WO2023176581A1 - Module de conversion thermoélectrique - Google Patents

Module de conversion thermoélectrique Download PDF

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Publication number
WO2023176581A1
WO2023176581A1 PCT/JP2023/008518 JP2023008518W WO2023176581A1 WO 2023176581 A1 WO2023176581 A1 WO 2023176581A1 JP 2023008518 W JP2023008518 W JP 2023008518W WO 2023176581 A1 WO2023176581 A1 WO 2023176581A1
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WO
WIPO (PCT)
Prior art keywords
thermoelectric conversion
electrically insulating
radiant heat
heat reflecting
plate
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PCT/JP2023/008518
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English (en)
Japanese (ja)
Inventor
潔 山本
貴博 山本
裕 清水
裕 味村
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古河電気工業株式会社
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Publication of WO2023176581A1 publication Critical patent/WO2023176581A1/fr

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    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N10/00—Thermoelectric devices comprising a junction of dissimilar materials, i.e. devices exhibiting Seebeck or Peltier effects
    • H10N10/10—Thermoelectric devices comprising a junction of dissimilar materials, i.e. devices exhibiting Seebeck or Peltier effects operating with only the Peltier or Seebeck effects
    • H10N10/13—Thermoelectric devices comprising a junction of dissimilar materials, i.e. devices exhibiting Seebeck or Peltier effects operating with only the Peltier or Seebeck effects characterised by the heat-exchanging means at the junction

Definitions

  • the present invention relates to a thermoelectric conversion module having a structure in which a plurality of thermoelectric conversion elements are electrically connected in series alternately.
  • thermoelectric conversion module that utilizes the Seebeck effect can convert thermal energy into electrical energy.
  • thermoelectric conversion When thermoelectric conversion is actually performed, it is common to use a structure in which p-type thermoelectric conversion elements and n-type thermoelectric conversion elements are used, and these are electrically connected in series alternately.
  • thermoelectric conversion modules can effectively utilize the heat emitted from industrial and consumer processes and moving objects and convert it into electricity, so thermoelectric conversion is attracting attention as an energy-saving technology that takes environmental issues into account. There is.
  • Patent Document 1 discloses that in a gap between a thermoelectric conversion element or a thermoelectric conversion module, heat is transferred by thermal radiation or convection, and the heat is transferred to the low-temperature side system through the gap without passing through the thermoelectric conversion element. It is described that a heat loss prevention structure is provided to prevent heat loss from occurring due to the heat loss. Further, in Patent Document 1, a heat loss prevention structure includes a plurality of radiation prevention plates so as to partition an internal space formed by a high temperature side insulating substrate and a low temperature side insulating substrate into a plurality of flat small spaces. It is described that it is constructed by arranging in multiple stages. Furthermore, it is described that the radiation prevention plate is made of a material with high heat reflectance, such as stainless steel, Ni-plated iron, aluminum (alumite), zinc, and the like.
  • thermoelectric conversion module described in Patent Document 1 by providing a radiation prevention plate, heat absorbed from the high temperature side system can be efficiently guided to each thermoelectric conversion element of the thermoelectric conversion module, improving thermoelectric conversion performance. It is said that it can be done.
  • thermoelectric conversion module described in Patent Document 1 does not consider insulating the thermoelectric conversion elements from each other in the radiation prevention plate, and there is a risk of short circuiting between the thermoelectric conversion elements.
  • thermoelectric conversion elements in order to suppress heat transferred from a high temperature side to a low temperature side in a region (space) between thermoelectric conversion elements, a plurality of thermoelectric conversion elements are connected between a pair of electrically insulating substrates.
  • a configuration is disclosed in which a porous insulating layer is filled in the region between a plurality of thermoelectric conversion elements, and a reflective metal layer is disposed in the middle part of the porous insulating layer in the height direction. Further, it is described that the reflective metal layer is placed 20 ⁇ m to 200 ⁇ m away from the thermoelectric conversion element, and that a porous insulating layer is inserted in between to form an electrically insulating state.
  • thermoelectric conversion module In the thermoelectric conversion module described in Patent Document 2, heat transfer due to gas convection is prevented by filling the space between the thermoelectric conversion elements with a porous insulating layer, and the reflective metal layer reflects thermal radiation. , restricts the transfer of heat due to radiation between high-temperature and low-temperature areas, and furthermore, the reflective metal layer is electrically insulated from the thermoelectric conversion element, so it does not have a negative effect on thermoelectromotive force. It is stated that.
  • thermoelectric conversion module described in Patent Document 2 has a porous resin layer such as an epoxy resin, which transmits radiant heat, and cannot obtain an excellent radiation suppression effect.
