DE102022118936A1 - Plate stack for a humidification device, carrier plates and humidification device - Google Patents

Abstract

The invention relates to a plate stack (400) for a humidification device (1000), in particular for a fuel cell system, with a plurality of first and second carrier plates (100, 200) which alternately follow one another in a stacking direction (500), each of which has a circumferential frame (120 , 220), which encloses a through opening (130, 230), wherein in the plate stack (400) at least first and second groups of flow channels (410, 420) which are designed to allow flow to flow transversely to one another are formed, which are formed by semi-permeable layers (110, 210), in particular moisture-permeable layers (110, 210), are separated, with three of the alternating first and second carrier plates (100, 200) forming two of the flow channels (410, 420) designed to allow flow to flow transversely to one another, and wherein the first and / or second carrier plates (100, 200) have a grid-like support element (300). The invention further relates to a support plate (100, 200) for a stack of plates (400), and a humidification device (1000) for a fuel cell system with a stack of plates (400).

Description

Technical area

The invention relates to a plate stack for a humidification device, in particular for a fuel cell system, carrier plates for a plate stack and a humidification device for a fuel cell system with a plate stack.

State of the art

The DE 10 2013 020 503 A1 discloses a humidification device which is used to enrich flow air, which is supplied, for example, to a fuel cell for the electrochemical reaction, with a defined moisture content. The humidification device has a stacking unit with a plurality of membranes arranged one above the other, preferably parallel and spaced apart from one another, each of which is permeable to water, but not to air, with air streams with different levels of moisture content being guided along the opposite sides of the membrane, so that water flows through the membrane - or water vapor exchange takes place from the air flow with a higher moisture content to the air flow with a lower moisture content. The humidification device has the stacking unit in a housing with water vapor-permeable membranes, which are arranged between frame parts. The housing has domes for holding the stacking unit, with the connection between domes and the frame parts taking place via laterally projecting connecting lugs which protrude into a receiving groove.

Disclosure of the invention

One object of the invention is to provide a plate stack for a humidification device, in particular for a fuel cell system, with improved mass transfer.

Another task is to provide carrier plates for a stack of plates for a humidification device with improved mass transfer.

Another task is to provide a humidification device for a fuel cell system with a plate stack with improved mass transfer.

The aforementioned object is achieved according to one aspect of the invention by a plate stack for a humidification device, in particular for a fuel cell system, with a plurality of first and second carrier plates alternating in a stacking direction, each of which comprises a circumferential frame which encloses a through opening, wherein In the plate stack, at least first and second groups of flow channels designed to allow flow to flow transversely to one another are formed, which are separated by semi-permeable layers, in particular moisture-permeable layers, with three of the alternating first and second carrier plates each forming two of the flow channels designed to allow flow to flow transversely to one another, and wherein the first and / or second support plates have a grid-like support element.

The further object is achieved according to a further aspect of the invention by carrier plates for a plate stack for a humidification device, in particular for a fuel cell system, comprising a circumferential frame which encloses a through opening and has a support surface on the frame for a semi-permeable layer which spans the opening and completely covers, the semi-permeable layer being arranged on an underside of the frame, based on a intended stacking direction in the plate stack.

The further object is achieved according to a further aspect of the invention by a humidification device for a fuel cell system, with a housing which has at least one inlet for a first fluid, in particular an exhaust gas of the fuel cell system, an inlet for a second fluid, in particular a supply air of the fuel cell system, has an outlet for the first fluid and an outlet for the second fluid, with a plate stack according to one of claims 1 to 9, in which a plurality of first and second carrier plates are arranged alternatingly successive in a stacking direction, with three of the alternatingly successive first and second carrier plates being arranged second carrier plates form a first and a second group of flow channels designed to be flowable transversely to one another, the first group of flow channels being arranged between the inlet and the outlet for the first fluid and the second group of flow channels being arranged between the inlet and the outlet for the second fluid.

Favorable refinements and advantages of the invention result from the further claims, the description and the drawing.

According to one aspect of the invention, a plate stack for a humidification device, in particular for a fuel cell system, is proposed with a plurality of first and second carrier plates alternating in a stacking direction, each of which comprises a circumferential frame that encloses a through opening. At least there are in the stack of records first and second groups of flow channels designed to allow flow to flow transversely to one another, which are separated by semi-permeable layers, in particular moisture-permeable layers. Three of the alternating first and second carrier plates each form two of the flow channels designed to allow flow to flow transversely to one another. The first and/or second carrier plates have a grid-like support element.

