CN111064391B - High-energy-conversion-efficiency cascade thermoelectric power generation unit - Google Patents
High-energy-conversion-efficiency cascade thermoelectric power generation unit Download PDFInfo
- Publication number
- CN111064391B CN111064391B CN201911406029.9A CN201911406029A CN111064391B CN 111064391 B CN111064391 B CN 111064391B CN 201911406029 A CN201911406029 A CN 201911406029A CN 111064391 B CN111064391 B CN 111064391B
- Authority
- CN
- China
- Prior art keywords
- temperature
- thermoelectric
- monomer
- power generation
- end electrode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N11/00—Generators or motors not provided for elsewhere; Alleged perpetua mobilia obtained by electric or magnetic means
- H02N11/002—Generators
Abstract
The invention belongs to the technical field of thermoelectric power generation, and particularly relates to a high-energy-conversion-efficiency cascade thermoelectric power generation unit which comprises a hot end electrode, a P/N type high-temperature thermoelectric monomer, a P/N type medium-temperature thermoelectric monomer and a cold end electrode which are sequentially arranged from top to bottom; the hot end electrode and the cold end electrode are both in a boot shape, and both the electrodes are formed by brazing and connecting a conducting strip and an electrode cap; a hot end electrode cap is respectively arranged at the two ends below the hot end conducting plate; a high-temperature difference monomer is connected below each hot-end electrode cap; the middle-temperature difference monomers of corresponding types are connected below the high-temperature difference monomers respectively; and a cold end electrode cap is connected below each medium temperature difference monomer, and a cold end conducting strip is arranged below each cold end electrode cap. The power generation unit has the use temperature of 800-1000 ℃, the working temperature difference exceeds 700K, and domestic self-produced reactors can be used as heat sources.
Description
Technical Field
The invention belongs to the technical field of thermoelectric power generation, and particularly relates to a high-energy-conversion-efficiency cascade thermoelectric power generation unit.
Background
The thermoelectric generation technology is an energy conversion technology which directly converts heat energy into electric energy by utilizing the Seebeck effect of a thermoelectric material. The thermoelectric power generation device developed by the technology has the advantages of compact structure, no moving parts, environmental protection, long service life, capability of enduring severe environment and the like, and has wide application prospect in the fields of moon/deep space exploration, unattended frontier defense/polar region safety protection, medical science and the like. The thermoelectric energy conversion efficiency of the conventional thermoelectric power generation technology is low (about 3% -8%), which directly limits the further wide popularization and application of the thermoelectric power generation technology.
For a certain thermoelectric material, the performance merit Z has a peak value only at a certain temperature. The cascade technology opens up a brand new way for improving the thermoelectric conversion efficiency of the thermoelectric power generation technology: the thermoelectric materials are constructed into cascade monomers, each component material works in the self optimal temperature zone, the thermoelectric materials have larger Z value in the whole working temperature range, and the manufactured thermoelectric device achieves higher efficiency on the whole. According to the published technical literature data, the current cascade power generation unit mostly selects a medium-temperature PbTe/CoSb material to match with a low-temperature BiTe material, the working temperature is 750K to 770K, and the working temperature difference is about 450K to 470K. For application, the heat source (Pu-238) used by the heat source has no domestic production capacity, so that the application is limited; as for the device itself, the high temperature region (773K-1100K) is not utilized at all, the working temperature difference is not ideal, and the performance has a space for continuously rising.
Disclosure of Invention
The invention provides a novel combined cascade power generation unit with high energy conversion efficiency by starting from the material selection of the cascade power generation unit. The power generation unit has the use temperature of 800-1000 ℃, the working temperature difference exceeds 700K, and domestic self-produced reactors can be used as heat sources.
In order to achieve the purpose, the invention adopts the following technical scheme:
a high-energy-conversion-efficiency cascade thermoelectric power generation unit comprises a hot end electrode, a P/N type high-temperature thermoelectric unit, a P/N type medium-temperature thermoelectric unit and a cold end electrode which are sequentially arranged from top to bottom according to the working temperature of each stage of unit; the hot end electrode and the cold end electrode are both in a boot shape, and both the electrodes are formed by brazing and connecting a conducting strip and an electrode cap; a hot end electrode cap is respectively arranged at the two ends below the hot end conducting plate; a high-temperature difference monomer is connected below each hot-end electrode cap; the middle-temperature difference monomers of corresponding types are connected below the high-temperature difference monomers respectively; and a cold end electrode cap is connected below each medium-temperature difference monomer, and a cold end conducting strip is respectively arranged below each cold end electrode cap.