  • An object of the present invention is to provide a thermoelectric conversion module that can more efficiently suppress heat (more precisely, radiant heat) transferred from a high temperature side to a low temperature side in a space existing between a plurality of thermoelectric conversion elements. There is a particular thing.
  • the gist of the present invention is as follows. (1) A first electrically insulating substrate disposed on the high temperature side; and a second electrically insulating substrate disposed approximately parallel to the first electrically insulating substrate at a distance and on the low temperature side. , a plurality of thermoelectric conversion elements sandwiched between the first and second electrically insulating substrates, between the first electrically insulating substrate and the plurality of thermoelectric conversion elements, and the second electrically insulating substrate.
  • thermoelectric conversion module having a connection wiring disposed between a substrate and the plurality of thermoelectric conversion elements and connecting the plurality of thermoelectric conversion elements, between the first and second electrically insulating substrates
  • the radiant heat reflecting member includes at least one first radiant heat reflecting plate disposed substantially parallel to the first and second electrically insulating substrates, and the first radiant heat reflecting plate includes a first electrically insulating substrate. an insulating plate; and a first reflective layer that reflects radiant heat and is formed on at least one side of the first electric insulating plate and is disposed so as to be in contact with at least one thermoelectric conversion element of the plurality of thermoelectric conversion elements.
  • thermoelectric conversion module comprising an electrically insulating part that electrically insulates thermoelectric conversion elements from each other.
  • the first radiant heat reflecting plate is provided on both sides of the first electrically insulating plate so as not to contact the first reflecting layer and the thermoelectric conversion element, respectively, and is a second reflecting plate that reflects radiant heat.
  • the radiant heat reflecting member is formed on a second electric insulating plate and only one side or both sides of the second electric insulating plate, and is arranged so as not to come into contact with the thermoelectric conversion element.
  • the external area of the first electrically insulating board and the second electrically insulating board is the same as or larger than the external area of any of the first electrically insulating board and the second electrically insulating board, 3) The thermoelectric conversion module according to item 3).
  • thermoelectric conversion module according to any one of (2) to (5) above, wherein the first reflective layer and the second reflective layer are both formed by dry plating or wet plating.
  • the side radiant heat reflecting plate includes a third electrical insulating plate and a third reflective layer formed on one surface of the third electrical insulating plate to reflect radiant heat, and the third electrical insulating plate
  • An object of the present invention is to provide a thermoelectric conversion module that can more efficiently suppress heat (more precisely, radiant heat) transferred from a high temperature side to a low temperature side in a space existing between a plurality of thermoelectric conversion elements. There is a particular thing.
  • FIG. 1 is a perspective view of a thermoelectric conversion module of a first embodiment according to the present invention.
  • FIG. 2 is a cross-sectional view of the thermoelectric conversion module shown in FIG. 1 taken along line II.
  • FIG. 3 is a perspective view showing the thermoelectric conversion module shown in FIG. 1 with the first electrically insulating substrate and the first radiant heat reflecting plate removed.
  • FIG. 4 is a plan view showing an example of the first radiant heat reflecting plate.
  • FIG. 5 is a plan view showing another example of the first radiant heat reflecting plate.
  • FIG. 6 is a plan view showing another example of the first radiant heat reflecting plate.
  • FIG. 7 is a plan view showing another example of the first radiant heat reflecting plate.
  • FIG. 1 is a perspective view of a thermoelectric conversion module of a first embodiment according to the present invention.
  • FIG. 2 is a cross-sectional view of the thermoelectric conversion module shown in FIG. 1 taken along line II.
  • FIG. 3 is a perspective view showing the thermoelectric conversion module shown in FIG
  • FIG. 8A is a diagram for explaining how radiant heat is transmitted in a case where the transparent first electrically insulating plate has first reflective layers each having electrically insulating parts formed in different shapes on both sides.
  • the radiant heat reflecting member is composed of two translucent first electrically insulating plates, and these two first electrically insulating plates each have a first reflector in which the electrically insulating portions are formed in different shapes.
  • FIG. 3 is a diagram for explaining how radiant heat is transmitted when each layer is provided.
  • FIG. 8C is a diagram for explaining how radiant heat is transmitted when the non-transparent first electrically insulating plate has first reflective layers each having electrically insulating parts formed in different shapes on both sides. be.
  • FIG. 8A is a diagram for explaining how radiant heat is transmitted in a case where the transparent first electrically insulating plate has first reflective layers each having electrically insulating parts formed in different shapes on both sides.
  • the radiant heat reflecting member is composed of two translucent first electrically insulating plates, and these two first electrically insul
  • the radiant heat reflecting member is composed of two non-transparent first electrically insulating plates, and these two first electrically insulating plates each have a first electrically insulating portion formed with a different arrangement shape.
  • FIG. 4 is a diagram for explaining how radiant heat is transmitted when each device has a reflective layer.
  • FIG. 9 is a cross-sectional view of the thermoelectric conversion module of the second embodiment.
  • FIG. 10 is a cross-sectional view of the thermoelectric conversion module of the third embodiment.
  • FIG. 11 is a sectional view of a thermoelectric conversion module according to the fourth embodiment.
  • thermoelectric conversion modules of various embodiments according to the present invention will be described below.
  • FIG. 1 is a perspective view showing a thermoelectric conversion module according to a first embodiment of the present invention
  • FIG. 2 is a sectional view taken along line II of the thermoelectric conversion module shown in FIG. 1
  • FIG. FIG. 2 is a perspective view showing a state in which a first electrically insulating substrate and a first radiant heat reflecting plate are removed from the thermoelectric conversion module shown in FIG.
  • thermoelectric conversion module 1 of the first embodiment has a structure that utilizes the Seebeck effect and can convert thermal energy into electrical energy (electric power) in a usage environment with a temperature difference.
  • the illustrated thermoelectric conversion module 1 includes a first electrically insulating substrate 2, a second electrically insulating substrate 3, a plurality of thermoelectric conversion elements 4, first and second connection wirings 5, 6, and a first radiant heat reflecting plate 7. It mainly consists of
  • the first electrically insulating substrate 2 is disposed on the high temperature side, and the second electrically insulating substrate 3 is disposed approximately parallel to the first electrically insulating substrate 2 at a distance and on the low temperature side. be done.
  • the first electrically insulating substrate 2 and the second electrically insulating substrate 3 need to have electrical insulation properties, and in addition, preferably have excellent thermal conductivity, but there are particular considerations regarding the material and structure. Not limited. For example, it is sufficient that at least the surfaces of these electrically insulating substrates 2 and 3 have electrically insulating properties.
  • Suitable examples of the electrically insulating substrates 2 and 3 include materials having electrically insulating properties and high thermal conductivity, such as alumina (Al 2 O 3 ), aluminum nitride (AlN), and silicon nitride (Si). Ceramic materials such as 3 N 4 ) can be used, and glass epoxy substrates, glass substrates, etc.
  • electrically insulating substrates 2 and 3 can also be used as long as they are used in an environment at a temperature of about 200° C. or lower.
  • metal substrates such as copper, copper alloy, aluminum, and aluminum alloy whose surfaces are coated with an insulating layer can also be used as the electrically insulating substrates 2 and 3. It is preferable to use electrically insulating substrates 2 and 3 because thermal conductivity can be improved.
  • a columnar, prismatic, etc. A plurality of columnar thermoelectric conversion elements 4, eight p-type thermoelectric conversion elements 4a and eight n-type thermoelectric conversion elements 4b in FIG. It has a configuration in which it is sandwiched in a state where it is arranged in a shape.
  • thermoelectric conversion element 4 a first electrode 8 is formed on the end surface on the first electrically insulating substrate 2 side, and a second electrode 9 is formed on the end surface on the second electrically insulating substrate 3 side. Further, a first connection wiring 5 and a second connection wiring 6 are formed on the opposing surfaces of the first electrically insulating substrate 2 and the second electrically insulating substrate 3, respectively.
  • the first connection wiring 5 and the second connection wiring 6 are connected between the first electrically insulating substrate 2 and the plurality of thermoelectric conversion elements 4 (one end surface), and between the second electrically insulating substrate 3 and the plurality of thermoelectric conversion elements 4.
  • the thermoelectric conversion elements 4 are respectively disposed between (the other end surfaces of) the element 4 and connect the plurality of thermoelectric conversion elements 4, 4.
  • the materials of the first connection wiring 5 and the second connection wiring 6 are not particularly limited, and examples thereof include copper, copper alloy, and the like.
  • the first connection wiring 5 and the second connection wiring 6 are formed in a rectangular planar shape in FIG. 3 . Note that the size (planar size) of the first connection wiring 5 and the second connection wiring 6 is determined depending on the size of the thermoelectric conversion element 4 connected to the first connection wiring 5 and the second connection wiring 6. The area is set to be the same as or slightly larger than the area of the end face of the element 4.
  • thermoelectric conversion elements 4 for example, a plurality of p-type thermoelectric conversion elements 4a and a plurality of n-type thermoelectric conversion elements 4b are connected to each other via a first electrode 8.
  • the p-type thermoelectric conversion element 4a and the n-type thermoelectric conversion element 4b are electrically connected in series by being connected to the first connection wiring 5 through the second electrode 9 and to the second connection wiring 6 through the second electrode 9. configured to be connected.
  • the thermoelectric conversion elements 4a, 4b and the first and second connection wirings 5, 6 can be connected by bonding (adhesion) using, for example, silver paste.
  • the first electrode 8 and the second electrode 9 are not particularly limited, but may be formed of a metal such as Ni or an alloy by plating, vapor deposition, or the like.
  • thermoelectric conversion material used for the thermoelectric conversion element 4 is not particularly limited, but includes, for example, a bismuth-tellurium compound, a silicon-germanium (Si-Ge) compound, a silicide compound, a skutterudite compound, a clathrate compound, Examples include Heusler compounds and half Heusler compounds.
  • a clathrate compound for at least one of the p-type thermoelectric conversion element 4a and the n-type thermoelectric conversion element 4b. Thermal conductivity can be lowered by the clathrate compound, and by changing the composition of the clathrate compound, optimal performance can be obtained for that temperature range, so the thermoelectric conversion efficiency of the thermoelectric conversion module 1 can be increased. I can do it.
  • thermoelectric conversion element 4 formed of a clathrate compound does not contain environmentally hazardous substances such as bismuth (Bi), tellurium (Te), and selenium (Se), and contains a p-type thermoelectric conversion material and an n-type thermoelectric conversion material. It is particularly preferable because it can be manufactured separately.
  • each thermoelectric conversion element 4 is not particularly limited, but for example, in the case of a prismatic thermoelectric conversion element 4 as shown in FIG. 1, the length of one side when the thermoelectric conversion element 4 is viewed in cross section It has a rectangular shape with dimensions of about 0.5 mm to 3 mm, and a height of about 2 mm to 20 mm.
  • thermoelectric conversion module 1 of the present embodiment between the first electrically insulating substrate 2 and the second electrically insulating substrate 3, approximately It has a radiant heat reflecting member composed of at least one first radiant heat reflecting plate 7 arranged in parallel.
  • FIG. 4 is a plan view showing the first radiant heat reflecting plate 7.
  • the first radiant heat reflecting plate 7 has a plurality of through-holes 10, which are 16 through-holes in FIG. 4, each having a size that allows the thermoelectric conversion elements 4, 4, . , 10, .
  • the number of penetration parts 10 is the same as the number of thermoelectric conversion elements 4 configuring the thermoelectric conversion module 1 , and the penetration parts 10 formed in the first radiant heat reflecting plate 7 are arranged at positions corresponding to the number of the thermoelectric conversion elements 4 . Make sure it matches the placement location.
  • the first radiant heat reflecting plate 7 serves to suppress heat transferred from the high temperature side to the low temperature side in the area (space) between the thermoelectric conversion elements 4 . , according to the contour shape and dimensions of the side surface of the thermoelectric conversion element 4 so that there is no gap between the penetration part 10 formed in the first radiant heat reflecting plate 7 and the thermoelectric conversion element 4 inserted into the penetration part 10. It is preferable to set the shape and dimensions of the penetrating portion 10 accordingly.
  • the first radiant heat reflecting plate 7 shown in FIG. 4 has 16 rectangular through-holes 10 arranged in a grid pattern.
  • the first radiant heat reflecting plate 7 includes a first electrically insulating board 11 and a first electrically insulating board 11 formed on at least one surface of the first electrically insulating board 11, in FIG. It is preferable to have one reflective layer 12. Although not limited, it is more preferable that the first radiant heat reflector 7 is disposed such that the first reflective layer 12 faces the first electrically insulating substrate 2, and the first reflective layer 12 is preferably disposed so as to face the first electrically insulating substrate 2. It is more preferable that the film be formed on both sides of the sexual substrate 2.
  • the first reflective layer 12 has an electrically insulating part 13 at a position spaced outward from the outer edge of the penetrating part 10 so as to surround the outer periphery of the thermoelectric conversion elements 4a and 4b. Therefore, the first reflective layer 12 is arranged so as to be in contact with at least one thermoelectric conversion element among the plurality of thermoelectric conversion elements 4a and 4b.
  • the electrically insulating portion 13 may be formed in a concave shape such as a groove as shown in FIG. 2, or may be formed in a convex shape using an electrically insulating material such as rubber or resin.
  • the elements 4a, 4b and the first reflective layer 12 can be electrically insulated.
  • first radiant heat reflecting plate 7A-1 of another embodiment may be formed in a grid-like arrangement so as to be electrically insulated from each other.
  • first radiant heat reflecting plates 7A-2 and 7A-3 of other embodiments as shown in FIGS. It is also possible to cut out a portion of the edges of the radiant heat reflecting plates 7A-2 and 7A-3.
  • the first radiant heat reflecting plate 7A-2 shown in FIG. The first radiant heat reflecting plate 7A-3 shown in FIG. A case is shown in which four through-holes 10 are formed as cross-shaped cutouts.
  • the size in the plane direction (vertical and horizontal directions) of the thermoelectric conversion module of the heat source is equal to or less than the size in the plane direction of the thermoelectric conversion module.
  • thermoelectric conversion module of the heat source in the planar direction is sufficiently smaller than the size of the thermoelectric conversion module in the planar direction, By doing so, the area of the first radiant heat reflecting plates 7A-2 and 7A-3 can be reduced compared to the grid-like case like 7 and 7A-1 described above while maintaining the same number of arranged thermoelectric conversion elements. Since it can be made smaller, the size of the entire thermoelectric conversion module can be made smaller, and the output per installation area and output density of the thermoelectric conversion module can be improved. Moreover, this also makes it possible to further reduce installation space, material costs, and the like.
  • the electrical insulating parts 13A-2 and 13A-3 of the first reflective layers 12A-2 and 12A-3 of the first radiant heat reflecting plates 7A-2 and 7A-3 have the same characteristics as those described above. This is similar to the layer 12A-1 and the electrically insulating portion 13A-1.
  • the radiant heat reflecting member of the thermoelectric conversion module 1 shown in FIGS. 1 and 2 is configured with one first radiant heat reflecting plate 7, the radiant heat reflecting member is not limited to this. It may also be configured with the first radiant heat reflecting plate 7. By installing a plurality of first radiant heat reflecting plates 7 using the space from the high temperature side to the low temperature side, a more excellent radiation suppression effect can be obtained.
  • first reflective layers 12B and 12C are formed on both sides of the first electrically insulating plate 11, it is preferable to have the first reflective layers 12B and 12C on which electrically insulating parts 13B and 13C of different shapes are formed.
  • FIG. 8A even if the radiant heat (thin black arrow H) passes through the electrical insulation part 13B (or electrical insulation part 13C) of one first reflective layer 12B, 12C (thin black arrow P), Since the radiation is reflected by the first reflective layers 12C and 12B (white arrow R), a higher radiation suppression effect can be obtained.
  • FIG. 8A even if the radiant heat (thin black arrow H) passes through the electrical insulation part 13B (or electrical insulation part 13C) of one first reflective layer 12B, 12C (thin black arrow P), Since the radiation is reflected by the first reflective layers 12C and 12B (white arrow R), a higher radiation suppression effect can be obtained.
  • FIG. 8A shows a case where one first electrically insulating plate 11 has first reflective layers 12B and 12C on both sides of which electrically insulating parts 13B and 13C of different shapes are formed, but as shown in FIG. 8B, Even when the radiant heat reflecting member includes a plurality of first radiant heat reflecting plates 7, 7D each having a first reflective layer 12, 12D on one side of the first electrically insulating plate 11, 11D, each electrically insulating portion Similar effects can be obtained by having different shapes of 13 and 13D.
  • the radiant heat reflecting member constituted by at least one first radiant heat reflecting plate 7 has a first electrical insulation that is lower than the height direction center position (height direction center line C) of the thermoelectric conversion element 4. It is preferable to be located on the sexual substrate 2 side. Since the first radiant heat reflecting plate 7 (particularly the first reflective layer 12) is located closer to the first electrically insulating substrate 2 than the center position in the height direction (center line C in the height direction) of the thermoelectric conversion element 4, high temperatures can be achieved. It becomes possible to obtain a sufficient temperature gradient of the thermoelectric conversion element 4 from low temperature to low temperature, and thermoelectric performance as designed can be obtained.
  • one or more spacer members made of an electrically insulating material may be provided between the second electrically insulating substrate 3 and the first radiant heat reflecting plate 7.
  • the spacer members can be arranged continuously (e.g., a ring-shaped member) or dotted (a plurality of block-shaped members arranged at equal intervals) along the edge of the first radiant heat reflecting plate 7 along the contour. . Further, when two or more first radiant heat reflecting plates 7 are arranged, one or more spacer members made of an electrically insulating material may be arranged between the respective first radiant heat reflecting plates 7.
  • the first electrically insulating board 11 needs to have electrical insulation, but the area (space) between the thermoelectric conversion elements 4, 4 In order to make it difficult for heat to be transferred from the high temperature side to the low temperature side, it is preferable to use a material with low thermal conductivity. In particular, it is preferable that the thermal conductivity of the first electrical insulating plate 11 is lower than that of the thermoelectric conversion elements 4a and 4b.
  • the first electrical insulating board 11 is preferably used as a base material for the first radiant heat reflecting plate 7 from the viewpoint of ensuring the strength of the first radiant heat reflecting plate 7.
  • the thickness of the first electrically insulating plate 11 is preferably 0.1 to 0.5 mm.
  • the material of the first electrical insulating plate 11 is not particularly limited, but for example, a glass substrate, a glass epoxy substrate, etc. can be used.
  • a transparent (translucent) substrate such as a glass substrate
  • radiant heat (thin black arrow H) is transmitted (thin black arrow P) as shown in FIGS. 8A and 8B.
  • a non-transparent (non-light-transmitting) substrate such as a glass epoxy substrate
  • radiant heat (thin black arrow H) is absorbed (thick black arrow A) and/or as shown in FIGS. 8C and 8D.
  • the external area of the first electrically insulating board 11 is preferably the same as or larger than the external area of any of the first and second electrically insulating substrates 2 and 3.
  • the first reflective layer 12 is a region (space) between the thermoelectric conversion elements 4 , which is formed on the first electrically insulating plate 11 in order to reflect radiant heat transmitted from the high temperature side and prevent it from being transmitted to the low temperature side. Formed on at least one side.
  • the material of the first reflective layer 12 is not particularly limited, but is preferably made of a metal with high optical reflectance, such as gold, silver, copper, or aluminum.
  • the thickness of the first reflective layer 12 is preferably 0.1 to 100 ⁇ m.
  • the first reflective layer 12 As a method for forming the first reflective layer 12 on the first electrically insulating board 11, for example, the first reflective layer 12 made of metal foil such as gold, silver, copper, or aluminum is coated on the surface of the first electrically insulating board 11.
  • the first reflective layer 12 made of metal foil such as gold, silver, copper, or aluminum is coated on the surface of the first electrically insulating board 11.
  • a method of forming by bonding or the like may be mentioned, other known methods may also be employed.
  • the first reflective layer 12 is preferably formed by dry or wet plating.
  • FIG. 9 shows a thermoelectric conversion module 1A according to the second embodiment of the present invention, and is cut at the same position of the thermoelectric conversion module 1A as the position on the line II of the thermoelectric conversion module 1 shown in FIG. FIG.
  • each component of the thermoelectric conversion module 1A of the second embodiment is given the same reference numeral when it is the same as each component of the thermoelectric conversion module 1 of the first embodiment.
  • the first radiant heat reflecting plate 7 has a first reflective layer 12 formed on at least one side to reflect radiant heat.
  • a first radiant heat reflecting plate is provided on the back side of the surface of the first radiant heat reflecting plate 7 on which the first reflective layer 12 is formed so as not to contact the thermoelectric conversion element 4.
  • Two reflective layers 15 are formed. That is, in the thermoelectric conversion module 1A of the second embodiment, the first radiant heat reflecting plate 7 is provided on both sides of the first electrical insulating plate 11 so as not to contact the first reflective layer 12 and the thermoelectric conversion elements 4a and 4b, respectively.
  • a second reflective layer 15 that reflects radiant heat is provided.
  • the first reflective layer 12 shown in FIGS. 8A to 8D has a higher radiation suppression effect, as in the case of having the electrically insulating part 13 of a different shape. Obtainable.
  • the second reflective layer 15 can employ the same formation method, material, and dimensions as the first reflective layer 12. Note that the first reflective layer 12 and the second reflective layer 15 may be formed of different materials.
  • the first reflective layer 12 is formed on the first electrically insulating substrate 2 side, and the second reflective layer 15 is formed on the second electrically insulating substrate 3 side.
  • the present invention is not limited to this, and the second reflective layer 15 may be formed on the first electrically insulating substrate 2 side, and the first reflective layer 12 may be formed on the second electrically insulating substrate 3 side. .
  • the radiant heat reflecting member which is composed of at least one first radiant heat reflecting plate 7 having a first reflecting layer 12 and a second reflecting layer 15 on both sides, is located at the center position in the height direction of the thermoelectric conversion element 4 (center in the height direction). It is preferable to be located closer to the first electrically insulating substrate 2 than line C). Since the first radiant heat reflecting plate 7 (at least the first reflective layer 12) is located closer to the first electrically insulating substrate 2 than the center position in the height direction (center line C in the height direction) of the thermoelectric conversion element 4, high temperatures can be achieved. It becomes possible to obtain a sufficient temperature gradient of the thermoelectric conversion element 4 from low temperature to low temperature, and thermoelectric performance as designed can be obtained.
  • FIG. 10 shows a thermoelectric conversion module 1B according to a third embodiment of the present invention, and the thermoelectric conversion module 1B is cut at the same position on the line II of the thermoelectric conversion module 1 shown in FIG. FIG.
  • symbol is attached
  • the radiant heat reflecting member includes, in addition to the first radiant heat reflecting plate 7 shown in the first embodiment, a second electric insulating plate 20 and one side of the second electric insulating plate 20. It further includes at least one second radiant heat reflecting plate 19 having a second reflective layer 15 that reflects radiant heat and is formed on only or both sides of the thermoelectric conversion elements 4a, 4b so as not to contact them.
  • the radiant heat reflecting member is composed of a plurality of radiant heat reflecting plates such as the first radiant heat reflecting plate 7 and the second radiant heat reflecting plate 19, a higher radiation suppression effect can be achieved as in the case shown in FIGS. 8A to 8D. Obtainable.
  • the second electrically insulating board 20 can adopt the same forming method, material, and dimensions as the first electrically insulating board 11. Although not limited, it is preferable that the external area of the second electrically insulating board 20 is the same as or larger than the external area of any of the first and second electrically insulating substrates 2 and 3, similarly to the first electrically insulating board 11. . Note that, like the first electrical insulating board 11, the thermal conductivity of the second electrical insulating board 20 is smaller than that of the thermoelectric conversion elements 4a, 4b in the area (space) between the thermoelectric conversion elements 4, 4. This is preferable because it makes it difficult for heat to be transferred from the high temperature side to the low temperature side.
  • the radiant heat reflecting member constituted by the first radiant heat reflecting plate 7 and the second radiant heat reflecting plate 19 has at least one of the first electrically insulating parts lower than the height direction center position (height direction center line C) of the thermoelectric conversion element 4. Preferably, it is located on the substrate 2 side.
  • the first radiant heat reflector 7 (especially the first reflective layer 12) or the second radiant heat reflector 19 (especially the second reflective layer 15) is lower than the height center position (height center line C) of the thermoelectric conversion element 4.
  • FIG. 11 shows a thermoelectric conversion module 1C according to a fourth embodiment of the present invention, and the thermoelectric conversion module 1C is cut at the same position on line II of the thermoelectric conversion module 1 shown in FIG. FIG.
  • symbol is attached
  • thermoelectric conversion module 1C of the fourth embodiment uses at least one first radiant heat reflecting plate 7 that constitutes the thermoelectric conversion module 1 of the first embodiment (FIG. 2), and A configuration is adopted which further includes a radiant heat reflecting member (one first radiant heat reflecting plate 7 in FIG. 11) and a side radiant heat reflecting plate 25 disposed to substantially surround the second electrically insulating substrate 3.
  • a radiant heat reflecting member one first radiant heat reflecting plate 7 in FIG. 11
  • a side radiant heat reflecting plate 25 disposed to substantially surround the second electrically insulating substrate 3.
  • the side radiant heat reflecting plate 25 includes a third electrically insulating plate 26 and a third reflective layer 27 that is formed on one surface of the third electrically insulating board 26 and reflects radiant heat.
  • the other surface is arranged so as to face the side surface of the radiant heat reflecting member and the side surface of the second electrically insulating substrate 3.
  • the side radiant heat reflecting plate 25 completely surrounds the radiant heat reflecting member (in FIG. 11, one first radiant heat reflecting plate 7) and the second electrically insulating substrate 3; however, in actual thermoelectric conversion
  • the module 1C has structural limitations such as the need to provide the second connection wiring 6. Therefore, the side radiant heat reflecting plate 25 only needs to substantially surround the radiant heat reflecting member and the second electrically insulating substrate 3 in a portion not subject to structural restrictions.
  • first radiant heat reflecting plate 7 is used as the radiant heat reflecting member, but the structure is not limited to such a structure, and a plurality of first radiant heat reflecting plates 7 or a plurality of first radiant heat reflecting plates 7 or A second radiant heat reflector 19 may be used together with the first radiant heat reflector 7.
  • the third electrically insulating plate 26 can be formed using the same method and material as the first electrically insulating board 11, and the third reflective layer 27 can be formed using the same method and material as the first reflective layer 12. can be adopted. Note that, like the first electrical insulating board 11, the thermal conductivity of the third electrical insulating board 26 is smaller than that of the thermoelectric conversion elements 4a, 4b in the area (space) between the thermoelectric conversion elements 4, 4. This is preferable because it makes it difficult for heat to be transferred from the high temperature side to the low temperature side.
  • thermoelectric conversion module 1 ⁇ Method for manufacturing thermoelectric conversion module>
  • a method for manufacturing the thermoelectric conversion module 1 according to the first embodiment of the present invention will be described below.
  • the first electrically insulating substrate 2 on which the first connection wiring 5 was formed was formed by etching an alumina substrate on which copper foil was pasted. Create.
  • a second electrically insulating substrate 3 on which a second connection wiring 6 is formed is produced.
  • thermoelectric conversion element 4a and n-type thermoelectric conversion element 4b A sintered body of a p-type thermoelectric conversion material and an n-type thermoelectric conversion material has a cross-sectional dimension of 2 mm x 2 mm and a height dimension of 3 mm. Eight p-type thermoelectric conversion elements 4a and eight n-type thermoelectric conversion elements 4b having a rectangular parallelepiped shape are cut out, and a first electrode made of Ni is formed by vapor deposition on both end faces of 2 mm x 2 mm of each cut out element 4a, 4b. 8 and a second electrode 9 are formed.
  • thermoelectric conversion module 1 On the second connection wiring 6 formed on the second electrically insulating substrate 3, eight p-type thermoelectric conversion elements 4a and eight n-type thermoelectric conversion elements 4b are arranged at alternate intervals.
  • thermoelectric conversion element 4a, 4b and the second connection wiring 6 are bonded using silver paste.
  • the radiant heat reflection plate 7 is opened with the penetration part 10 of the radiant heat reflection plate 7 aligned with all the thermoelectric conversion elements 4a and 4b. , and is moved through the second electrically insulating substrate 3 and installed at a position in contact with the second connection wiring 6 formed on the second electrically insulating substrate 3.
  • thermoelectric conversion module 1 can be manufactured by joining the first connection wiring 5 using silver paste.
  • thermoelectric conversion module 2 first electrically insulating substrate 3 second electrically insulating substrate 4 thermoelectric conversion element 4a p-type thermoelectric conversion element 4b n-type thermoelectric conversion element 5 first connection wiring 6 second connection wiring 7, 7A-1, 7A-2, 7A-3 First radiant heat reflecting plate 8 First electrode 9 Second electrode 10 Penetrating portion 11 First electrical insulating plate 12, 12A-1, 12A-2, 12A-3 First reflective layer 13, 13A- 1, 13A-2, 13A-3 Electrical insulation part 15 Second reflective layer 19 Second radiant heat reflecting plate 20 Second electrical insulating plate 25 Side radiant heat reflecting plate 26 Third electrical insulating plate 27 Third reflective layer

Landscapes

  • Cooling Or The Like Of Semiconductors Or Solid State Devices (AREA)

Abstract

L'invention concerne un module de conversion thermoélectrique qui peut supprimer plus efficacement la chaleur (plus strictement, la chaleur rayonnante) qui est transmise d'un côté à haute température à un côté basse température dans un espace présent entre une pluralité d'éléments de conversion thermoélectrique.　Un module de conversion thermoélectrique (1) de la présente invention comprend un premier substrat électro-isolant (2), un second substrat électro-isolant (3), une pluralité d'éléments de conversion thermoélectrique (4a, 4b) et des fils de connexion (5, 6) et comprend un élément réfléchissant la chaleur de rayonnement composé d'au moins une première plaque de réflexion de chaleur de rayonnement (7). La première plaque de réflexion de chaleur de rayonnement (7) comprend une première plaque d'isolation électrique (11) et une première couche réfléchissante (12) qui est formée sur au moins une surface de la première plaque d'isolation électrique (11) et qui est disposée de façon à être en contact avec au moins un élément de conversion thermoélectrique de la pluralité d'éléments de conversion thermoélectrique (4a, 4b). La première plaque de réflexion de chaleur de rayonnement (7) comporte une pluralité de parties trous traversants (10) formées à l'intérieur de celle-ci qui sont dimensionnées pour permettre le passage de la pluralité d'éléments de conversion thermoélectrique (4a, 4b), chacun dans un état défini séparément. La première couche réfléchissante (12) comprend une partie d'isolation électrique (13) qui isole électriquement la pluralité d'éléments de conversion thermoélectrique (4a, 4b) les uns des autres.
PCT/JP2023/008518 2022-03-16 2023-03-07 Module de conversion thermoélectrique WO2023176581A1 (fr)

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JP2022041087 2022-03-16
JP2022-041087 2022-03-16

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WO2023176581A1 true WO2023176581A1 (fr) 2023-09-21

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005079347A (ja) * 2003-08-29 2005-03-24 Toshiba Corp 熱電変換装置
JP2012038980A (ja) * 2010-08-09 2012-02-23 Fujitsu Ltd 熱電変換モジュールおよびその製造方法
US20150034138A1 (en) * 2013-07-31 2015-02-05 Behr Gmbh & Co. Kg Thermoelectric module
WO2017164217A1 (fr) * 2016-03-24 2017-09-28 三菱マテリアル株式会社 Module de conversion thermoélectrique
WO2022196724A1 (fr) * 2021-03-16 2022-09-22 古河電気工業株式会社 Module de conversion thermoélectrique

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005079347A (ja) * 2003-08-29 2005-03-24 Toshiba Corp 熱電変換装置
JP2012038980A (ja) * 2010-08-09 2012-02-23 Fujitsu Ltd 熱電変換モジュールおよびその製造方法
US20150034138A1 (en) * 2013-07-31 2015-02-05 Behr Gmbh & Co. Kg Thermoelectric module
WO2017164217A1 (fr) * 2016-03-24 2017-09-28 三菱マテリアル株式会社 Module de conversion thermoélectrique
WO2022196724A1 (fr) * 2021-03-16 2022-09-22 古河電気工業株式会社 Module de conversion thermoélectrique

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