The proposed plate stack is advantageously suitable for a flat membrane humidifier. The flow channels, for example exhaust duct and supply air duct, are each formed by means of two different carrier plates and are used for the flow of moisture-contaminated exhaust gas in the exhaust duct, for example from a fuel cell, and in the neighboring flow duct with dry supply air for the fuel cell. The supply air can be humidified by moisture from the exhaust gas through the semi-permeable charger.

The semi-permeable layer thus separates the exhaust gas flow channel from the supply air flow channel. The semi-permeable layer can be designed, for example, as a PFSA (perfluorosulfonic acid) membrane, also known as a Nafion membrane. Such membranes are also commonly used as proton exchange membranes. The membrane is airtight but permeable to moisture. The semi-permeable layer can preferably be glued to the frame of the carrier plate.

Separate grid-like support elements in the form of flow grids are inserted between the carrier plates. The fluid flow therefore flows in a “zigzag” through the cross-rib structure of the flow grid. Through this targeted flow influence, a better mass transfer, in particular a better moisture transfer, from the moist exhaust gas to the dry supply air can be achieved and the performance of the humidification device can thereby be increased. The type of grid, in particular the height of the struts that form the grid, the crossing angle of the struts, the distance between the struts (“thread spacing”), can be used to specifically influence the material transfer and the pressure loss.

The grid on the exhaust side also serves as a spacer for the semi-permeable layers, which are designed as membranes, and prevents the flow channel from collapsing due to a differential pressure between the exhaust gas and the supply air, which is pressed into the associated flow channel at higher pressure. The differential pressure between supply air and exhaust gas can usually be in the range of 300 mbar to 600 mbar and even be up to 1 bar. Such a humidification device is particularly advantageously suitable for a fuel cell system.

Alternatively, the grid-like support element can also be provided in both flow channels for the exhaust gas and supply air flow. This allows an even improved mass transfer to be achieved. In addition, the semi-permeable layers are even better supported and held in their position.

The grid-like support element can preferably be made of plastic, for example PA6.6 (polyamide), PPA (polyphthalamide), PPS (polyphenylene sulfide), or TPX (polymethylpentene).

According to a favorable embodiment of the plate stack, the semi-permeable layer, based on the stacking direction, can be arranged on an underside of the support plates for the first or second support plates and on an upper side of the support plates for the second or first support plates. As a result, the grid-like support element in the exhaust gas flow channel can advantageously stabilize the semi-permeable layer against the excess pressure of the supply air.

According to a favorable embodiment of the plate stack, the grid-like support element can be placed on the respective first and/or second support plate, in particular glued to the frame. Typically, the grid-like support element is an insert part during the production of the carrier plate. In this way, a stable and permanent attachment of the grid-like support element can be achieved.

According to a favorable design of the plate stack, the grid-like support elements on the first support plates can be designed differently than those on the second support plates. In particular, the grid-like support elements can differ in height and/or thread spacing and/or crossing angle. A height of the grid-like support element can be predetermined by the distance between the support plates when stacking. The thread spacing can be variable. The crossing angle of the threads can typically be 90°, but also, for example, 60° or have a different value. Such a variation in the design of the grid-like support elements can significantly influence the flow conditions of the corresponding flow channel and thus have a significant influence on the mass transfer, the moisture transfer, from the exhaust gas to the supply air and the associated pressure loss. This can be adjusted to suit intended operating conditions.

According to a favorable embodiment of the plate stack, the frame of the respective first carrier plate can have first end faces with one or more beads and first longitudinal sides with a connecting area, the end faces specifying inflow and/or outflow areas of the first group of flow channels. The frame of the respective second support plate can have second end faces with a connection area and second long sides with one or more beads, the long sides specifying inflow and/or outflow areas of the second group of flow channels. In this way, the first and second carrier plates can be alternately stacked tightly and thereby form flow channels arranged transversely to one another. Using the beads, an adhesive gap between the carrier plates stacked on top of each other can be constantly adjusted. A bead on the supply air side, for example the second carrier plate, can be in the range 1.2 mm to 1.4 mm, for example, a bead on the exhaust side, for example the first carrier plate, can be in the range 0.4 mm to 0.6 mm, for example lay. As a result, a carrier plate can advantageously be made thin.

According to a favorable embodiment of the plate stack, the first end faces can have at least one spacer element for spacing the second end faces of the following second carrier plate. In particular, the beads and the spacer elements on the first end faces can extend in opposite directions away from the first support plate with respect to the stacking direction. This means that the inflow and outflow area for the exhaust gas can be kept open in a cost-effective manner, even at higher supply air pressure.