Furthermore, in the two high-temperature thermoelectric monomers, the P-type monomer material is phosphorus (P) -doped Boron Nitride (BN) nano composite N-type Si x Ge 1-x X is 0.9-0.95; the N-type monomer material is boron (B) doped Boron Nitride (BN) nano composite P-type Si y Ge 1-y Y is 0.75-0.85, and the high temperature (800-1000 ℃ C.) of the power generation unit is realized) And (6) working.
Further, the N-type intermediate-temperature thermoelectric monomer is made of halogen-doped N-type PbTe; the P-type intermediate temperature thermoelectric monomer is selected from P-type (GeTe) a (AgSbTe 2 ) 1-a And a is 0.8-0.9, and the working temperature difference can be effectively increased by cascading high-temperature and medium-temperature monomers.
Further, the conducting sheet material is any one of Ni group metal, mo, ti and red copper, and the metal has stable chemical property and good heat conductivity.
Further, the electrode cap is a cylindrical sheet body made of 304 stainless steel, the thickness of the electrode cap is 1.5-2.5 mm, and the design of the electrode cap is favorable for improving the integration quality of the cold end face and the hot end face.
Furthermore, the conducting plate is flat, two ends of the flat along the length direction are provided with semi-arcs with the same diameter as the electrode caps, and the thickness of the conducting plate is 1 mm-3 mm.
Furthermore, the high and medium temperature thermoelectric monomers are cylinders with the same diameter as the electrode cap, and the diameter is 5-6.5 mm; wherein the height of the high-temperature thermoelectric monomer is 5 cm-8 cm, and the height of the medium-temperature thermoelectric monomer is 7 cm-9 cm.
Furthermore, the hot end and the high-temperature thermoelectric monomer are integrated in a compression joint mode, the pressure is 3 MPa-5 MPa, and the interface contact resistance can be reduced under proper pressure on the premise of ensuring that the element is not damaged;
the medium-temperature thermoelectric monomer and the cold end are integrated by brazing, the brazing temperature does not exceed 200 ℃, and the process meets the requirement of the cold end temperature.
Furthermore, diffusion layer materials are respectively prepared on the end faces of the high-temperature and medium-temperature thermoelectric monomers which are contacted with each other, and are integrated in a brazing mode, so that the low-temperature welding high-temperature use is realized, and the performance attenuation caused by repeated high-temperature impact of elements is avoided.
Furthermore, any one of Au, ag and Pb metal foils is arranged in the hot-end electrode cap, so that hard contact among different interfaces is avoided, and better interface bonding is realized.
The invention has the advantages and positive effects that:
the invention provides a novel SiGe (high temperature) -PbTe (medium temperature) -TAGS (medium temperature) combined cascade power generation unit with high energy conversion efficiency starting from the selection of materials for forming the cascade power generation unit. The power generation unit has the use temperature of 800-1000 ℃, the working temperature difference exceeds 700K, and domestic self-produced reactors can be used as heat sources. The invention firstly provides the design and development of the high-temperature-medium-temperature cascade power generation unit, breaks through the limitation of an application heat source, and can greatly improve the working temperature difference and the energy conversion efficiency of the power generation unit.
Description of the drawings:
FIG. 1 is a perspective view of a high transduction efficiency cascaded thermoelectric generation unit in accordance with a preferred embodiment of the present invention.
Wherein: 1. a hot side electrode; 11. a hot end conductive sheet; 12. a hot end electrode cap; 2. a high temperature thermoelectric cell; 3. a medium-temperature thermoelectric monomer; 4. a cold end electrode; 41. a cold end electrode cap; 42. and (4) conducting strips at the cold ends.
Detailed Description
The drawings in the embodiments of the invention will be combined; the technical scheme in the embodiment of the invention is clearly and completely described; obviously; the described embodiments are only some of the embodiments of the invention; rather than all embodiments. Based on the embodiments of the invention; all other embodiments obtained by a person skilled in the art without making any inventive step; all fall within the scope of protection of the present invention.
