DE102019123534A1 - Humidifier with carrier plates and carrier plate for a humidifier - Google Patents

Abstract

The invention relates to a humidifying device (100), in particular for a fuel cell system, with a plurality of membrane plates (40) following one another in a plate stack (70) in a stacking direction (74), at least one membrane plate (40) having a carrier plate (10) comprises at least one membrane (12), flow channels (60) being arranged in the carrier plate (10). At least two groups of flow channels (50, 60) are formed in the plate stack (70). The carrier plate (10) has a membrane (12) on both sides. The first group of flow channels (50) is arranged between outer sides (18) of membranes (12) of the membrane plates (40) successive in the stacking direction (18), and the second group of flow channels (60) is between inner sides (20) of the membranes on both sides (12) arranged on the carrier plate (10) and delimited by the membranes (12) in the stacking direction (74). The invention also relates to a carrier plate (10) for a humidifier (100) and a fuel cell system with a humidifier (100).

Description

Technical area

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

State of the art

DE 102016224478 A1 discloses a membrane humidifier for fuel cell systems, in which humid exhaust gas from the fuel cell is used to humidify reaction gases in the fuel cells.

Disclosure of the invention

It is an object of the invention to provide an improved humidifying device.

Another object is to specify a carrier plate for such a humidifying device.

The aforementioned object is achieved according to one aspect of the invention by a humidifying device with a plurality of membrane plates following one another in a stack of plates in a stacking direction, at least one membrane plate comprising a carrier plate with at least one membrane, with flow channels being arranged in the carrier plate, and with the plate stack at least two groups of flow channels are formed; the carrier plate has a membrane on both sides; the first group of flow channels is arranged between outer sides of the successive membranes in the stacking direction and the second group of flow channels is arranged between inner sides of the two-sided membranes on the carrier plate and is delimited by the membranes in the stacking direction.

The further object is achieved according to a further aspect of the invention by a carrier plate for a humidifying device, a circumferential edge surrounding a receiving surface for a membrane and flow channels leading into the carrier plate at least in the edge from one end face.

Favorable configurations and advantages of the invention emerge from the further claims, the description and the drawing.

A humidification device is proposed with a plurality of membrane plates following one another in a stack of plates in a stacking direction, at least one membrane plate comprising a carrier plate with at least one membrane, flow channels being arranged in the carrier plate. At least two groups of flow channels are formed in the plate stack. The carrier plate has a membrane on both sides. The first group of flow channels is arranged between outer sides of membranes of the successive membrane plates in the stacking direction, and the second group of flow channels is arranged between inner sides of the two-sided membranes on the carrier plate and delimited in the stacking direction by the membranes.

In contrast to the prior art, in which each group of flow channels is arranged in its own plate, only half the number of plates is advantageously necessary, since the two groups of flow channels are formed in or on a membrane plate. The humidification device accordingly has a lower flow resistance. Likewise, fewer joints are necessary for the carrier plates in the plate stack. Each membrane plate, i.e. each carrier plate with a membrane on both sides, can be individually tested in production, which leads to a lower risk of rejecting membrane plates, since defective membrane plates can be identified and sorted out before they are joined together to form a stack of plates. Favorably, moist or water-rich fluid can flow in one group of flow channels, for example exhaust gas from fuel cells, while dry fluid, for example air, can flow in the other group of flow channels. The dry fluid can be moistened by the other fluid via the membrane.

The stacking direction can be straight, so that the plate stack of membrane plates is cuboid. The stacking direction can also be curved so that the arrangement of the membrane plates, for example, results in a ring.

According to a favorable embodiment, the membrane plate can have a receiving surface for a membrane, the receiving surface each having an edge section on at least two opposite sides on the receiving surface which is higher than the receiving surface with the membrane arranged thereon. The edge section advantageously protrudes at least on one side, advantageously on both sides, of the receiving surface with the membranes arranged thereon. If membrane plates are placed on top of one another, a flow channel is automatically formed between the membrane plates with the membrane arranged on them due to the difference in height between the edge section and the receiving surface. This flow channel is on two opposite sides through the outer sides of the membranes of the membrane plates following one another in the stacking direction and on the two other sides formed by the protrusion of the edge portion over the receiving surface of the carrier plate with a membrane arranged thereon.