According to a favorable embodiment of the plate stack, the second end faces in the connection area can have bead receptacles for receiving beads of the first end faces of the adjacent first support plate, and the first longitudinal sides can have bead receptacles in the connection area for receiving beads of the following second support plate. In this way, the first and second carrier plates can be alternately stacked tightly and thereby form flow channels arranged transversely to one another.

According to a favorable embodiment of the plate stack, successive first and second carrier plates can be connected to one another in a fluid-tight manner except for inflow or outflow areas, in particular on the frame of the carrier plates, they can be connected to one another, in particular they can be glued to one another. As a result, side areas of the flow channels can be securely sealed so that no leaks can arise for the flowing fluid streams.

Advantageously, the connection area of the second carrier plate with the underside of the bead of the first carrier plate can laterally limit the first channel. Likewise, the connection area of the first carrier plate with the underside of the bead of the second carrier plate can laterally limit the second channel.

According to a favorable embodiment of the plate stack, at least one receptacle for an axial or radial seal can be arranged on an outside of the plate stack. In particular, the frames of the successive carrier plates can have incisions through which the receptacle is formed. By means of such a seal, the plate stack can advantageously be arranged in the housing of a humidification device in such a way that no cross leakage, i.e. a leakage between the two fluid streams, can occur. This allows efficient humidification of the supply air to be achieved by transferring moisture from the exhaust gas flow.

According to a further aspect of the invention, a support plate for a plate stack for a humidification device, in particular for a fuel cell system, is proposed, comprising a circumferential frame which encloses a through opening and has a support surface on the frame for a semi-permeable layer which spans the opening and completely covers it . The semi-permeable layer is arranged on an underside of the frame in relation to the intended stacking direction in the plate stack.

The proposed carrier plate advantageously serves as the first of two designs of carrier plates for building a plate stack, which is advantageously suitable for a flat membrane humidifier. The flow channels (exhaust gas and supply air channel) are formed by means of two different carrier plates and are used for the flow of moisture-contaminated exhaust gas, for example from a fuel cell, and in the neighboring flow channel for dry supply air. The supply air can be humidified by moisture from the exhaust gas through the semi-permeable charger.

The semi-permeable layer thus separates the exhaust gas flow channel from the supply air flow channel. The semi-permeable layer can be designed, for example, as a PFSA (perfluorosulfonic acid) membrane. Such membranes are also commonly used as proton exchange membranes. The membrane is airtight but permeable to moisture. The semi-permeable layer can preferably be glued to the frame of the carrier plate.

According to a favorable embodiment of the carrier plate, the frame can have first end faces with one or more beads and first longitudinal sides with a connection area with receiving boundaries for beads of a carrier plate that is intended to be adjacent in the plate stack, the end faces specifying inflow and / or outflow areas. Using the beads, an adhesive gap between the carrier plates stacked on top of each other can be constantly adjusted. A bead on the supply air side, for example the second carrier plate, can be in the range 1.2 mm to 1.4 mm, for example, a bead on the exhaust side, for example the first carrier plate, can be in the range 0.4 mm to 0.6 mm, for example lay

According to a further aspect of the invention, a support plate for a plate stack for a humidification device, in particular for a fuel cell system, is proposed, comprising a circumferential frame which encloses a through opening and has a support surface on the frame for a semi-permeable layer which spans the opening and completely covers it , wherein the semi-permeable layer is arranged on an upper side of the frame in relation to an intended stacking direction in the plate stack.

The proposed carrier plate advantageously serves as the second of two designs of carrier plates for building a plate stack, which is advantageously suitable for a flat membrane humidifier. The flow channels (exhaust gas and supply air channel) are formed by means of two different carrier plates and are used for the flow of moisture-contaminated exhaust gas, for example from a fuel cell, and in the neighboring flow channel for dry supply air. The supply air can be humidified by moisture from the exhaust gas through the semi-permeable charger.

The semi-permeable layer thus separates the exhaust gas flow channel from the supply air flow channel. The semi-permeable layer can be designed, for example, as a PFSA (perfluorosulfonic acid) membrane. Such membranes are also commonly used as proton exchange membranes. The membrane is airtight but permeable to moisture. The semi-permeable layer can preferably be glued to the frame of the carrier plate.