Example 1
As shown in fig. 1, the embodiment discloses a high-transduction-efficiency cascaded thermoelectric generation unit, which includes, according to the working temperature of each stage of unit, a hot-end electrode 1, a P/N type high-temperature thermoelectric unit 2, a P/N type medium-temperature thermoelectric unit 3, and a cold-end electrode 4, which are sequentially disposed from top to bottom; wherein: the hot end electrode 1 and the cold end electrode 4 are both in a boot shape; both the two electrodes are connected by a conducting strip and an electrode cap through high-temperature brazing; specifically, two hot end electrode caps 12 are respectively arranged at two lower ends of the hot end conducting sheet 11; a high-temperature difference monomer 2 is connected below each hot-end electrode cap 12; the middle-temperature difference monomers 3 of corresponding types are respectively connected below the high-temperature difference monomers 2; a cold end electrode cap 41 is connected below each medium temperature difference monomer 3, and a cold end conducting strip 42 is respectively arranged below the cold end electrode cap 41.
Preferably, in the two high-temperature thermoelectric monomers 2, one monomer material is phosphorus-doped Boron Nitride (BN) nano composite N-type SixGe1-x, x is 0.95, and the other monomer material is boron-doped boron nitride nano composite P-type SiyGe1-y, y is 0.85; the SiGe-PbTe-TAGs power generation unit is preferred in the embodiment; specifically, the P-type high temperature thermoelectric cell is made of P-SiGe material, and the N-type high temperature thermoelectric cell is made of N-SiGe material.
Preferably, in the two intermediate-temperature thermoelectric monomers 3, one monomer material is halogen-doped PbTe, the other monomer material is (GeTe) a (AgSbTe 2) 1-a, and a is 0.75; specifically, the P-type intermediate-temperature thermoelectric cell of the present embodiment is disposed below the P-type high-temperature thermoelectric cell, and is made of TAGs; the N-type medium-temperature thermoelectric monomer is arranged below the N-type high-temperature thermoelectric monomer and is made of N-PbTe material.
Preferably, the conductive sheet material is any one of Ni group metal, mo, ti, and red copper is preferred in this embodiment; the electrode cap is a cylindrical sheet body made of 304 stainless steel, and the thickness of the electrode cap is 1.5 mm-2.5 mm, preferably 1.5mm; the conducting plate is flat, two ends of the flat along the length direction are provided with semicircular arcs with the same diameter as the electrode caps, and the thickness of the conducting plate is 1-3 mm; preferably 2mm; the electrode cap and the conducting strip are brazed and integrated by using solder SnTe.
Preferably, the high and medium temperature thermoelectric monomers are cylinders with the same diameter as the electrode cap, the diameter is 5 mm-6.5 mm, and 6mm is preferred in the embodiment; wherein: the height of the high-temperature thermoelectric monomer 2 is 5 cm-8 cm, and 6.5cm is preferred in the embodiment; the height of the medium-temperature thermoelectric monomer 3 is 7 cm-9 cm, and 8cm is preferred in the embodiment;
preferably, the hot end electrode 1 and the high-temperature thermoelectric monomer 2 are integrated in a compression joint mode, and the pressure is 3MPa to 5MPa, preferably 4MPa;
preferably, any one of metal foils such as Au, ag, pb, etc. is placed in the hot-end electrode cap 12, and an aluminum foil is preferably used in this embodiment;
preferably, diffusion layer materials are respectively prepared on the end faces of the high-temperature and medium-temperature thermoelectric monomers which are contacted with each other, and are integrated in an interface diffusion mode; preferably brazing in an interface diffusion mode; the brazing temperature is not higher than 200 ℃; the using temperature of the diffusion layer is up to 600 ℃; in this embodiment, the high-temperature thermoelectric monomer interface diffusion layer is Ti-Cu, the medium-temperature thermoelectric monomer interface diffusion layer is Mo-In, the diffusion temperatures are all 185 ℃, and the test interface temperature is 494.3 ℃.
Preferably, the medium-temperature thermoelectric monomer 3 and the cold-end electrode 4 are integrated by brazing, the brazing filler metal and the brazing temperature are determined according to the cold-end temperature, and the preferred brazing filler metal in the embodiment is Bi x Sn 1-x The brazing integration temperature does not exceed 200 c, preferably 190 c.
The power generation unit of the embodiment is subjected to electrical performance test, the hot surface is tested at 805.4 ℃, the thermoelectric conversion efficiency reaches 12.38% under 723.6K working temperature difference, and compared with the thermoelectric conversion efficiency of 3% -8% in the conventional thermoelectric power generation technology, the thermoelectric conversion efficiency can be realized to the maximum extent.
