° C. at a surface pressure of up to 60 Newton/cm 2 and thus being reduced in its thickness; and
said calibrated outer tube being disposed outside said at least one compressible heat conducting layer.
2. The thermoelectric module according to claim 1 , wherein said at least one compressible heat conducting layer is a film or foil.
3. The thermoelectric module according to claim 1 , which further comprises an outer wall of the tubular thermoelectric module, and an adhesive attaching said at least one compressible heat conducting layer at least to said outer wall or in addition to said thermoelectric elements.
4. The thermoelectric module according to claim 1 , wherein said at least one compressible heat conducting layer contains a heat conducting paste.
5. The thermoelectric module according to claim 1 , wherein said at least one compressible heat conducting layer contains a silicone elastomer.
6. The thermoelectric module according to claim 1 , wherein said at least one compressible heat conducting layer is reinforced with fibers.
7. A method for manufacturing a tubular thermoelectric module, the method comprising the following steps:
a) providing an inner tube forming a cold side or a hot side of the tubular thermoelectric module;
b) placing annular or annular segment-shaped thermoelectric elements on the inner tube;
c) electrically conductively interconnecting the annular or annular segment-shaped thermoelectric elements using electrically conducting bridge elements, to produce a first tubular assembly with an outer circumferential surface;
d) placing a compressible heat conducting layer on the outer circumferential surface, the heat conducting layer having a thickness;
e) providing an outer tube forming a hot side or a cold side of the tubular thermoelectric module; and
f) calibrating the outer tube to compress the compressible heat conducting layer by at least 5 Vol.-% in a temperature range of 80 to 550° C. at a surface pressure of up to 60 Newton/cm 2 and thus reducing the thickness of the compressible heat conducting layer.
8. The method according to claim 7 , which further comprises additionally placing a second heat conducting layer between the inner tube and the annular or annular segment-shaped thermoelectric elements.
9. The method according to claim 7 , which further comprises plastically deforming only the outer tube by the calibrating step.
10. The thermoelectric module according to claim 1 , wherein said at least one compressible heat conducting layer is disposed on said outer circumferential surface between said annular or annular segment-shaped thermoelectric elements and said calibrated outer tube and an additional heat conducting layer is disposed between said inner tube and said thermoelectric elements.
11. The thermoelectric module according to claim 1 , wherein only said calibrated outer tube is plastically deformed.