JP5100305B2 - Thermal-electrical direct conversion device - Google Patents

Description

  The present invention relates to a technique for converting thermal energy due to a temperature difference using a thermoelectric module into electrical energy.

  In recent years, the energy consumption of mankind has accelerated unprecedentedly with the development of industry and science and technology. As a result, the problem of global warming due to greenhouse gases such as CO2 has emerged. In order to suppress the generation of greenhouse gases as much as possible, high-temperature thermal energy that is currently being discarded from internal combustion engines such as automobiles, as well as various industries such as gas incinerators and thermal power plants, is used as much as possible. It is expected to commercialize power generation equipment that converts it into electrical energy and recovers it.

  As a power generation apparatus that recovers thermal energy as electric energy, a power generation technique using a thermoelectric power generation element is well known. This thermoelectric power generation element utilizes the Seebeck effect in which a temperature difference is given to both ends of a metal or a semiconductor, and a potential difference is generated between a high temperature part and a low temperature part. The thermoelectric power generation element is characterized in that the amount of power generation increases as the temperature difference increases. Usually, a plurality of thermoelectric power generation elements are integrated and used in the form of a thermoelectric module. Further, as disclosed in Patent Document 1, a configuration is disclosed in which a component member is surrounded by an airtight casing for the purpose of preventing oxidation of the component member and the like so that the thermoelectric module can be used for a long period of time.

Conventionally, when such a thermoelectric module is used as a direct thermal-electric conversion device, the contact thermal resistance at the interface between the thermoelectric module and the low temperature member is reduced so as not to impair the heat removal capability of the low temperature member. For this purpose, in general, attempts have been made to apply grease by applying grease having a thermal conductivity of several W / (m · K), which is relatively larger than the thermal conductivity of air.
JP 2006-32723 A

  However, in order to bring the thermoelectric module disclosed in Patent Document 1 into contact with the low-temperature member, as described above, it is necessary to apply thermal conductive grease to the interface between the low-temperature member and the thermoelectric module. In this case, in addition to the difficulty of uniformly applying the grease, there is a problem that heat transfer characteristics are deteriorated when air is mixed into the grease during application.

  In addition, when the electrical insulation of the thermal conductive grease is insufficient, when moisture is absorbed, or when foreign matter is mixed in, there is a problem that an electrical short circuit or leakage occurs due to contact with the output terminal of the thermoelectric module. Furthermore, the heat conductive grease has a large viscosity, and there is a problem that it is difficult to ensure workability and cleanliness when installing a low temperature member in the thermoelectric module.

  In addition, when maintenance work such as removing, cleaning, and re-applying grease for replacing thermoelectric modules is performed, if removal or cleaning is insufficient, or if foreign matter such as dust or dust enters during removal, uniform re-application of the grease will occur. There are problems that it becomes difficult and heat transfer characteristics are deteriorated by air mixing and foreign matters.

  Furthermore, in maintenance work such as grease removal / cleaning and recoating, there is a problem that foreign matter such as dust or dust is mixed in or when moisture is absorbed, causing electrical short circuit or electric leakage. .

  The present invention has been made in view of such articles, and can achieve efficient conversion from thermal energy to electrical energy, obtain a high-performance power generation function, and improve workability such as installation and maintenance. Another object of the present invention is to provide an excellent direct thermal-electric conversion device.

  The direct thermal-electric conversion device according to the present invention includes a thermoelectric module incorporating a thermoelectric conversion element that converts thermal energy into electrical energy, a low-temperature member that cools the thermoelectric module, and between the thermoelectric module and the low-temperature member. And an electrically insulating heat conducting member having thermal conductivity and electrical insulation.

  According to the present invention, by installing a material having thermal conductivity and a material having electrical insulation between the thermoelectric module and the low temperature member, the thermoelectric module is prevented from being electrically short-circuited, and from the upper surface of the thermoelectric module. The hindrance to discharge to the low temperature member can also be suppressed. In addition, by making the rigidity of the material having thermal conductivity and the material having electrical insulation smaller than the rigidity of the thermoelectric module and the rigidity of the low temperature member, the material having thermal conductivity and the material having electrical insulation are Since it deforms according to the unevenness of the solid surface at the contact interface between the thermoelectric module and the low temperature member, no void is formed.