The embodiments of the present invention have been described in detail, but the description is only for the preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (7)
1. The utility model provides a high energy conversion efficiency cascades thermoelectric generation unit which characterized in that: according to the working temperature of each stage of monomer, the device comprises a hot end electrode, a P/N type high-temperature thermoelectric monomer, a P/N type medium-temperature thermoelectric monomer and a cold end electrode which are sequentially arranged from top to bottom; the hot end electrode and the cold end electrode are both in a boot shape, and both the electrodes are formed by brazing and connecting a conducting strip and an electrode cap; a hot end electrode cap is respectively arranged at the two ends below the hot end conducting plate; a high-temperature difference monomer is connected below each hot-end electrode cap; the middle-temperature difference monomers of corresponding types are connected below the high-temperature difference monomers respectively; a cold end electrode cap is connected below each medium temperature difference monomer, and a cold end conducting strip is arranged below each cold end electrode cap;
in the two high-temperature thermoelectric monomers, the P-type monomer material is phosphorus (P) -doped Boron Nitride (BN) -nano composite N-type Si x Ge 1-x X is 0.9-0.95; n-type single materialThe material is boron (B) doped Boron Nitride (BN) nano composite P type Si y Ge 1-y Y is 0.75 to 0.85;
the N-type intermediate-temperature thermoelectric monomer is made of halogen-doped N-type PbTe; the P-type intermediate temperature thermoelectric monomer is selected from P-type (GeTe) a (AgSbTe 2 ) 1-a A, taking 0.8 to 0.9; high temperature and medium temperature monomer cascade;
the conducting sheet material is any one of Ni group metal, mo, ti and red copper.
2. The high transduction efficiency cascaded thermoelectric power generation unit of claim 1, wherein: the electrode cap is a cylindrical sheet made of 304 stainless steel, and the thickness of the electrode cap ranges from 1.5mm to 2.5mm.
3. The high transduction efficiency cascaded thermoelectric power generation unit of claim 2, wherein: the conducting strip is flat, semicircular arcs with the same diameter as the electrode caps are arranged at two ends of the flat along the length direction, and the thickness of the conducting strip is 1mm-3mm.
4. The high transduction efficiency cascaded thermoelectric power generation unit of claim 2, wherein: the high and medium temperature thermoelectric monomers are cylinders with the same diameter as the electrode cap, and the diameter is 5mm to 6.5mm; wherein the height of the high-temperature thermoelectric monomer is 5cm to 8cm, and the height of the medium-temperature thermoelectric monomer is 7cm to 9cm.
5. The high transduction efficiency cascaded thermoelectric power generation unit of claim 1, wherein: the hot end and the high-temperature thermoelectric monomer are integrated in a compression joint mode, and the pressure ranges from 3MPa to 5MPa; the medium-temperature thermoelectric monomer and the cold end are integrated by brazing, and the brazing temperature does not exceed 200 ℃.
6. The high transduction efficiency cascaded thermoelectric power generation unit of claim 1, wherein: diffusion layer materials are respectively prepared on the end surfaces of the high-temperature and medium-temperature thermoelectric monomers which are contacted with each other, and the diffusion layer materials are integrated by adopting a brazing mode.