According to a favorable embodiment of the carrier plate, the frame can have second end faces with a connection area with receiving boundaries for beads of a carrier plate that is intended to be adjacent in the plate stack, as well as second long sides with one or more beads, the long sides specifying inflow and / or outflow areas. In this way, the first and second carrier plates can be alternately stacked tightly and thereby form flow channels arranged transversely to one another.

The frame of the carrier plate can advantageously be made of sheet metal or plastic film. In this way it is possible to produce a frame that is as thin as possible and yet stable. This allows a compact stack of plates to be constructed which at the same time meets the stability requirements during operation of the humidification device. A thickness of the frame can typically be in the range 0.3 mm.

At least one frame element can advantageously have an incision pointing outwards from a long side. As a result, the frames of the successive carrier plates can form a receptacle for a seal, which seals an end face of the plate stack all around. By means of such a seal, the plate stack can advantageously be arranged in the housing of a humidification device in such a way that there is no cross leakage, i.e. a leakage between the two fluid streams. This allows efficient humidification of the supply air to be achieved by transferring moisture from the exhaust gas flow.

According to a favorable design of the carrier plate, the connection area can have at least one adhesive surface. Alternatively or additionally, the recording limitation can act as a spacer for the frame of a carrier plate that is intended to be adjacent in the plate stack. The stacked carrier plates can be securely connected by gluing and form tight flow channels. The spacers allow the inflow and outflow areas of the flow channels to be kept open, even if the adjacent flow channels have higher pressures.

Advantageously, the first end faces can have at least one spacer element for spacing the second end faces of the following second carrier plate. In particular, the beads and the spacer elements on the first end faces can extend in opposite directions away from the first support plate with respect to the stacking direction. This means that the inflow and outflow area for the exhaust gas can be kept open in a cost-effective manner, even at higher supply air pressure.

A channel arrangement of the plate stack can advantageously be formed from two different carrier plates, with the two carrier plates being arranged one above the other in the stacking direction. A flow channel is formed between the plates. The first frame elements of the first support plate are opposite the second ones Frame elements of the second support plate are arranged and the second frame elements of the first support plate are arranged opposite to first frame elements of the second support plate.

The frame tops with the layer tops of the corresponding semi-permeable layer delimit a flow channel running above the respective carrier plate downwards and frame bottoms with the layer undersides of the corresponding semi-permeable layer delimit a channel running below the respective carrier plate upwards.

The connection areas with the corresponding curved bulge of the bead laterally limit the flow channel running between the support plates and seal the flow channel laterally. A cross section of the first carrier plate is designed to be congruent with a cross section of the second carrier plate.

The height of the flow channels depends on the dimensions of the connection areas and/or on the dimensions of the spacer elements, which determine the distance between the support plates arranged one above the other.

According to a further aspect of the invention, a humidification device is proposed for a fuel cell system, with a housing which has at least one inlet for a first fluid, in particular an exhaust gas of the fuel cell system, an inlet for a second fluid, in particular a supply air of the fuel cell system, an outlet for the first fluid and an outlet for the second fluid, with a plate stack in which a plurality of first and second carrier plates alternating in a stacking direction are arranged. Three of the alternating first and second carrier plates each form a first and a second group of flow channels designed to allow flow to pass through one another. The first group of flow channels are arranged between the inlet and the outlet for the first fluid and the second group of flow channels are arranged between the inlet and the outlet for the second fluid.

The humidification device represents a special embodiment of a flat membrane humidifier. A first, moist or water-rich fluid, for example exhaust gas from fuel cells, flows in one group of flow channels, while a second, dry fluid, for example supply air for the fuel cells, flows in another group of flow channels. The second, dry fluid can be moistened by the first fluid via the semipermeable membranes.

The plate stack with the carrier plates can, for example, be axially sealed in a floating manner in the housing via two axially acting seals located at the ends on the inlet side and outlet side of the first or second fluid. These seals can seal either the supply air or the exhaust gas area. The exhaust gas area is preferably sealed.

The carrier plates of the plate stack can be designed, for example, as stainless steel plates or as plastic plates, for example made of PPS (polypropylene sulfide). A thickness of the carrier plate can be in the range of 0.3 mm, for example.

The housing of the humidification device can be made of metal, for example aluminum. Alternatively, it is also possible for the housing to be made of plastic, for example PPS, PPA (polyphthalamide), PA (polyamide).

The housing can be designed in several parts with a removable cover. In this way, the stack of plates can be removed from the housing and/or replaced for maintenance purposes.

Brief description of the drawings

Further advantages result from the following drawing description. An exemplary embodiment of the invention is shown in the drawings. The drawings, description and claims contain numerous features in combination. The person skilled in the art will also expediently consider the features individually and combine them into further sensible combinations.

• 1 eine erste Trägerplatte für einen Plattenstapel für eine Befeuchtungseinrichtung, insbesondere für ein Brennstoffzellensystem, nach einem Ausführungsbeispiel der Erfindung in isometrischer Darstellung;
• 2 eine zweite Trägerplatte nach einem Ausführungsbeispiel der Erfindung in isometrischer Darstellung;
• 3 die erste Trägerplatte nach 1 mit einem darüber angeordneten gitterartigen Abstützelement nach einem Ausführungsbeispiel der Erfindung;
• 4 die zweite Trägerplatte nach 2 mit einem darüber angeordneten gitterartigen Abstützelement nach einem Ausführungsbeispiel der Erfindung;
• 5 drei alternierend aufeinander gestapelte Trägerplatten nach einem Ausführungsbeispiel der Erfindung, welche einen ersten und einen zweiten Strömungskanal ausbilden;
• 6 einen Längsschnitt durch drei alternierend aufeinander gestapelte Trägerplatten mit einer transparent dargestellten oberen semipermeablen Lage;
• 7 einen Längsschnitt durch die drei Trägerplatten nach 6 mit der intransparent dargestellten oberen semipermeablen Lage;
• 8 einen Plattenstapel nach einem Ausführungsbeispiel der Erfindung im Aufbau in isometrischer Darstellung;
• 9 einen Plattenstapel nach einem Ausführungsbeispiel der Erfindung in isometrischer Darstellung; und
• 10 eine Befeuchtungseinrichtung, insbesondere für ein Brennstoffzellensystem, nach einem Ausführungsbeispiel der Erfindung in isometrischer Darstellung.

They show, for example:

• 1 a first carrier plate for a plate stack for a humidification device, in particular for a fuel cell system, according to an exemplary embodiment of the invention in an isometric view;
• 2 a second carrier plate according to an embodiment of the invention in an isometric view;
• 3 the first carrier plate 1 with a grid-like support element arranged above it according to an embodiment of the invention;
• 4 the second carrier plate 2 with a grid-like support element arranged above it according to an embodiment of the invention;
• 5 three carrier plates stacked alternately on top of one another according to an exemplary embodiment of the invention, which form a first and a second flow channel;
• 6 a longitudinal section through three carrier plates stacked alternately on top of each other with an upper semi-permeable layer shown transparently;
• 7 a longitudinal section through the three support plates 6 with the upper semi-permeable layer shown in a non-transparent manner;
• 8th a stack of plates according to an exemplary embodiment of the invention in construction in an isometric view;
• 9 a stack of plates according to an embodiment of the invention in an isometric view; and
• 10 a humidification device, in particular for a fuel cell system, according to an embodiment of the invention in an isometric view.

Embodiments of the invention

In the figures, identical or similar components are numbered with the same reference numerals. The figures only show examples and are not to be understood as limiting.

1 shows a first carrier plate 100 for a plate stack 400 for a humidification device 1000 ( 10 ), in particular for a fuel cell system, according to an exemplary embodiment of the invention in an isometric view.

The carrier plate 100 comprises a circumferential frame 120, which encloses a through opening 130 and on the frame 120 a support surface 128 for a semi-permeable layer 110 ( 5 ), which spans the opening 130 and completely covers it. In 1 only the frame 120 is shown without a semi-permeable layer.

The frame 120 has first end faces 122 with one or more beads 160 and first longitudinal sides 124 with a connection area 150 with receiving boundaries 154 for beads 260 of a carrier plate 200 which is intended to be adjacent in the plate stack 400 ( 2 ) on. The end faces 122 specify inflow and/or outflow areas for a fluid flow.

The first end faces 122 also have at least one spacer element 140 for spacing the second end faces 222 of the second carrier plate 200 following in the stacking direction 500. In particular, the beads 160 and the spacer elements 140 on the first end faces 122 extend in opposite directions away from the first carrier plate 100 with respect to the stacking direction 500.

2 shows a second carrier plate 200 according to an embodiment of the invention in an isometric view.

The carrier plate 200 also includes a circumferential frame 220, which encloses a through opening 230 and on the frame 220 a support surface 228 for a semi-permeable layer 210 ( 7 ), which spans the opening 230 and completely covers it.

The frame 220 has second end faces 222 with a connection area 250 with receiving boundaries 254 for beads 160 of a carrier plate 100 that is intended to be adjacent in the plate stack 400 and second longitudinal sides 224 with one or more beads 260. The long sides 224 specify inflow and/or outflow areas for a fluid flow.

The frame 120, 220 can be made, for example, from sheet metal or plastic film.

The frame 120, 220 has an incision 170, 270 pointing outwards from the long side 124, 224, which, when the carrier plates 100, 200 are stacked on one another, has a receptacle 432 for a seal 430 of the plate stack 400 (see 9 ).

The connection area 150, 250 of the carrier plates 100, 200 can have at least one adhesive surface in order to firmly connect carrier plates 100, 200 stacked on top of each other.

The recording limitation 154, 254 acts as a spacer to the frame 120, 220 of a carrier plate 100, 200 which is intended to be adjacent in the plate stack 400.

The frame 120 of the respective first carrier plate 100 has first end faces 122 with one or more beads 160 and first longitudinal sides 124 with a connecting region 150. The end faces 122 specify inflow and/or outflow areas of the first group of flow channels 410.

The frame 220 of the respective second carrier plate 200 has second end faces 222 with a connecting region 250 and second longitudinal sides 224 with one or more beads 260. The long sides 224 specify inflow and/or outflow areas of the second group of flow channels 420.

The second end faces 222 have bead receptacles 252 in the connection area 250 for receiving beads 160 of the first end faces 122 of the adjacent first carrier plate 100. The first longitudinal sides 124 have bead receptacles 152 in the connection area 150 for receiving beads 260 of the following second carrier plate 200.

3 shows the first carrier plate 100 1 with a grid-like support element 310 arranged above it according to an embodiment of the invention, while in 4 the second carrier plate 200 after 2 with a grid-like support element 320 arranged above it is shown according to an exemplary embodiment of the invention.

The grid-like support element 300, 310, 320 is placed on the respective first and/or second support plate 100, 200, and can in particular be glued to the frame 120, 220.

The grid-like support elements 300 on the first support plates 100 can be designed differently than those on the second support plates 200. In particular, the grid-like support elements 300 can differ in height and/or thread spacing and/or crossing angle.

In 5 3, three alternatingly stacked carrier plates 100, 200, 100 are shown according to an exemplary embodiment of the invention, which form first flow channels 410 and second flow channels 420.

Successive first and second carrier plates 100, 200 are connected to one another in a fluid-tight manner except for inflow or outflow areas. In particular, the carrier plates 100, 200 are connected to one another on the frames 120, 220. In particular, the carrier plates 100, 200 can be glued to one another on the frames 120, 220.

A first flow channel 410 for a second fluid stream 602, in particular supply air of a fuel cell, runs between a first and a second support plate 100, 200, or above the first support plate 100 located above. A second flow channel 420 for a first fluid flow 600, in particular exhaust gas Fuel cell, runs below the lower first carrier plate 100 and the second carrier plate 200 and the upper first carrier plate 100.

In the exemplary embodiment shown, the connection region 250 of the second support plate 200 with the underside of the bead 160 of the first support plate 100 delimits the first flow channel 410 laterally, i.e. transversely to the direction of flow. The connection area 150 of the first carrier plate 100 delimits the second flow channel 420 laterally with the underside of the bead 260 of the second carrier plate 200.

6 shows a longitudinal section through three carrier plates 200, 100, 200 stacked alternately on top of each other with an upper semi-permeable layer 210 shown transparently. 7 shows the longitudinal section through the three carrier plates 200, 100, 200 6 with the upper semi-permeable layer 210 shown in a non-transparent manner.

The semi-permeable layer 110 of a first carrier plate 100 is arranged on an underside 125 of the frame 120 of the carrier plate 100, based on an intended stacking direction 500 in the plate stack 400. The semi-permeable layer 210 of a second carrier plate 200 is arranged on an upper side 226 of the frame 220 in relation to an intended stacking direction 500 in the plate stack 400.

Grid-like support elements 300, 310, 320 are arranged between the carrier plates 100, 200. A first flow channel 410 for the second fluid stream 602 runs between the middle first carrier plate 100 and the upper second carrier plate 200. The fluid flow 602 flows through the grid-like support element 310. A second flow channel 420 runs between the lower second carrier plate 200 and the middle first carrier plate 100 the first fluid stream 600. The fluid stream 600 flows through the grid-like support element 320.

In 8th shows a plate stack 400 according to an embodiment of the invention in construction in an isometric view, while in 9 a plate stack 400 is shown in a finished state.

The plate stack 400 for a humidification device 1000, in particular for a fuel cell system, has a plurality of first and second carrier plates 100, 200 which alternately follow one another in the stacking direction 500, as shown in FIGS 1 until 7 are shown.

In the plate stack 400, first and second groups of flow channels 410, 420 are formed which are designed to allow flow to flow transversely to one another and are separated by the semi-permeable layers 110, 210, in particular moisture-permeable layers 110, 210, of the carrier plates 100, 200. Two of the flow channels 410, 420, which are designed to allow flow through each other, are formed by three of the alternating first and second carrier plates 100, 200. The first and/or second carrier plates 100, 200 have a grid-like support element 300, as in the 3 until 7 is shown.

The first flow channels 410 for the second fluid stream 602, for example the supply air from the fuel cell, run horizontally through the plate stack 400 in the illustrated embodiment, while the second flow channels 420 for the first fluid stream 600, for example the exhaust gas from the fuel cell, run vertically from top to bottom run through the plate stack 400.

On an outside of the plate stack 400 there is a receptacle 432 for an axial or radial seal 430, which is formed by incisions 170, 270 in the frame 120, 220 of the successive carrier plates 100, 200. With the seal 430, the entry area of the first fluid stream 600, i.e. the exhaust gas from the fuel cell, can be used when installing the plate stack 400 into the housing 1002 of a humidification device 1000, as shown in 10 is shown, must be sealed. A bypass flow that would otherwise occur in the housing 1002 can thus be effectively prevented.

10 shows a humidification device 1000, in particular for a fuel cell system, according to an exemplary embodiment of the invention in an isometric view.

The humidification device 1000 has a housing 1002, which has at least one input 1004 for a first fluid 600, in particular an exhaust gas of the fuel cell system, an input 1008 for a second fluid 602, in particular a supply air of the fuel cell system, an output 1006 for the first fluid 600 and an output 1010 for the second fluid 602. In the housing 1002 is a disk stack 400, as shown in 9 shown, arranged in which a plurality of first and second carrier plates 100, 200 are arranged alternately in a stacking direction 500.

Three of the alternating first and second carrier plates 100, 200 each form a first and a second group of flow channels 410, 420 which are designed to be flowable transversely to one another. The first group of flow channels 410 is between the inlet 1004 and the outlet 1006 for the first fluid 600 and the second group of flow channels 420 is arranged between the entrance 1008 and the exit 1010 for the second fluid 602.

Reference symbols

100

first carrier plate

110

semi-permeable layer

120

first frame

122

front side

124

Long side

125

bottom

126

Top

128

Support surface

130

opening

140

Spacer element

150

Connection area

152

Beading recording

154

Recording limit

160

Beading

170

incision

200

second carrier plate

210

semi-permeable layer

222

front side

224

Long side

225

bottom

226

Top

228

Support surface

230

opening

250

Connection area

252

Beading recording

254

Recording limit

260

Beading

270

incision

300

grid-like support element

400

Stack of plates

410

flow channel

420

flow channel

430

poetry

432

Recording

500

Stacking direction

600

first fluid (exhaust gas)

602

second fluid (supply air)

1000

Humidification device

1002

Housing

1004

Inlet first fluid

1006

Output first fluid

1008

Inlet second fluid

1010

Output second fluid

QUOTES INCLUDED IN THE DESCRIPTION

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Cited patent literature

• DE 102013020503 A1 [0002]

Claims (15)

Plate stack (400) for a humidification device (1000), in particular for a fuel cell system, with a plurality of first and second carrier plates (100, 200) alternating in a stacking direction (500), each of which comprises a circumferential frame (120, 220). , which encloses a through opening (130, 230), wherein in the plate stack (400) at least first and second groups of flow channels (410, 420) are formed which are designed to allow flow to flow transversely to one another and are separated by semi-permeable layers (110, 210), in particular moisture-permeable layers (110, 210), wherein three of the alternating first and second carrier plates (100, 200) each form two of the flow channels (410, 420) designed to allow flow to flow transversely to one another, and wherein the first and/or second support plates (100, 200) have a grid-like support element (300). stack of plates Claim 1 , wherein the semi-permeable layer (110, 210), based on the stacking direction (500), in the first or second carrier plates (100, 200) on an underside (125, 225) of the carrier plates (100, 200) and in the second or first carrier plates (200, 100) are arranged on an upper side (126, 226) of the carrier plates (100, 200). stack of plates Claim 1 or 2 , wherein the grid-like support element (300) is placed on the respective first and / or second support plate (100, 200), in particular is glued to the frame (120, 220). Plate stack according to one of the preceding claims, wherein the grid-like support elements (300) on the first support plates (100) are designed differently than those on the second support plates (200), in particular differing in height and/or thread spacing and/or crossing angle. Plate stack according to one of the preceding claims, wherein the frame (120) of the respective first carrier plate (100) has first end faces (122) with one or more beads (160) and first longitudinal sides (124) with a connecting region (150), the end faces (122) specify inflow and/or outflow areas of the first group of flow channels (410), the frame (220) of the respective second support plate (200) having second end faces (222) with a connecting area (250) and second longitudinal sides (224). one or more beads (260), the longitudinal sides (224) defining inflow and / or outflow areas of the second group of flow channels (420). stack of plates Claim 5 , wherein the first end faces (122) have at least one spacer element (140) for spacing the second end faces (222) of the following second support plate (200), in particular wherein the beads (160) and the spacer elements (140) on the first end faces ( 122) extend in opposite directions away from the first carrier plate (100) relative to the stacking direction (500). stack of plates Claim 5 or 6 , wherein the second end faces (222) in the connection area (250) have bead receptacles (252) for receiving beads (160) of the first end faces (122) of the adjacent first support plate (100), and wherein the first longitudinal sides (124) in the connection area ( 150) have bead receptacles (152) for receiving beads (260) of the following second carrier plate (200). Plate stack according to one of the preceding claims, wherein successive first and second carrier plates (100, 200) are connected to one another in a fluid-tight manner except for inflow or outflow areas, in particular on the frame (120, 220) of the carrier plates (100, 200). are glued together. Plate stack according to one of the preceding claims, wherein at least one receptacle (432) for an axial or radial seal (430) is arranged on an outside of the plate stack (400), in particular wherein the frames (120, 220) of the successive carrier plates (100, 200) have incisions (170, 270) through which the receptacle (432) is formed. Carrier plate (100) for a plate stack (400) according to one of the preceding claims for a humidification device (1000), in particular for a fuel cell system, comprising a circumferential frame (120) which encloses a through opening (130) and a support surface on the frame (120). (128) for a semi-permeable layer (110) which spans the opening (130) and completely covers it, the semi-permeable layer (110), based on an intended stacking direction (500) in the plate stack (400), on an underside (125 ) of the frame (120) is arranged. carrier plate Claim 10 , wherein the frame (120) has first end faces (122) with one or more beads (160) and first longitudinal sides (124) with a connecting area (150). Receiving boundaries (154) for beads (260) of a carrier plate (200) which is intended to be adjacent in the plate stack (400), the end faces (122) specifying inflow and/or outflow areas. Carrier plate (200) for a stack of plates (400) according to one of Claims 1 until 9 for a humidification device (1000), in particular for a fuel cell system, comprising a circumferential frame (220), which encloses a through opening (230) and has a support surface (228) on the frame (220) for a semi-permeable layer (210), which the opening (230) spans and completely covers, wherein the semi-permeable layer (210), based on a intended stacking direction (500) in the plate stack (400), is arranged on an upper side (226) of the frame (220). carrier plate Claim 12 , wherein the frame (220) has second end faces (222) with a connection area (250) with receiving boundaries (254) for beads (160) of a carrier plate (100) which is intended to be adjacent in the plate stack (400) and second longitudinal sides (224) with one or more Has beads (260), the long sides (224) specifying inflow and / or outflow areas. Carrier plate according to one of the Claims 10 until 13 , wherein the connection area (150, 250) has at least one adhesive surface and/or wherein the receiving boundary (154, 254) acts as a spacer to the frame (120, 220) of a carrier plate (100, 200) which is intended to be adjacent in the plate stack (400). Humidification device (1000) for a fuel cell system, with a housing (1002) which has at least one inlet (1004) for a first fluid (600), in particular an exhaust gas of the fuel cell system, an inlet (1008) for a second fluid (602), in particular a supply air of the fuel cell system, an outlet (1006) for the first fluid (600) and an outlet (1010) for the second fluid (602), with a plate stack (400) according to one of Claims 1 until 9 , in which a plurality of first and second carrier plates (100, 200) alternating in a stacking direction (500) are arranged, with three of the alternating first and second carrier plates (100, 200) being able to flow through a first and a second group transversely to one another formed flow channels (410, 420), the first group of flow channels (410) between the inlet (1004) and the outlet (1006) for the first fluid (600) and the second group of flow channels (420) between the inlet ( 1008) and the outlet (1010) for the second fluid (602) are arranged.

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