  Hereinafter, embodiments of a thermoelectric generator according to the present invention will be described with reference to the drawings. 1 to 3 show the first embodiment. FIG. 1 is a bird's-eye view showing a direct thermal-electric conversion device according to the first embodiment of the present invention. FIG. 2 is an XX longitudinal sectional view of the direct thermal-electric conversion device shown in FIG. FIG. 3 is an enlarged schematic diagram in the case where the thermoelectric module and the low temperature member portion are in direct contact.

  As shown in FIGS. 1 and 2, the thermoelectric direct conversion device 1 is composed of a thermoelectric module 2, a low temperature member 3, a heat conducting member 4 installed between them, and an electric insulating member 5. Yes. The thermoelectric module 2 is configured by surrounding a plurality of thermoelectric power generation elements with an airtight housing. A contact interface 6 between the thermoelectric module 2 and the electrical insulating member 5 exists between the thermoelectric module 2 and the electrical insulating member 5. Further, a contact interface 7 between the electrical insulation member 5 and the heat conduction member 4 exists between the electrical insulation member 5 and the heat conduction member 4. Further, a contact interface 8 between the heat conducting member 4 and the low temperature member 3 exists between the heat conducting member 4 and the low temperature member 3.

  When the upper surface (opposite surface of the contact interface 6) of the thermoelectric module 2 shown in FIG. 1 is heated by the high temperature and the heat flows to the low temperature member, holes and electrons flow in the thermoelectric power generation elements constituting the thermoelectric module 2, Electric power is generated.

  Here, as shown in FIG. 3, a case where the electrical insulating member 5 and the thermal insulating member 4 are not installed between the thermoelectric module 2 and the low temperature member 3 will be described. In this case, the contact interface between the thermoelectric module 2 and the low temperature member 3 is solid-solid contact. The contact surfaces of the thermoelectric module 2 and the low temperature member 3 are not flat when viewed macroscopically, and have irregularities. Therefore, the contact portion 9 between the thermoelectric module 2 and the low temperature member 3 can hold only a very small contact area. Therefore, as shown in FIG. 3, many gaps 10 exist at the contact interface between the thermoelectric module 2 and the low temperature member 3. Compared with the case where the contact between the thermoelectric module 2 and the low temperature member 3 is a surface contact where the air gap 10 does not exist, the gas is confined in the air gap 10 existing at the contact interface between the thermoelectric module 2 and the low temperature member 3. The thermal conductivity of the high-temperature heat in which the upper surface of the thermoelectric module 2 is heated by the heat conduction of the gas inside the gap 10 flows to the low-temperature member 3 decreases. Further, the heat transfer by radiation becomes more dominant as the degree of vacuum inside the gap 10 existing at the contact interface between the thermoelectric module 2 and the low temperature member 3 increases. Therefore, macroscopically, the thermal conductivity through which the high-temperature heat heated on the upper surface of the thermoelectric module 2 flows to the low-temperature member 3 is greatly reduced.

  In the first embodiment, as shown in FIGS. 1 and 2, a heat conducting member 4 and an electrical insulating member 5 are installed between the thermoelectric module 2 and the low temperature member 3. The heat conductive member 4 is made of a material having the smallest rigidity among the thermoelectric module 2, the electric insulating member 5, the heat conductive member 4, and the low temperature member 3 constituting the heat-electric direct conversion device 1. Or when the thermoelectric direct conversion apparatus 1 uses other members other than the thermoelectric module 2, the electric insulation member 5, the heat conduction member 4, and the low temperature member 3, the heat conduction member 4 is all heat-electricity. A material having the smallest rigidity among the constituent members of the direct conversion device 1 may be used. By installing the heat conducting member 4, the heat conducting member 4 is deformed at the contact interface 8 between the heat conducting member 4 and the low temperature member 3 according to the unevenness of the solid surface of the low temperature member 3. As a result, the contact interface 8 between the heat conducting member 4 and the low temperature member 3 does not have a gap, so that a decrease in thermal conductivity from the upper surface of the thermoelectric module 2 to the low temperature member 3 can be suppressed.