7. The high transduction efficiency cascaded thermoelectric power generation unit of claim 1, wherein: any one of Au, ag and Pb metal foils is arranged in the hot end electrode cap.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911406029.9A CN111064391B (en) | 2019-12-31 | 2019-12-31 | High-energy-conversion-efficiency cascade thermoelectric power generation unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911406029.9A CN111064391B (en) | 2019-12-31 | 2019-12-31 | High-energy-conversion-efficiency cascade thermoelectric power generation unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111064391A CN111064391A (en) | 2020-04-24 |
| CN111064391B true CN111064391B (en) | 2022-12-13 |
Family
ID=70305263
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911406029.9A Active CN111064391B (en) | 2019-12-31 | 2019-12-31 | High-energy-conversion-efficiency cascade thermoelectric power generation unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111064391B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1601778A (en) * | 2004-10-25 | 2005-03-30 | 天津大学 | Mfg method microfilm thermoelectric cell |
| JP2011134940A (en) * | 2009-12-25 | 2011-07-07 | Kyocera Corp | Thermoelectric conversion element, and thermoelectric conversion module and thermoelectric conversion device employing the same |
| CN103022337A (en) * | 2012-12-27 | 2013-04-03 | 中国电子科技集团公司第十八研究所 | Structural gradient cascaded thermoelectric power generation device |
| CN103560203A (en) * | 2013-10-23 | 2014-02-05 | 合肥工业大学 | Simple and efficient film thermobattery structure and manufacturing method thereof |
| CN104993740A (en) * | 2015-07-07 | 2015-10-21 | 天津大学 | Segmental thermoelectric generator structure design method |
| CN107681044A (en) * | 2017-10-16 | 2018-02-09 | 中国科学院上海硅酸盐研究所 | A kind of wide temperature range Thermoelectric Generator of multi-segment structure and preparation method |
| CN110243104A (en) * | 2019-05-17 | 2019-09-17 | 华中科技大学 | A kind of semiconductor chilling plate of segmentation structure |
-
2019
- 2019-12-31 CN CN201911406029.9A patent/CN111064391B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1601778A (en) * | 2004-10-25 | 2005-03-30 | 天津大学 | Mfg method microfilm thermoelectric cell |
| JP2011134940A (en) * | 2009-12-25 | 2011-07-07 | Kyocera Corp | Thermoelectric conversion element, and thermoelectric conversion module and thermoelectric conversion device employing the same |
| CN103022337A (en) * | 2012-12-27 | 2013-04-03 | 中国电子科技集团公司第十八研究所 | Structural gradient cascaded thermoelectric power generation device |
| CN103560203A (en) * | 2013-10-23 | 2014-02-05 | 合肥工业大学 | Simple and efficient film thermobattery structure and manufacturing method thereof |
| CN104993740A (en) * | 2015-07-07 | 2015-10-21 | 天津大学 | Segmental thermoelectric generator structure design method |
| CN107681044A (en) * | 2017-10-16 | 2018-02-09 | 中国科学院上海硅酸盐研究所 | A kind of wide temperature range Thermoelectric Generator of multi-segment structure and preparation method |
| CN110243104A (en) * | 2019-05-17 | 2019-09-17 | 华中科技大学 | A kind of semiconductor chilling plate of segmentation structure |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111064391A (en) | 2020-04-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100508232C (en) | Thermoelectric conversion element | |
| US20090133734A1 (en) | Thermoelectric Conversion Module | |
| US20100326487A1 (en) | Thermoelectric element and thermoelectric device | |
| US7985918B2 (en) | Thermoelectric module | |
| JPH1074986A (en) | Production of thermoelectric conversion element, pi-type thermoelectric conversion element pair and thermoelectric conversion module | |
| CN103022337A (en) | Structural gradient cascaded thermoelectric power generation device | |
| CN106159077B (en) | Bismuth telluride-based thermoelectric power generation element and preparation method thereof | |
| CN111064391B (en) | High-energy-conversion-efficiency cascade thermoelectric power generation unit | |
| KR102022429B1 (en) | Cooling thermoelectric moudule and method of manufacturing method of the same | |
| CN104779340A (en) | Temperature-difference power generating device based on high-conductivity graphene connection material | |
| CN204464322U (en) | A kind of temperature difference electricity generation device of leading Graphene connecting material based on height | |
| JP2004273489A (en) | Thermoelectric conversion module and its manufacturing method | |
| WO2017020833A1 (en) | Phase change inhibited heat-transfer thermoelectric power generation device and manufacturing method thereof | |
| CN103022338B (en) | Manufacturing method of cascade temperature-difference power generating device | |
| JP2006319119A (en) | Thermoelectric module | |
| CN110976863B (en) | Application of chromium-nickel austenitic stainless steel alloy in thermoelectric material electrode and Mg3Sb2Thermoelectric connector | |
| CN208225913U (en) | Flexible thermo-electric device | |
| RU2628676C1 (en) | Thermoelectric element | |
| CN205123620U (en) | Phase transition restraines heat transfer thermoelectric generator spare | |
| CN110649149B (en) | Offset semiconductor thermoelectric module adopting thermoelectric arms with hexahedral structure | |
| CN208690302U (en) | A kind of organic/inorganic composite material thermoelectric generating device | |
| JP5855876B2 (en) | Power generation system | |
| US20150083181A1 (en) | Thermoelectric generator and production method for thermoelectric generator | |
| GB2469449A (en) | Connecting Structure for exteriorly connecting battery cells | |
| CN108417705A (en) | A kind of organic/inorganic composite material thermoelectric generating device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |