WO2017046484A1 - Thermoelectric module and device, in particular for generating an electric current in a motor vehicle - Google Patents

Thermoelectric module and device, in particular for generating an electric current in a motor vehicle Download PDF

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Publication number
WO2017046484A1
WO2017046484A1 PCT/FR2016/052257 FR2016052257W WO2017046484A1 WO 2017046484 A1 WO2017046484 A1 WO 2017046484A1 FR 2016052257 W FR2016052257 W FR 2016052257W WO 2017046484 A1 WO2017046484 A1 WO 2017046484A1
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Prior art keywords
fins
thermoelectric
module according
thermoelectric element
fin
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PCT/FR2016/052257
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French (fr)
Inventor
Kamel Azzouz
Patrick Boisselle
Cédric DE VAULX
Véronique MONNET
Ambroise SERVANTIE
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Valeo Systemes Thermiques
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Publication of WO2017046484A1 publication Critical patent/WO2017046484A1/en

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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

  • Thermoelectric module and device in particular for generating an electric current in a motor vehicle
  • the present invention relates to a module and a thermoelectric device, in particular for generating an electric current in a motor vehicle.
  • thermo devices also called electric thermo generators or TEG according to the acronym "ThermoElectric Generator”
  • TEG electric thermo generators
  • electric thermo elements to generate an electric current in the presence of a temperature gradient between two of their opposite faces according to the phenomenon known as the Seebeck effect.
  • These devices comprise a stack of first tubes, intended for the circulation of the exhaust gases of an engine, and second tubes, intended for the circulation of a heat transfer fluid of a cooling circuit.
  • the electrical thermo elements are sandwiched between the tubes so as to be subjected to a temperature gradient from the temperature difference between the hot exhaust gases and the cold cooling fluid.
  • thermoelectric elements in which the temperature gradient for generating the electric current is imposed between two of their opposite cylindrical faces, the hot fluid and the cold fluid circulating coaxially, one inside the ring and the other outside. This type of thermoelectric elements presents integration difficulties which lead to the commitment of a large amount of material burdening the cost and increasing the thermal inertia of the device.
  • thermoelectric module comprising annular-shaped thermoelectric elements in which the first fluid and the second fluid circulate transversely relative to one another.
  • a thermoelectric module is shown in FIG. 1 and comprises a plurality of annular-shaped electric thermoelectric elements 1 arranged in the longitudinal extension of one another in a coaxial manner, with, for example, an alternation of electric thermoelectric elements.
  • Each thermoelectric element 1 comprises fins 2 extending from the outer periphery, transversely and radially.
  • These fins 2 make it possible to promote heat exchanges with the exhaust hot gases 3 flowing through said fins 2, a cold fluid 4 flowing in the center of the electric thermoelectric elements 1 through a tube 5, and extracting the maximum heat from the heat sources. exhaust gas to transfer it to thermoelectric materials.
  • a cylindrical envelope covering the fins 2 of the electric thermoelectric elements 1 which are assembled in the form of a cylindrical pencil 6 is usually used, the pencil 6 of electric thermoelectric elements 1 being inserted in the cylindrical casing whose inner diameter is adjusted to the outer diameter of the fins 2 which then have a circular shape.
  • several rods 6 can be assembled together, the number of rods 6 depending on the desired electrical power.
  • Said fins 2 are usually machined from a metal cylinder so that it is not possible to adapt the heat exchange performance, such as the space between two adjacent fins in particular, to the conditions in which the electric heat exchanger will be used.
  • machining fins is a particularly long and expensive manufacturing process, which strike the cost of manufacturing the heat exchanger.
  • thermoelectric module comprising at least a plurality of cylindrical thermoelectric elements comprising a central circular recess, capable of generating an electric current under the action of a gradient temperature exerted between a first outer face defined by an outer periphery surface and a second inner face defined by an inner periphery surface, a first fluid being adapted to flow through the central recess and a second fluid being adapted to circulating around the outer periphery, said module further comprising an outer tubular electrode integral with the outer face of each thermoelectric element, and fins extending from the outer face of said thermoelectric element, each fin having a central recess of internal diameter just greater than the outer diameter of said thermoelectric element and being force-fitted on the outer face of the outer electrode of said thermoelectric element.
  • said module further comprises an inner tubular electrode integral with the inner face of each thermoelectric element.
  • said fins extend perpendicularly to the axis of their central recess.
  • the difference between the outer diameter of said thermoelectric element and the inner diameter of each fin is between 0.05 and 0.15 mm.
  • the difference between the outer diameter of said thermoelectric element and the internal diameter of each fin is 0.1 mm.
  • the fins extend parallel to each other. According to a first exemplary embodiment, the fins are flat.
  • the fins are corrugated. Such an undulating form of the fins makes it possible to increase the convection between the hot exhaust gases and said fins.
  • each fin comprises a collar integral with the inner edge of said fins, said collar having a width greater than the thickness of said fin.
  • each fin has at least one day obscured by louvers.
  • thermoelectric device comprising a plurality of modules as described above.
  • said device is configured to be positioned in a motor vehicle exhaust gas duct so that said gases circulate between the fins, said gases defining the second fluid.
  • FIG. 1 is a diagrammatic representation in perspective of a thermoelectric module of the prior art
  • FIG. 2 is a perspective view of the assembly of two electric thermoelectric elements of a thermoelectric module according to the invention
  • FIG. 3 is an exploded perspective view of the assembly of two thermoelectric elements and fins of a thermoelectric module according to the invention
  • FIG. 4 is a perspective view of two thermoelectric elements and assembled fins of a thermoelectric module according to the invention.
  • FIG. 5 is a diagrammatic representation in longitudinal section of a thermoelectric element and fins of a thermoelectric module according to the invention
  • FIG. 6 is a diagrammatic representation in longitudinal section of a fin of a thermoelectric module according to the invention
  • FIG. 7 is a perspective view of an alternative embodiment of a fin of a thermoelectric module according to the invention.
  • FIG. 8 is a perspective view of the louvers of the variant embodiment of the fin of the thermoelectric module according to the invention shown in FIG. 7.
  • thermoelectric module said module comprising a first so-called hot circuit capable of allowing the circulation of a first fluid, in particular the exhaust gases of an engine, and a second circuit 4 said cold adapted to allow the circulation of a second fluid, including a heat transfer fluid of a cooling circuit, lower temperature than the first fluid.
  • Said second fluid thus having a heat exchange coefficient greater than said first fluid.
  • Said module comprises at least one thermoelectric element 1, here a plurality of thermoelectric elements ⁇ , ⁇ , cylinder-shaped or straight prism and having a central recess, capable of generating an electric current under the action of a a temperature gradient exerted between a first outer face 11a defined by an outer periphery surface and a second inner face 11b defined by an inner periphery surface, the second fluid being adapted to flow through the central recess in a tube 5 and the first fluid being for circulating around the outer periphery.
  • the outer 11a and inner faces 11b of the electric thermoelectric elements 1 are for example circular. However, more generally, any section of rounded shape, such as an oval shape for example, and / or polygonal is possible.
  • Such elements operate, according to the Seebeck effect, by making it possible to create an electric current in a load connected between the inner faces 11b and outer 11a of the electric thermo elements ⁇ , ⁇ subjected to the temperature gradient.
  • such elements consist, for example, of Bismuth and Tellurium (Bi 2 Te 3 ).
  • thermoelectric elements may be, for a first part, elements lp of a first type, said P, making it possible to establish a difference of electric potential in a direction, said positive, when they are subjected to a temperature gradient given, and, for the other part, elements ln of a second type, said N, allowing the creation of a difference of electric potential in an opposite direction, said negative, when they are subjected to the same temperature gradient .
  • thermo elements 1 shown consist of a ring in one piece. They may however be formed of several pieces each forming an angular portion of the ring.
  • the outer surface 11a has, for example, a radius of between 1.5 and 4 times the radius of the inner surface 11b. It may be a radius equal to about 2 times that of the inner surface 11b.
  • Said thermoelectric element 1 has, for example, two opposite parallel flat faces. In other words, the ring constituting the thermoelectric element 1 is of rectangular annular section.
  • Said thermoelectric elements lp, ln are arranged, for example, in the longitudinal extension of one another, in particular in a coaxial manner, and the P-type thermoelectric elements alternate with the N-type thermoelectric elements, according to a direction D. They are, in particular, of identical shape and size. They may, however, have a thickness, that is to say a dimension between their two planar faces, different from one type to another, particularly depending on their electrical conductivity.
  • thermoelectric elements lp, ln are, for example, grouped in pairs, each pair being formed of a said P type thermoelectric element and a said N type thermoelectric element, and said module is configured to allow a current flow between the first surfaces of the electric thermoelectric elements 1 of the same pair and a flow of current between the second surfaces of each of the electric thermoelectric elements 1 of the same pair and the thermoelectric element 1 adjacent to the neighboring pair. In this way, a series circulation of the electric current is ensured between the electric thermoelectric elements lp, ln arranged next to one another in the direction D.
  • Said module may further comprise electrical insulation means, not shown in the figures, arranged between two faces vis-à-vis neighboring electric thermo elements lp, ln according to the longitudinal extension direction D of the tube 5.
  • said module comprises first electrical connection means 6 connecting the outer periphery surfaces 11a of two of said thermoelectric elements 11n and 1p, provided adjacent and of different types.
  • Said first electrical connection means consist of a tubular electrode 6 said external integral with the outer face of each thermoelectric element ln, lp, copper allowing brazing two electric thermo elements ln, lp contiguous.
  • This outer tubular electrode 6 has a thickness of between 0.1 and 0.3 mm for thermoelectric elements ⁇ , ⁇ having an external diameter of between 15 and 19 mm.
  • the outer electrode 6 may consist of any layer of electrically conductive material, such as a nickel layer for example without departing from the scope of the invention. Furthermore, the thickness of the outer electrode 6 can easily be determined by the skilled person and depends, in addition to the material in which it is obtained, the outer diameter of the thermoelectric elements ⁇ , ⁇ .
  • Said module advantageously comprises secondary exchange surfaces, in particular fins 2, with the second fluid.
  • Said fins 2 are arranged, for example, transversely, in particular radially to said electric thermo elements 1. They are here positioned parallel to each other with a spacing allowing a good heat exchange with the second fluid while limiting the losses of charges.
  • Said fins 2 may comprise a catalytic coating to ensure a catalytic conversion of toxic components of the second fluid.
  • said module can in this way equip a catalytic converter in addition or substitution of the components conventionally used for catalysis in such equipment.
  • said fins 2 consist of circular washers comprising a collar 7 integral with the inner edge of said washers, said collar 7 having a width greater than the thickness of said fin 2.
  • the fins are obtained for example in aluminum and have a thickness of about 0.1 mm.
  • said fins may be obtained in any other thermally conductive material such as stainless steel for example, the thickness of the fins being then easily adaptable by the skilled person.
  • the thermal conduction of stainless steel being lower than that of aluminum, the thickness of fins 2 obtained in stainless steel should be between 0.14 and 0.16 approximately.
  • the flanges 7 of the fins 2 extend from one side of said fins.
  • the collars 7 may extend on either side of the fins 2 without departing from the scope of the invention.
  • Said fins 2 are fixed on the outer electrode 6 by crimping.
  • the difference between the outer diameter of the outer electrodes 6 of said electric thermo elements ln, lp and the inner diameter of each fin 2 is between 0.05 and 0.15 mm, for external electrodes having an outside diameter of about 17, 4 mm, to allow a force fit on the outer face of the outer electrodes 6 of said thermoelectric elements ln, lp.
  • the difference between the outer diameter of the outer electrodes 6 of said electric thermo elements ln, lp and the inner diameter of each fin 2 is 0.1 mm.
  • the pitch between two adjacent fins 2 is determined by the width of the flanges 7 of said fins, the width of said flanges 7 can be adapted to adapt the pitch between the fins 2 depending on the conditions of use of the heat exchanger .
  • the fins 2 are flat and extend parallel to each other; however, in order to improve the performance of the fins 2, that is to say the convection between the hot exhaust gases and the fins 2, said fins 2 may be corrugated.
  • said fins 2 may have a rough surface condition, obtained by sanding for example, also to improve the efficiency of said fins.
  • each fin 2 has 6 days Rectangulars evenly distributed around the fin and louvers 9 also have a rectangular shape, the slats 10 louvers 9 extending transversely. It will be appreciated that the shape and number of days 8 as well as the shape, number and orientation of the lamellae 10 can easily be optimized by those skilled in the art.
  • the module may furthermore comprise second electrical connection means, not shown in the figures, establishing an electrical connection between the inner periphery surfaces of two of said adjacent thermoelectric elements 1, of different types and not connected by said first electrical connection means.
  • Said second electrical connection means comprise, for example, an inner tubular electrode, integral with the inner face of each thermoelectric element.
  • said first and second electrical connection means connect in pairs said electric thermoelectric elements 1 so as to establish an electrical circulation in series between said thermoelectric elements 1 of the module.

Abstract

The present invention relates to a thermoelectric module including at least one plurality of cylindrical thermoelectric elements (1n, 1p) including a central circular recess, a first fluid being intended for circulating through the central recess and a second fluid being intended for circulating around the outer periphery, a so-called inner tubular electrode rigidly connected to an inner surface of each thermoelectric element (1n, 1p), a so-called outer tubular electrode (6) rigidly connected to an outer surface of each thermoelectric element (1n, 1p), and fins (2) extending away from the outer surface of said thermoelectric element (1n, 1p) and perpendicular to the axis of the central recess thereof, each fin (2) comprising a central recess having an inner diameter only slightly larger than the outer diameter of said thermoelectric element (1n, 1p) and being inserted by force onto the outer surface of the outer electrode (6) of said thermoelectric element (1n, 1p).

Description

Module et dispositif thermo électriques, notamment destinés à générer un courant électrique dans un véhicule automobile  Thermoelectric module and device, in particular for generating an electric current in a motor vehicle
La présente invention se rapporte à un module et un dispositif thermo électriques, notamment destinés à générer un courant électrique dans un véhicule automobile. The present invention relates to a module and a thermoelectric device, in particular for generating an electric current in a motor vehicle.
Dans le domaine automobile, a déjà été proposé des dispositifs thermo électriques, également appelés générateurs thermo électriques ou TEG selon l'acronyme anglo-saxon « ThermoElectric Generator », utilisant des éléments, dits thermo électriques, permettant de générer un courant électrique en présence d'un gradient de température entre deux de leurs faces opposées selon le phénomène connu sous le nom d'effet Seebeck. Ces dispositifs comprennent un empilement de premiers tubes, destinés à la circulation des gaz d'échappement d'un moteur, et de seconds tubes, destinés à la circulation d'un fluide caloporteur d'un circuit de refroidissement. Les éléments thermo électriques sont pris en sandwich entre les tubes de façon à être soumis à un gradient de température provenant de la différence de température entre les gaz d'échappement, chauds, et le fluide de refroidissement, froid. In the automotive field, has already been proposed electric thermo devices, also called electric thermo generators or TEG according to the acronym "ThermoElectric Generator", using so-called electric thermo elements, to generate an electric current in the presence of a temperature gradient between two of their opposite faces according to the phenomenon known as the Seebeck effect. These devices comprise a stack of first tubes, intended for the circulation of the exhaust gases of an engine, and second tubes, intended for the circulation of a heat transfer fluid of a cooling circuit. The electrical thermo elements are sandwiched between the tubes so as to be subjected to a temperature gradient from the temperature difference between the hot exhaust gases and the cold cooling fluid.
Des tels dispositifs sont particulièrement intéressants car ils permettent de produire de l'électricité à partir d'une conversion de la chaleur provenant des gaz d'échappement du moteur. I ls offrent ainsi la possibilité de réduire la consommation en carburant du véhicule en venant se substituer, au moins partiellement, à l'alternateur habituellement prévu dans celui-ci pour générer de l'électricité à partir d'une courroie entraînée par le vilebrequin du moteur. II a déjà été développé par la demanderesse des éléments thermo électriques de forme annulaire dans lesquels le gradient de température permettant de générer le courant électrique est imposé entre deux de leurs faces cylindriques opposées, le fluide chaud et le fluide froid circulant coaxialement, l'un à l'intérieur de l'anneau et l'autre à l'extérieur. Ce type d'éléments thermo électriques présente des difficultés d'intégration qui entraînent l'engagement d'une quantité importante de matière grevant le coût de revient et augmentant l'inertie thermique du dispositif. Such devices are particularly interesting because they make it possible to produce electricity from a conversion of the heat coming from the exhaust gases of the engine. I ls thus offer the possibility of reducing the fuel consumption of the vehicle by replacing, at least partially, the alternator usually provided therein to generate electricity from a belt driven by the crankshaft of the vehicle. engine. It has already been developed by the Applicant ring-shaped thermoelectric elements in which the temperature gradient for generating the electric current is imposed between two of their opposite cylindrical faces, the hot fluid and the cold fluid circulating coaxially, one inside the ring and the other outside. This type of thermoelectric elements presents integration difficulties which lead to the commitment of a large amount of material burdening the cost and increasing the thermal inertia of the device.
Afin de remédier à ces inconvénients, la demanderesse a développé un module thermo électrique comportant des éléments thermo électriques de forme annulaire dans lesquels le premier fluide et le second fluide circulent de manière transversale l'un par rapport à l'autre. Un tel module thermo électrique est représenté sur la figure 1 et comporte une pluralité d'éléments thermo électriques 1 de forme annulaires disposés dans le prolongement longitudinal l'un de l'autre de façon coaxiale, avec par exemple une alternance d'éléments thermo électriques de type N et d'éléments thermo électriques de type P. Chaque élément thermo électrique 1 comporte des ailettes 2 s'étendant depuis la périphérie extérieure, transversalement et radialement. Ces ailettes 2 permettent de favoriser les échanges thermiques avec les gaz chauds 3 d'échappement qui circulent à travers lesdites ailettes 2, un fluide froid 4 circulant au centre des éléments thermo électriques 1 à travers un tube 5, et extraire le maximum de chaleur des gaz d'échappement pour la transférer aux matériaux thermo électriques. In order to overcome these drawbacks, the applicant has developed a thermoelectric module comprising annular-shaped thermoelectric elements in which the first fluid and the second fluid circulate transversely relative to one another. Such a thermoelectric module is shown in FIG. 1 and comprises a plurality of annular-shaped electric thermoelectric elements 1 arranged in the longitudinal extension of one another in a coaxial manner, with, for example, an alternation of electric thermoelectric elements. N-type and P type thermoelectric elements. Each thermoelectric element 1 comprises fins 2 extending from the outer periphery, transversely and radially. These fins 2 make it possible to promote heat exchanges with the exhaust hot gases 3 flowing through said fins 2, a cold fluid 4 flowing in the center of the electric thermoelectric elements 1 through a tube 5, and extracting the maximum heat from the heat sources. exhaust gas to transfer it to thermoelectric materials.
Pour canaliser les gaz chauds au travers des ailettes 2, on utilise usuellement une enveloppe cylindrique coiffant les ailettes 2 des éléments thermo électriques 1 qui sont assemblés sous la forme d'un crayon cylindrique 6, le crayon 6 d'éléments thermo électriques 1 étant inséré dans l'enveloppe cylindrique dont le diamètre interne est ajusté au diamètre externe des ailettes 2 qui présentent alors une forme circulaire. Afin de réaliser un générateur thermo électrique, plusieurs crayons 6 peuvent être assemblés ensemble, le nombre de crayons 6 dépendant de la puissance électrique souhaitée. Lesdites ailettes 2 sont usuellement usinées à partir d'un cylindre métallique de sorte qu'il n'est pas possible d'adapter les performances d'échange thermique, tel que l'espace entre deux ailettes adjacentes notamment, aux conditions dans lesquelles l'échangeur thermo électrique sera utilisé. Par ailleurs, l'usinage des ailettes est un procédé de fabrication particulièrement long et onéreux, ce qui grève le coût de fabrication de l'échangeur thermo électrique. In order to channel the hot gases through the fins 2, a cylindrical envelope covering the fins 2 of the electric thermoelectric elements 1 which are assembled in the form of a cylindrical pencil 6 is usually used, the pencil 6 of electric thermoelectric elements 1 being inserted in the cylindrical casing whose inner diameter is adjusted to the outer diameter of the fins 2 which then have a circular shape. In order to produce a thermoelectric generator, several rods 6 can be assembled together, the number of rods 6 depending on the desired electrical power. Said fins 2 are usually machined from a metal cylinder so that it is not possible to adapt the heat exchange performance, such as the space between two adjacent fins in particular, to the conditions in which the electric heat exchanger will be used. Moreover, machining fins is a particularly long and expensive manufacturing process, which strike the cost of manufacturing the heat exchanger.
L'invention se propose d'améliorer la situation et concerne à cet effet un module thermo électrique comprenant au moins une pluralité d'éléments thermo électriques cylindriques comprenant un évidement circulaire central, susceptibles de générer un courant électrique sous l'action d'un gradient de température exercé entre une première face dite extérieure définie par une surface de périphérie extérieure et une seconde face dite intérieure définie par une surface de périphérie intérieure, un premier fluide étant destiné à circuler à travers l'évidement central et un second fluide étant destiné à circuler autour de la périphérie extérieure, ledit module comprenant en outre une électrode tubulaire dite extérieure solidaire de la face extérieure de chaque élément thermo électrique, et des ailettes s'étendant depuis la face extérieure dudit élément thermo électrique, chaque ailette comportant un évidement central de diamètre interne tout juste supérieur au diamètre externe dudit élément thermo électrique et étant emmanché en force sur la face extérieure de l'électrode extérieure dudit élément thermo électrique. On comprend bien que les ailettes étant emmanchées en force sur la face extérieure de l'électrode extérieure des éléments thermo électriques, il est possible d'adapter le pas, i.e. l'espace, entre deux ailettes adjacentes en fonction des conditions dans lesquels l'échangeur thermo électrique sera utilisé. De plus, le procédé de fabrication des ailettes destinées à être emmanchées sur les éléments thermo électriques ainsi que leur montage sur lesdits éléments thermo électriques est moins onéreux que le procédé de l'art antérieur. Selon un aspect de l'invention, ledit module comprend en outre une électrode tubulaire dite intérieure solidaire de la face intérieure de chaque élément thermo électrique. The invention proposes to improve the situation and concerns for this purpose a thermoelectric module comprising at least a plurality of cylindrical thermoelectric elements comprising a central circular recess, capable of generating an electric current under the action of a gradient temperature exerted between a first outer face defined by an outer periphery surface and a second inner face defined by an inner periphery surface, a first fluid being adapted to flow through the central recess and a second fluid being adapted to circulating around the outer periphery, said module further comprising an outer tubular electrode integral with the outer face of each thermoelectric element, and fins extending from the outer face of said thermoelectric element, each fin having a central recess of internal diameter just greater than the outer diameter of said thermoelectric element and being force-fitted on the outer face of the outer electrode of said thermoelectric element. It is well understood that the fins being force-fitted on the outer face of the outer electrode of the electric thermoelectric elements, it is possible to adapt the pitch, ie the space, between two adjacent fins according to the conditions in which the electric heat exchanger will be used. In addition, the method of manufacturing fins to be fitted on the thermoelectric elements and their mounting on said thermoelectric elements is less expensive than the method of the prior art. According to one aspect of the invention, said module further comprises an inner tubular electrode integral with the inner face of each thermoelectric element.
Selon un aspect de l'invention, lesdites ailettes s'étendent perpendiculairement à l'axe de leur évidement central. According to one aspect of the invention, said fins extend perpendicularly to the axis of their central recess.
Selon un aspect de l'invention, la différence entre le diamètre externe dudit élément thermo électrique et le diamètre interne de chaque ailette est comprise entre 0.05 et 0.15 mm. According to one aspect of the invention, the difference between the outer diameter of said thermoelectric element and the inner diameter of each fin is between 0.05 and 0.15 mm.
De manière avantageuse, la différence entre le diamètre externe dudit élément thermo électrique et le diamètre interne de chaque ailette est de 0.1 mm. Advantageously, the difference between the outer diameter of said thermoelectric element and the internal diameter of each fin is 0.1 mm.
Selon un aspect de l'invention, les ailettes s'étendent parallèlement les unes par rapport aux autres. Selon un premier exemple de réalisation, les ailettes sont planes. According to one aspect of the invention, the fins extend parallel to each other. According to a first exemplary embodiment, the fins are flat.
Selon un second exemple de réalisation, les ailettes sont ondulées. Une telle forme ondulée des ailettes permet d'augmenter la convection entre les gaz chauds d'échappement et lesdites ailettes. According to a second exemplary embodiment, the fins are corrugated. Such an undulating form of the fins makes it possible to increase the convection between the hot exhaust gases and said fins.
Afin d'améliorer les performances des ailettes, c'est-à-dire la convection entre les gaz chauds d'échappement et les ailettes, lesdites ailettes présentent un état de surface rugueux. Selon un aspect de l'invention, lesdites ailettes présentent une forme de rondelle circulaire. Selon un exemple de réalisation, chaque ailette comprend un collet solidaire du bord intérieur desdites ailettes, ledit collet présentant une largeur supérieure à l'épaisseur de ladite ailette. Afin d'améliorer les performances desdites ailettes, chaque ailette comporte au moins un jour occulté par des persiennes. In order to improve the performance of the fins, that is to say the convection between the hot exhaust gases and the fins, said fins have a rough surface state. According to one aspect of the invention, said fins have a circular washer shape. According to an exemplary embodiment, each fin comprises a collar integral with the inner edge of said fins, said collar having a width greater than the thickness of said fin. To improve the performance of said fins, each fin has at least one day obscured by louvers.
L'invention concerne aussi un dispositif thermo électrique comprenant une pluralité de modules tels que décrits précédemment. The invention also relates to a thermoelectric device comprising a plurality of modules as described above.
Avantageusement, ledit dispositif est configuré pour être positionné dans un conduit de gaz d'échappement de véhicule automobile de sorte que lesdits gaz circulent entre les ailettes, lesdits gaz définissant le second fluide. L'invention sera mieux comprise à la lumière de la description suivante qui n'est donnée qu'à titre indicatif et qui n'a pas pour but de la limiter, accompagnée des dessins joints parmi lesquels : Advantageously, said device is configured to be positioned in a motor vehicle exhaust gas duct so that said gases circulate between the fins, said gases defining the second fluid. The invention will be better understood in the light of the following description which is given only as an indication and which is not intended to limit it, accompanied by the appended drawings among which:
la figure 1 est une représentation schématique en perspective d'un module thermo électrique de l'art antérieur,  FIG. 1 is a diagrammatic representation in perspective of a thermoelectric module of the prior art,
- la figure 2 est une vue en perspective de l'assemblage de deux éléments thermo électriques d'un module thermo électrique conforme à l'invention,  FIG. 2 is a perspective view of the assembly of two electric thermoelectric elements of a thermoelectric module according to the invention,
la figure 3 est une vue en perspective éclatée de l'assemblage de deux éléments thermo électriques et d'ailettes d'un module thermo électrique conforme à l'invention,  FIG. 3 is an exploded perspective view of the assembly of two thermoelectric elements and fins of a thermoelectric module according to the invention,
la figure 4 est une vue en perspective de deux éléments thermo électriques et d'ailettes assemblées d'un module thermo électrique conforme à l'invention,  FIG. 4 is a perspective view of two thermoelectric elements and assembled fins of a thermoelectric module according to the invention,
la figure 5 est une représentation schématique en coupe longitudinale d'un élément thermo électrique et des ailettes d'un module thermo électrique conforme à l'invention, la figure 6 est une représentation schématique en coupe longitudinale d'une ailette d'un module thermo électrique conforme à l'invention, FIG. 5 is a diagrammatic representation in longitudinal section of a thermoelectric element and fins of a thermoelectric module according to the invention, FIG. 6 is a diagrammatic representation in longitudinal section of a fin of a thermoelectric module according to the invention,
la figure 7 est une vue en perspective d'une variante d'exécution d'une ailette d'un module thermo électrique conforme à l'invention,  FIG. 7 is a perspective view of an alternative embodiment of a fin of a thermoelectric module according to the invention,
la figure 8 est une vue en perspective des persiennes de la variante d'exécution de l'ailette du module thermo électrique conforme à l'invention représentée à la figure 7.  FIG. 8 is a perspective view of the louvers of the variant embodiment of the fin of the thermoelectric module according to the invention shown in FIG. 7.
Sur les figures, les éléments identiques ou analogues portent les mêmes références. In the figures, identical or similar elements bear the same references.
Comme illustré à la figure 1, l'invention concerne un module thermo électrique, ledit module comprend un premier circuit 5 dit chaud apte à permettre la circulation d'un premier fluide, notamment des gaz d'échappement d'un moteur, et un second circuit 4 dit froid apte à permettre la circulation d'un second fluide, notamment un fluide caloporteur d'un circuit de refroidissement, de température inférieure à celle du premier fluide. Ledit second fluide présentant ainsi un coefficient d'échange thermique supérieur audit premier fluide. As illustrated in FIG. 1, the invention relates to a thermoelectric module, said module comprising a first so-called hot circuit capable of allowing the circulation of a first fluid, in particular the exhaust gases of an engine, and a second circuit 4 said cold adapted to allow the circulation of a second fluid, including a heat transfer fluid of a cooling circuit, lower temperature than the first fluid. Said second fluid thus having a heat exchange coefficient greater than said first fluid.
Ledit module comprend au moins un élément thermo électrique 1, ici une pluralité d'éléments thermo électriques Ιη,ΐρ, en forme de cylindre ou de prisme droit et présentant un évidement central, susceptible de générer un courant électrique sous l'action d'un gradient de température exercé entre une première face dite extérieure lia définie par une surface de périphérie extérieure et une seconde face dite intérieure 11b définie par une surface de périphérie intérieure, le second fluide étant destiné à circuler à travers l'évidement central dans un tube 5 et le premier fluide étant destiné à circuler autour de la périphérie extérieure. On notera que les faces extérieures lia et intérieures 11b des éléments thermo électriques 1 sont par exemple circulaires. Toutefois, de façon plus générale, toute section de forme arrondie, telle qu'une forme ovale par exemple, et/ou polygonale est possible. Said module comprises at least one thermoelectric element 1, here a plurality of thermoelectric elements Ιη, ΐρ, cylinder-shaped or straight prism and having a central recess, capable of generating an electric current under the action of a a temperature gradient exerted between a first outer face 11a defined by an outer periphery surface and a second inner face 11b defined by an inner periphery surface, the second fluid being adapted to flow through the central recess in a tube 5 and the first fluid being for circulating around the outer periphery. It will be noted that the outer 11a and inner faces 11b of the electric thermoelectric elements 1 are for example circular. However, more generally, any section of rounded shape, such as an oval shape for example, and / or polygonal is possible.
De tels éléments fonctionnent, selon l'effet Seebeck, en permettant de créer un courant électrique dans une charge connectée entre les faces intérieure 11b et extérieure lia des éléments thermo électriques Ιη,ΐρ soumises au gradient de température. De façon connue de l'homme du métier, de tels éléments sont constitués, par exemple, de Bismuth et de Tellurium (Bi2Te3). Such elements operate, according to the Seebeck effect, by making it possible to create an electric current in a load connected between the inner faces 11b and outer 11a of the electric thermo elements Ιη, ΐρ subjected to the temperature gradient. In a manner known to those skilled in the art, such elements consist, for example, of Bismuth and Tellurium (Bi 2 Te 3 ).
Les éléments thermo électriques pourront être, pour une première partie, des éléments lp d'un premier type, dit P, permettant d'établir une différence de potentiel électrique dans un sens, dit positif, lorsqu'ils sont soumis à un gradient de température donné, et, pour l'autre partie, des éléments ln d'un second type, dit N, permettant la création d'une différence de potentiel électrique dans un sens opposé, dit négatif, lorsqu'ils sont soumis au même gradient de température. The thermoelectric elements may be, for a first part, elements lp of a first type, said P, making it possible to establish a difference of electric potential in a direction, said positive, when they are subjected to a temperature gradient given, and, for the other part, elements ln of a second type, said N, allowing the creation of a difference of electric potential in an opposite direction, said negative, when they are subjected to the same temperature gradient .
A la figure 1, les éléments thermo électriques 1 représentés sont constitués d'un anneau en une seule pièce. Ils pourront cependant être formés de plusieurs pièces formant chacune une portion angulaire de l'anneau. In Figure 1, the electric thermo elements 1 shown consist of a ring in one piece. They may however be formed of several pieces each forming an angular portion of the ring.
La surface extérieure lia présente, par exemple, un rayon compris entre 1,5 et 4 fois le rayon de la surface intérieure 11b. Il pourra s'agir d'un rayon égal à environ 2 fois celui de la surface intérieure 11b. Ledit élément thermo électrique 1 présente, par exemple, deux faces planes parallèles opposées. Autrement dit, l'anneau constituant l'élément thermo électrique 1 est de section annulaire rectangulaire. Lesdits éléments thermo électriques lp, ln sont disposés, par exemple, dans le prolongement longitudinal l'un de l'autre, notamment de façon coaxiale, et les éléments thermo électriques de type P alternent avec les éléments thermo électriques de type N, selon une direction D. Ils sont, notamment, de forme et de dimension identiques. Ils pourront cependant présenter une épaisseur, c'est-à-dire une dimension entre leurs deux faces planes, différente d'un type à l'autre, notamment en fonction de leur conductivité électrique. The outer surface 11a has, for example, a radius of between 1.5 and 4 times the radius of the inner surface 11b. It may be a radius equal to about 2 times that of the inner surface 11b. Said thermoelectric element 1 has, for example, two opposite parallel flat faces. In other words, the ring constituting the thermoelectric element 1 is of rectangular annular section. Said thermoelectric elements lp, ln are arranged, for example, in the longitudinal extension of one another, in particular in a coaxial manner, and the P-type thermoelectric elements alternate with the N-type thermoelectric elements, according to a direction D. They are, in particular, of identical shape and size. They may, however, have a thickness, that is to say a dimension between their two planar faces, different from one type to another, particularly depending on their electrical conductivity.
Lesdits éléments thermo électriques lp, ln sont, par exemple, groupés par paire, chaque paire étant formée d'un dit élément thermo électrique de type P et d'un dit élément thermo électrique de type N, et ledit module est configuré pour permettre une circulation de courant entre les premières surfaces des éléments thermo électriques 1 d'une même paire et une circulation de courant entre les secondes surfaces de chacun des éléments thermo électriques 1 de ladite même paire et l'élément thermo électrique 1 voisin de la paire voisine. On assure de la sorte une circulation en série du courant électrique entre les éléments thermo électriques lp, ln disposés les uns à côtés des autres selon la direction D. Said thermoelectric elements lp, ln are, for example, grouped in pairs, each pair being formed of a said P type thermoelectric element and a said N type thermoelectric element, and said module is configured to allow a current flow between the first surfaces of the electric thermoelectric elements 1 of the same pair and a flow of current between the second surfaces of each of the electric thermoelectric elements 1 of the same pair and the thermoelectric element 1 adjacent to the neighboring pair. In this way, a series circulation of the electric current is ensured between the electric thermoelectric elements lp, ln arranged next to one another in the direction D.
Ledit module pourra comprendre en outre des moyens d'isolation électrique, non représentés sur les figures, disposés entre deux faces en vis-à- vis d'éléments thermo électriques voisins lp, ln selon la direction d'extension D longitudinale du tube 5. Said module may further comprise electrical insulation means, not shown in the figures, arranged between two faces vis-à-vis neighboring electric thermo elements lp, ln according to the longitudinal extension direction D of the tube 5.
En référence aux figures 2 à 6, Ledit module comprend des premiers moyens de connexion électrique 6 reliant les surfaces de périphérie extérieure lia de deux desdits éléments thermo électrique ln et lp, prévus adjacents et de types différents. Lesdits premiers moyens de connexion électrique consistent en une électrode tubulaire 6 dite extérieure solidaire de la face extérieure de chaque élément thermo électrique ln, lp, en cuivre permettant de braser deux éléments thermo électriques ln, lp contigus. Cette électrode tubulaire extérieure 6 présente une épaisseur comprise entre 0,1 et 0,3 mm pour des éléments thermo électriques Ιη,ΐρ présentant un diamètre externe compris entre 15 et 19 mm. With reference to FIGS. 2 to 6, said module comprises first electrical connection means 6 connecting the outer periphery surfaces 11a of two of said thermoelectric elements 11n and 1p, provided adjacent and of different types. Said first electrical connection means consist of a tubular electrode 6 said external integral with the outer face of each thermoelectric element ln, lp, copper allowing brazing two electric thermo elements ln, lp contiguous. This outer tubular electrode 6 has a thickness of between 0.1 and 0.3 mm for thermoelectric elements Ιη, ΐρ having an external diameter of between 15 and 19 mm.
On observera que l'électrode extérieure 6 pourra consister dans toute couche de matière électriquement conductrice, telle qu'une couche de Nickel par exemple sans sortir du cadre de l'invention. Par ailleurs, l'épaisseur de l'électrode extérieure 6 pourra aisément être déterminée par l'Homme du Métier et dépend, outre le matériau dans lequel elle est obtenue, du diamètre externe des éléments thermo électriques Ιη,ΐρ. It will be observed that the outer electrode 6 may consist of any layer of electrically conductive material, such as a nickel layer for example without departing from the scope of the invention. Furthermore, the thickness of the outer electrode 6 can easily be determined by the skilled person and depends, in addition to the material in which it is obtained, the outer diameter of the thermoelectric elements Ιη, ΐρ.
Ledit module comprend avantageusement des surfaces d'échange secondaire, en particulier des ailettes 2, avec le second fluide. On augmente de la sorte la surface d'échange entre les éléments thermo électriques 1 et ledit second fluide. Lesdites ailettes 2 sont disposées, par exemple, transversalement, en particulier radialement auxdits éléments thermo électriques 1. Elles sont ici positionnées parallèlement les unes aux autres avec un écartement permettant un bon échange de chaleur avec le second fluide tout en limitant les pertes de charges. Said module advantageously comprises secondary exchange surfaces, in particular fins 2, with the second fluid. In this way, the exchange surface between the electric thermoelectric elements 1 and said second fluid is increased. Said fins 2 are arranged, for example, transversely, in particular radially to said electric thermo elements 1. They are here positioned parallel to each other with a spacing allowing a good heat exchange with the second fluid while limiting the losses of charges.
Lesdites ailettes 2 pourront comprendre un revêtement catalytique pour assurer une conversion catalytique de composants toxiques du second fluide. Dans le cas de gaz d'échappement, ledit module pourra de la sorte équiper un pot catalytique en complément ou substitution des composants servant classiquement à la catalyse dans de tels équipements. Said fins 2 may comprise a catalytic coating to ensure a catalytic conversion of toxic components of the second fluid. In the case of exhaust gas, said module can in this way equip a catalytic converter in addition or substitution of the components conventionally used for catalysis in such equipment.
En référence aux figures 3 à 6, lesdites ailettes 2 sont constituées de rondelles circulaires comprenant un collet 7 solidaire du bord intérieur desdites rondelles, ledit collet 7 présentant une largeur supérieure à l'épaisseur de ladite ailette 2. On notera que les ailettes sont obtenues par exemple dans de l'aluminium et présentent une épaisseur d'environ 0,1 mm. Toutefois, lesdites ailettes pourront être obtenues dans tout autre matériau thermiquement conducteur tel que de l'acier inoxydable par exemple, l'épaisseur des ailettes étant alors aisément adaptable par l'Homme du métier. A cet égard, la conduction thermique de l'acier inoxydable étant plus faible que celle de l'aluminium, l'épaisseur d'ailettes 2 obtenues dans de l'acier inoxydable devrait être comprise entre 0,14 et 0,16 environ. With reference to FIGS. 3 to 6, said fins 2 consist of circular washers comprising a collar 7 integral with the inner edge of said washers, said collar 7 having a width greater than the thickness of said fin 2. It will be noted that the fins are obtained for example in aluminum and have a thickness of about 0.1 mm. However, said fins may be obtained in any other thermally conductive material such as stainless steel for example, the thickness of the fins being then easily adaptable by the skilled person. In this respect, the thermal conduction of stainless steel being lower than that of aluminum, the thickness of fins 2 obtained in stainless steel should be between 0.14 and 0.16 approximately.
Dans cet exemple de réalisation, les collets 7 des ailettes 2 s'étendent d'un seul côté desdites ailettes. Toutefois, il est bien évident que les collets 7 pourront s'étendre de part et d'autre des ailettes 2 sans pour autant sortir du cadre de l'invention. In this embodiment, the flanges 7 of the fins 2 extend from one side of said fins. However, it is obvious that the collars 7 may extend on either side of the fins 2 without departing from the scope of the invention.
Lesdites ailettes 2 sont fixées sur l'électrode extérieure 6 par sertissage. A cet effet, la différence entre le diamètre externe des électrodes extérieures 6 desdits éléments thermo électriques ln, lp et le diamètre interne de chaque ailette 2 est comprise entre 0.05 et 0.15 mm, pour des électrodes extérieures présentant un diamètre externe d'environ 17,4 mm, afin de permettre un emmanchement en force sur la face extérieure des électrodes extérieures 6 desdits éléments thermo électriques ln, lp. De préférence, la différence entre le diamètre externe des électrodes extérieures 6 desdits éléments thermo électriques ln, lp et le diamètre interne de chaque ailette 2 est de 0.1 mm. Said fins 2 are fixed on the outer electrode 6 by crimping. For this purpose, the difference between the outer diameter of the outer electrodes 6 of said electric thermo elements ln, lp and the inner diameter of each fin 2 is between 0.05 and 0.15 mm, for external electrodes having an outside diameter of about 17, 4 mm, to allow a force fit on the outer face of the outer electrodes 6 of said thermoelectric elements ln, lp. Preferably, the difference between the outer diameter of the outer electrodes 6 of said electric thermo elements ln, lp and the inner diameter of each fin 2 is 0.1 mm.
On observera que le pas entre deux ailettes 2 adjacentes est déterminé par la largeur des collets 7 desdites ailettes, la largeur desdits collets 7 pouvant être adaptée pour adapter le pas entre les ailettes 2 en fonction des conditions d'utilisation de l'échangeur thermo électrique. It will be observed that the pitch between two adjacent fins 2 is determined by the width of the flanges 7 of said fins, the width of said flanges 7 can be adapted to adapt the pitch between the fins 2 depending on the conditions of use of the heat exchanger .
Dans cet exemple de réalisation, les ailettes 2 sont planes et s'étendent parallèlement les unes par rapport aux autres ; toutefois, afin d'améliorer les performances des ailettes 2, c'est-à-dire la convection entre les gaz chauds d'échappement et les ailettes 2, lesdites ailettes 2 pourront être ondulées. In this embodiment, the fins 2 are flat and extend parallel to each other; however, in order to improve the performance of the fins 2, that is to say the convection between the hot exhaust gases and the fins 2, said fins 2 may be corrugated.
Accessoirement, lesdites ailettes 2 pourront présenter un état de surface rugueux, obtenu par un sablage par exemple, afin également d'améliorer l'efficacité desdites ailettes. Incidentally, said fins 2 may have a rough surface condition, obtained by sanding for example, also to improve the efficiency of said fins.
En référence aux figures 7 et 8, l'efficacité des ailettes pourra également être améliorée en prévoyant des jours 8 dans chaque ailette 2, lesdits jours 8 étant occultés par des persiennes 9. Dans cet exemple particulier de réalisation, chaque ailette 2 comporte 6 jours rectangulaires uniformément répartis autour de l'ailette et les persiennes 9 présentent également une forme rectangulaire, les lamelles 10 des persiennes 9 s'étendant transversalement. On observera que la forme et le nombre de jours 8 ainsi que la forme, le nombre et l'orientation des lamelles 10 pourront aisément être optimisés par l'homme du métier. With reference to FIGS. 7 and 8, the efficiency of the fins may also be improved by providing days 8 in each fin 2, said days 8 being obscured by louvers 9. In this particular embodiment, each fin 2 has 6 days Rectangulars evenly distributed around the fin and louvers 9 also have a rectangular shape, the slats 10 louvers 9 extending transversely. It will be appreciated that the shape and number of days 8 as well as the shape, number and orientation of the lamellae 10 can easily be optimized by those skilled in the art.
Accessoirement, on notera que le module pourra en outre comprendre des seconds moyens de connexion électrique, non représentés sur les figures, établissant une connexion électrique entre les surfaces de périphérie intérieure de deux desdits éléments thermo électrique 1, prévus adjacents, de types différents et non reliés par lesdits premiers moyens de connexion électrique. Lesdits seconds moyens de connexion électrique comprennent, par exemple, une électrode tubulaire dite intérieure, solidaire de la face intérieure de chaque élément thermo électrique. Incidentally, it will be noted that the module may furthermore comprise second electrical connection means, not shown in the figures, establishing an electrical connection between the inner periphery surfaces of two of said adjacent thermoelectric elements 1, of different types and not connected by said first electrical connection means. Said second electrical connection means comprise, for example, an inner tubular electrode, integral with the inner face of each thermoelectric element.
Autrement dit, lesdits premiers et seconds moyens de connexion électrique relient deux à deux lesdits éléments thermo électriques 1 de façon à établir une circulation électrique en série entre lesdits éléments thermo électrique 1 du module. Il est bien entendu que la présente invention n'est en aucune façon limitée aux formes de réalisations décrites ci-dessus et que bien des modifications peuvent y être apportées sans sortir du cadre des revendications annexées. In other words, said first and second electrical connection means connect in pairs said electric thermoelectric elements 1 so as to establish an electrical circulation in series between said thermoelectric elements 1 of the module. It is understood that the present invention is in no way limited to the embodiments described above and that many modifications can be made without departing from the scope of the appended claims.

Claims

REVENDICATIONS
1. Module thermo électrique comprenant au moins une pluralité d'éléments thermo électriques (Ιη,ΐρ) cylindriques comprenant un évidement circulaire central, susceptibles de générer un courant électrique sous l'action d'un gradient de température exercé entre une première face dite extérieure définie par une surface de périphérie extérieure (lia) et une seconde face dite intérieure définie par une surface de périphérie intérieure (11b), un premier fluide étant destiné à circuler à travers l'évidement central et un second fluide étant destiné à circuler autour de la périphérie extérieure, ledit module comprenant en outre une électrode tubulaire dite extérieure (6) solidaire de la face extérieure de chaque élément thermo électrique (Ιη,ΐρ), et des ailettes (2) s'étendant depuis la face extérieure dudit élément thermo électrique (Ιη,ΐρ), chaque ailette (2) comportant un évidement central de diamètre interne tout juste supérieur au diamètre externe dudit élément thermo électrique (Ιη,ΐρ) et étant emmanché en force sur la face extérieure de l'électrode extérieure (6) dudit élément thermo électrique (Ιη,ΐρ). 1. Thermoelectric module comprising at least a plurality of cylindrical thermoelectric elements (Ιη, ΐρ) comprising a central circular recess, capable of generating an electric current under the action of a temperature gradient exerted between a first so-called outer face defined by an outer periphery surface (11a) and a second inner so-called face defined by an inner periphery surface (11b), a first fluid being adapted to flow through the central recess and a second fluid being adapted to circulate around the outer periphery, said module further comprising an outer tubular electrode (6) integral with the outer face of each thermoelectric element (Ιη, ΐρ), and fins (2) extending from the outer face of said thermoelectric element (Ιη, ΐρ), each fin (2) having a central recess of internal diameter just greater than outer diameter of said thermoelectric element (Ιη, ΐρ) and being force-fitted on the outer face of the outer electrode (6) of said thermoelectric element (Ιη, ΐρ).
2. Module selon la revendication 1 dans lequel la différence entre le diamètre externe de l'électrode extérieure (6) dudit élément thermo électrique (Ιη,ΐρ) et le diamètre interne de chaque ailette (2) est comprise entre 0.05 et 0.15 mm. 2. Module according to claim 1 wherein the difference between the outer diameter of the outer electrode (6) of said thermoelectric element (Ιη, ΐρ) and the inner diameter of each fin (2) is between 0.05 and 0.15 mm.
3. Module selon la revendication 2 dans lequel la différence entre le diamètre externe de l'électrode extérieure (6) dudit élément thermo électrique (Ιη,ΐρ) et le diamètre interne de chaque ailette (2) est de 0.1 mm. 3. Module according to claim 2 wherein the difference between the outer diameter of the outer electrode (6) of said thermoelectric element (Ιη, ΐρ) and the inner diameter of each fin (2) is 0.1 mm.
4. Module selon l'une quelconque des revendications 1 à 3 dans lequel les ailettes (2) s'étendent parallèlement les unes par rapport aux autres. 4. Module according to any one of claims 1 to 3 wherein the fins (2) extend parallel to each other.
5. Module selon l'une quelconque des revendications 1 à 4 dans lequel les ailettes (2) sont planes. 5. Module according to any one of claims 1 to 4 wherein the fins (2) are planar.
6. Module selon l'une quelconque des revendications 1 à 4 dans lequel les ailettes (2) sont ondulées. 6. Module according to any one of claims 1 to 4 wherein the fins (2) are corrugated.
7. Module selon l'une quelconque des revendications 1 à 6 dans lequel les ailettes (2) présentent un état de surface rugueux. 7. Module according to any one of claims 1 to 6 wherein the fins (2) have a rough surface condition.
8. Module selon l'une quelconque des revendications 1 à 7 dans lequel les ailettes (2) présentent une forme de rondelle circulaire. 8. Module according to any one of claims 1 to 7 wherein the fins (2) have a circular washer shape.
9. Module selon l'une quelconque des revendications 1 à 8 dans lequel chaque ailette (2) comprend un collet (7) solidaire du bord intérieur desdites ailettes (2), ledit collet (7) présentant une largeur supérieure à l'épaisseur de ladite ailette (2). 9. Module according to any one of claims 1 to 8 wherein each fin (2) comprises a collar (7) integral with the inner edge of said fins (2), said collar (7) having a width greater than the thickness of said fin (2).
10. Module selon l'une quelconque des revendications 1 à 9 dans lequel chaque ailette (2) comporte au moins un jour (8) occulté par des persiennes (9). 10. Module according to any one of claims 1 to 9 wherein each fin (2) comprises at least one day (8) obscured by louvers (9).
11. Dispositif thermo électrique comprenant au moins un module selon l'une quelconque des revendications 1 à 10 précédentes. 11. Thermoelectric device comprising at least one module according to any one of claims 1 to 10 above.
12. Dispositif thermo électrique selon la revendication 11 configuré pour être positionné dans un conduit de gaz d'échappement de véhicule automobile de sorte que lesdits gaz circulent entre les ailettes (2), lesdits gaz définissant le second fluide. 12. Thermoelectric device according to claim 11 configured to be positioned in a motor vehicle exhaust gas duct so that said gases circulate between the fins (2), said gases defining the second fluid.
PCT/FR2016/052257 2015-09-15 2016-09-09 Thermoelectric module and device, in particular for generating an electric current in a motor vehicle WO2017046484A1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030102554A1 (en) * 2001-10-11 2003-06-05 Rencai Chu Thermoelectric module
US20130255739A1 (en) * 2011-06-06 2013-10-03 Gentherm, Inc. Passively cooled thermoelectric generator cartridge
FR3000614A1 (en) * 2012-12-28 2014-07-04 Valeo Systemes Thermiques THERMO ELECTRIC MODULE AND DEVICE, ESPECIALLY FOR GENERATING AN ELECTRICAL CURRENT IN A MOTOR VEHICLE

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030102554A1 (en) * 2001-10-11 2003-06-05 Rencai Chu Thermoelectric module
US20130255739A1 (en) * 2011-06-06 2013-10-03 Gentherm, Inc. Passively cooled thermoelectric generator cartridge
FR3000614A1 (en) * 2012-12-28 2014-07-04 Valeo Systemes Thermiques THERMO ELECTRIC MODULE AND DEVICE, ESPECIALLY FOR GENERATING AN ELECTRICAL CURRENT IN A MOTOR VEHICLE

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