  The electrical insulating member 5 is installed so as to be in contact with the thermoelectric module 2 in order to prevent an electrical short circuit and leakage due to the thermoelectric module 2 generating power. In addition, two output terminals may be provided on the surface of the thermoelectric module 2 facing the low temperature member 3 (contact interface between the thermoelectric module 2 and the electrical insulating member 5) as an output end of electric power generated by the thermoelectric module 2. is there. Since the low temperature member 3 is metallic, by installing the electric insulation member 5 between the thermoelectric module 2 and the low temperature member 3, the output terminal contacts the electric insulation heat member 5, and the electric insulation of the electric insulation heat member 5. Insulation can ensure electrical insulation between the output terminals.

  The electrical insulating member 5 is made of a material having a lower rigidity than the thermoelectric module 2, the low temperature member 3, and other members constituting the thermo-electric direct conversion device 1, similarly to the heat conducting member 4 described above. Alternatively, the electrical insulating member 5 may be a material having the smallest rigidity among the thermoelectric module 2, the electrical insulating member 5, the heat conducting member 4, and the low temperature member 3 constituting the thermal-electrical direct conversion device 1. Or when the thermoelectric direct conversion apparatus 1 uses other members other than the thermoelectric module 2, the electric insulating member 5, the heat conducting member 4, and the low temperature member 3, the electric insulating member 5 is all of the heat-electricity. A material having the smallest rigidity among the constituent members of the direct conversion device 1 may be used. Alternatively, the electrical insulating member 5 may be made of a material having rigidity smaller than that of the thermoelectric module 2, the low temperature member 3, and other members and having the same rigidity as the heat conducting member 4.

  In this case, by installing the electrical insulating member 5, the electrical insulating member 5 is deformed at the contact interface 6 between the electrical insulating member 5 and the thermoelectric module 2 according to the unevenness of the solid surface of the thermoelectric module 2. As a result, since no gap is formed in the contact interface 6 between the electrical insulating member 5 and the thermoelectric module 2, a decrease in thermal conductivity from the upper surface of the thermoelectric module 2 to the low temperature member 3 can be suppressed.

  That is, the rigidity of the electrical insulating member 5 and the rigidity of at least one of the heat conducting members 4 need only be smaller than the rigidity of the thermoelectric module 2, the rigidity of the low temperature member 3, and the rigidity of other members. Further, if both the rigidity of the electric insulating member 5 and the rigidity of the heat conducting member 4 are smaller than the rigidity of the thermoelectric module 2, the rigidity of the low temperature member 3, and the rigidity of other members, the low temperature member is further removed from the upper surface of the thermoelectric module 2. Decrease in thermal conductivity to 3 can be suppressed. In this case, the rigidity of the electrical insulating member 5 may be the same as or different from the rigidity of the heat conducting member 4.

  In the present embodiment, the thickness of any one or more of the heat conducting member 4 and the electric insulating member 5 is determined by the thermoelectric module 2, the electric insulating member 5, the heat conducting member 4, and the heat-electric direct conversion device 1. It is the thinnest of the low temperature members 3. Alternatively, in the case where the thermo-electric direct conversion device 1 uses other members other than the thermoelectric module 2, the electric insulating member 5, the heat conducting member 4, and the low temperature member 3, any of the heat conducting member 4 and the electric insulating member 5 is used. One or more thicknesses may be the thinnest of all the components of the direct thermoelectric conversion device 1. As a result, even if the thermal conductivity of the heat conducting member 4 and the electrical insulating member 5 is relatively small, the thickness of the electrical insulating member 5 and the heat conducting member 4 can be reduced to reduce the thickness of the heat conducting member 4 and the electrical conducting member 4. A decrease in thermal conductivity due to the insulating member 5 can be suppressed.

  Further, in this embodiment, the thermal conductivity of the heat conducting member 4 installed between the thermoelectric module 2 and the low temperature member 3 is the same as that of the grease applied conventionally between the thermoelectric module 2 and the low temperature member 3. The case where it is smaller than the rate will be described. In this case, the heat conductivity by the heat conductive member 4 can be improved by making the heat conductive member 4 into a material containing a metal. The metal included in the heat conductive member 4 may be fine metal particles, fine metal wires, metal mesh wires, metal foil, foam metal, sintered metal, or at least two of them.

  Moreover, the relationship of the area of the contact interface 6 between the thermoelectric module 2 and the electrical insulation member 5, the contact interface 7 between the electrical insulation member 5 and the heat conduction member 4, and the contact interface 8 between the heat conduction member 4 and the low temperature member 3. Will be described. The electric insulating member 5 and the heat conducting member 4 having the following sizes can be installed so that heat can efficiently flow from the upper surface of the thermoelectric module 2 to the low temperature member 3. That is, by increasing the area of the contact interface 8 between the heat conducting member 4 and the low temperature member 3 from the area of the contact interface 6 between the thermoelectric module 2 and the electrical insulating member 5, the upper surface of the thermoelectric module 2 is moved to the low temperature member 3. The heat dissipation may be made efficient. For example, the contact area between the thermoelectric module 2 and the electrical insulation member 5 is A, the contact area between the electrical insulation member 5 and the heat conduction member 4 is B, and the contact area between the heat conduction member 4 and the low temperature member 3 is C. At this time, C ≧ A and C ≧ B may be satisfied.

  In the first embodiment, the electrical insulating member 5 and the heat conducting member 4 have been described with respect to the case where the electric insulating member 5 and the heat conducting member 4 are installed between the thermoelectric module 2 and the low temperature member 3. An electrically insulating heat conducting member made of one material having insulating properties and heat conducting properties may be used. This example will be described as a second embodiment.

  4 (a) and 4 (b) are diagrams for explaining a thermal-electrical direct conversion device according to a second embodiment. Fig.4 (a) is a longitudinal cross-sectional view which shows the thermoelectric direct conversion apparatus 1 by the 2nd Embodiment of this invention. FIG. 4B is a bottom view of the thermoelectric module 2 when the thermoelectric module 2 is viewed from below in the YY plane shown in FIG.

  As shown in FIG. 4A, between the thermoelectric module 2 and the low temperature member 3, an electrically insulating material is used for the heat conducting member 4 of the first embodiment shown in FIG. An electrically insulating heat conducting member 11 in which the conducting member 4 and the electrically insulating member 5 are made of the same material is provided. As shown in FIG. 4 (b), the surface of the thermoelectric module 2 facing the low temperature member 3 (the contact interface between the thermoelectric module 2 and the electrically insulating heat conducting member 11) serves as an output terminal for the electric power generated by the thermoelectric module 2. Two terminals 12 are provided. Since the low temperature member 3 is made of metal, by installing the electrically insulating heat conducting member 11 between the thermoelectric module 2 and the low temperature member 3, the terminal 12 comes into contact with the electrically insulating heat conducting member 11, and the electrically insulating heat conducting member The electrical insulation between the terminals 12 can be ensured by the electrical insulation of 11. Moreover, since the electrically insulating heat conductive member 11 has thermal conductivity, it is possible to suppress a decrease in thermal conductivity from the upper surface of the thermoelectric module 2 to the low temperature member 3. From the above, even if the terminal 12 is provided on the surface facing the low temperature member 3 of the thermoelectric module 2, the electrical insulating heat conducting member 11 is installed, so that both electrical insulation and thermal conductivity can be ensured.

  The electrically insulating heat conducting member 11 is made of a material having the smallest rigidity among the thermoelectric module 2, the electrically insulating heat conducting member 11, and the low temperature member 3 constituting the heat-electrical direct conversion device 1. Alternatively, when the thermo-electrical direct conversion device 1 uses other members other than the thermoelectric module 2, the electrically insulating heat conducting member 11, and the low temperature member 3, the electrically insulating heat conducting member 11 is all of the thermoelectric direct A material having the smallest rigidity among the constituent members of the conversion device 1 may be used. By installing the electrically insulating heat conducting member 11, the electrically insulating heat conducting member 11 becomes a contact interface between the electrically insulated heat conducting member 11 and the thermoelectric module 2 and a contact interface between the electrically insulated heat conducting member 11 and the low temperature member 3. The thermoelectric module 2 and the low temperature member 3 are deformed according to the unevenness of the solid surface. As a result, there is no gap at the contact interface between the electrically insulating heat conducting member 11 and the thermoelectric module 2 and at the contact interface between the electrically insulating heat conducting member 11 and the low temperature member 3. Therefore, a decrease in thermal conductivity from the upper surface of the thermoelectric module 2 to the low temperature member 3 can be suppressed.

  In this embodiment, the thickness of the electrically insulating heat conducting member 11 is the thinnest among the thermoelectric module 2, the electrically insulating heat conducting member 11, and the low temperature member 3 constituting the thermo-electric direct conversion device 1. Alternatively, when the thermo-electrical direct conversion device 1 uses other members other than the thermoelectric module 2, the electrically insulating heat conducting member 11, and the low temperature member 3, the electrically insulating heat conducting member 11 is all of the thermoelectric direct You may make it the thinnest in the structural member of the converter 1. FIG. Thereby, even if the heat conductivity of the electrically insulating heat conducting member 11 is relatively small, the thermal conductivity is lowered by the electrically insulating heat conducting member 11 by reducing the thickness of the electrically insulating heat conducting member 11. Can be suppressed.

  The relationship between the contact interface between the thermoelectric module 2 and the electrically insulating heat conducting member 11 and the area of the contact interface between the electrically insulating heat conducting member 11 and the low temperature member 3 will be described. In order to efficiently flow heat from the upper surface of the thermoelectric module 2 to the low-temperature member 3, an electrically insulating heat conducting member 11 having the following size can be installed. That is, by increasing the area of the contact interface between the electrically insulating heat conducting member 11 and the low temperature member 3 from the area of the contact interface between the thermoelectric module 2 and the electrically insulating heat conducting member 11, the low temperature member is removed from the upper surface of the thermoelectric module 2. The heat radiation to 3 may be made efficient. For example, the contact area between the thermoelectric module 2 and the electrically insulating heat conducting member 11 is D, and the contact area between the electrically insulating heat conducting member 11 and the low temperature member 3 is E. At this time, E ≧ D may be satisfied.

  FIGS. 5A and 5B are diagrams for explaining a thermal-electrical direct conversion device according to a third embodiment. Fig.5 (a) is a longitudinal cross-sectional view which shows the thermoelectric direct conversion apparatus 1 by the 2nd Embodiment of this invention. FIG.5 (b) is the bottom view of the thermoelectric module 2 which looked at the thermoelectric module 2 from the downward direction in the ZZ surface shown to Fig.5 (a).

  As shown in FIG. 5A, a heat conducting member 13 is installed between the thermoelectric module 2 and the low temperature member 3. Instead of the heat conducting member 13, an electrically insulating heat conducting member may be installed. As shown in FIG. 5 (b), the surface of the thermoelectric module 2 facing the low temperature member 3 (the contact interface between the thermoelectric module 2 and the electrically insulating heat conducting member 11) has an output terminal for the electric power generated by the thermoelectric module 2. Two terminals 12 are provided. And the electrical insulation member 5 is arrange | positioned so that the surface of the terminal 12 may be covered just on the surface of the terminal 12 facing the heat conduction member 13 (or electrical insulation heat conduction member). The low temperature member 3 is made of metal, and the terminal 12 is at a low temperature so as not to cause an electrical short circuit by direct contact or electrical connection with the low temperature member 3 and the heat conduction member 13 (or electrically insulating heat conduction member). The electrical insulating member 5 is disposed at a place where there is a concern that the member 3 may come into contact. Therefore, electrical insulation between the terminals 12 can be ensured.

  Further, the heat conducting member 13 (or the electrically insulating heat conducting member) installed between the thermoelectric module 2 and the low temperature member 3 is the same as the thermoelectric module 2 except for the portion where the electric insulating member 5 covering the terminal 12 is provided. Direct contact can be made without going through the electrical insulating member 5. Since the heat conductive member 13 (or the electrically insulating heat conductive member) has heat conductivity, and the electric insulating member 5 is provided only partially between the thermoelectric module 2 and the low temperature member 3, the thermoelectric module. 2 can suppress a decrease in thermal conductivity from the upper surface of 2 to the low temperature member 3. As mentioned above, even if the terminal 12 is provided in the surface facing the low temperature member 3 of the thermoelectric module 2, both electrical insulation and thermal conductivity can be ensured.

  In the present embodiment, the thickness of the heat conducting member 13 (or the electrically insulating heat conducting member) is determined by the thermoelectric module 2, the heat conducting member 13 (or the electrically insulating heat conducting member) constituting the thermo-electric direct conversion device 1, It is the thinnest of the low temperature members 3. Alternatively, in the case where the thermo-electric direct conversion device 1 uses other members other than the thermoelectric module 2, the heat conducting member 13 (or the electrically insulating heat conducting member), and the low temperature member 3, the heat conducting member 13 (or the electric insulation). The heat conduction member) may be the thinnest among the constituent members of all the thermal-electrical direct conversion devices 1. Thereby, even if the heat conductivity of the heat conducting member 13 (or the electrically insulating heat conducting member) is relatively small, the heat conducting member 13 (or the It is possible to suppress a decrease in thermal conductivity due to the electrically insulating heat conducting member.

  Further, the relationship between the contact interface between the thermoelectric module 2 and the heat conducting member 13 (or electrically insulating heat conducting member) and the area of the contact interface between the heat conducting member 13 (or electrically insulating heat conducting member) and the low temperature member 3 will be described. To do. A heat conducting member 13 (or an electrically insulating heat conducting member) can be installed so that heat efficiently flows from the upper surface of the thermoelectric module 2 to the low temperature member 3. That is, the area of the contact interface between the heat conduction member 13 (or the electrical insulation heat conduction member) and the low temperature member 3 is larger than the area of the contact interface between the thermoelectric module 2 and the heat conduction member 13 (or electrical insulation heat conduction member). By doing so, the heat radiation from the upper surface of the thermoelectric module 2 to the low temperature member 3 may be made efficient. For example, the contact area between the thermoelectric module 2 and the heat conducting member 13 (or electrically insulating heat conducting member) is F, and the contact area between the heat conducting member 13 (or electrically insulating heat conducting member) and the low temperature member 3 is G. At this time, G ≧ F may be satisfied.

  Moreover, when the heat conducting member 13 is used between the thermoelectric module 2 and the low temperature member 3 in the present embodiment, the heat conducting member 13 is made of a material containing a metal, thereby improving the heat conductivity of the heat conducting member 13. Can be made. The metal included in the heat conductive member 13 may be fine metal particles, fine metal wires, metal mesh wires, metal foil, foam metal, sintered metal, or at least two of them.

  Note that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention in the implementation stage. In addition, the embodiments may be appropriately combined as much as possible, and in that case, the combined effect can be obtained. Further, the above embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. For example, even if some constituent requirements are deleted from all the constituent requirements shown in the embodiment, the problem described in the column of the problem to be solved by the invention can be solved, and the effect described in the column of the effect of the invention Can be obtained as an invention.

The bird's-eye view which shows the heat-electricity direct conversion apparatus by 1st Embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS The longitudinal cross-sectional view which shows the thermoelectric direct conversion apparatus by 1st Embodiment of this invention. The expansion schematic diagram of the conventional thermoelectric module and a low-temperature member part. The longitudinal cross-sectional view which shows the thermoelectric direct conversion apparatus by 2nd Embodiment of this invention, and the bottom view of a thermoelectric module. The longitudinal cross-sectional view which shows the thermoelectric direct conversion apparatus by 3rd Embodiment of this invention, and the bottom view of a thermoelectric module.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Thermal-electrical direct conversion apparatus, 2 ... Thermoelectric module, 3 ... Low temperature member, 4 ... Heat conduction member, 5 ... Electrical insulation member, 6 ... Contact interface of a thermoelectric module and an electrical insulation member, 7 ... Electrical insulation member Contact interface with heat conducting member, 8 ... Contact interface between heat conducting member and low temperature member, 9 ... Contact portion, 10 ... Gap between thermoelectric module and low temperature member, 11 ... Electrically insulated heat conducting member, 12 ... Terminal, 13 ... heat conduction member.

Claims (2)

A thermoelectric module incorporating a thermoelectric conversion element that converts thermal energy into electrical energy;
A low temperature member for cooling the thermoelectric module;
A thermally conductive member having thermal conductivity installed between the thermoelectric module and the low temperature member ;
An electrically insulating member having electrical insulation installed between the thermoelectric module and the heat conducting member ;
I have a,
Both the electrical insulating member and the heat conducting member have the smallest rigidity among the members constituting the thermal-electrical direct conversion device,
A direct heat-electric conversion device. 2. The thermo-electric conversion power generator according to claim 1, wherein both of the electric insulating member and the heat conducting member have the smallest thickness among members constituting the heat-electric direct conversion device.

Images