According to a favorable embodiment, the membranes arranged on the carrier plate on both sides, on the upper side and on the lower side, can be designed in one piece and coherently and enclose the carrier plate in a U-shape. The carrier plate can simply be wrapped with the membrane. The cross section of the plate stack of the membrane plates can be square or elongated. In the case of an elongated plate, the membrane can be wrapped around the narrow side or wrapped around the broad side.

According to a favorable embodiment, the two groups of flow channels can run obliquely or transversely to one another. In particular, the flow channel between the outer sides of membranes of the membrane plates following one another in the stacking direction can be made considerably wider, in particular at least twice wider than a width of the flow channel with the smallest width of the flow channels between the inner sides of the membranes. In particular, a single flow channel can be formed between the outer sides of successive membranes in the stacking direction. The flow channel can be formed simply by laying membrane plates on top of one another. Advantageously, the flow channels between the inner sides of the membranes can be designed identically and equidistantly. In particular, these flow channels can run parallel to one another.

According to a favorable embodiment, the flow channels can have flow guide elements between the inner sides of the membranes arranged on both sides of the carrier plate. In particular, flow guide elements can be provided on different, preferably opposite, channel walls. In particular, flow guide elements can be arranged offset from one another on opposite channel walls along an extension of the respective flow channel through the carrier plate. The flow guide elements can direct the respective fluid towards the membrane and thus, for example, improve the transfer of moisture between the two groups of flow channels. The flow guide elements can advantageously be arranged on the insides of the membranes, which delimit the flow channel in the stacking direction.

According to a favorable embodiment, the carrier plates can be connected to one another in a fluid-tight manner. In particular, the carrier plates can be connected to one another at the edge, in particular welded or glued to one another. In this way, a reliable, fluid-tight connection between the carrier plates and a practically leak-free plate stack with membrane plates can be established. At the same time, the stack of plates can be mechanically very stable and robust.

According to a favorable embodiment, the membranes arranged on both sides of the carrier plate can be connected to the carrier plate at two or more of their outer edges, in particular welded or glued. The membranes can thereby be sealed at the edges. A flow short circuit between the two groups of flow channels can be avoided.

According to a favorable embodiment, a bypass path can be connected to the plate stack with membrane plates. In particular, a bypass path can be connected to a switching valve. This results in a compact arrangement and allows the stack of plates to be bypassed in certain operating states of the humidifier.

According to a favorable embodiment, at least the membrane plates can be arranged in a housing. The bypass path can also advantageously be arranged in the same housing.

According to a favorable embodiment, the membrane can be formed from a microporous material. The micropores in the material allow moisture to be transported through the membrane. The moisture transport can advantageously take place by means of capillary action in the microporous material. In particular, the membrane can be formed from PFSA. PFSA is a plastic made from perfluorosulfonic acid and is known, among other things, under the brand name Nafion.

According to a further aspect of the invention, a carrier plate for a humidifying device according to the invention is proposed, a circumferential edge surrounding a receiving surface for a membrane and flow channels leading into the carrier plate at least in the edge from one end face.

The carrier plate can advantageously be made of plastic, in particular polypropylene or fiber-reinforced polypropylene. The carrier plate can, for example, be injection-molded or embossed.

According to a favorable embodiment of the carrier plate, a receiving surface for receiving a membrane can be provided on both flat sides of the carrier plate

According to a favorable embodiment of the carrier plate, two edge sections lying opposite one another on the receiving surface can be made thicker than the other two edge sections. In particular, two opposite edges on both sides can protrude beyond the receiving surface in a stacking direction with a protrusion. The protrusion of the edge sections over the receiving surface is expediently so great that even with the membrane arranged on the receiving surface there is still a protrusion of the edge section over the membrane.

According to a favorable embodiment, at least the edge of the carrier plate can be formed from plastic, in particular from polypropylene or fiber-reinforced polypropylene.

According to a further aspect of the invention, a fuel cell system with a humidifying device according to the invention is proposed. A compact system is advantageously obtained in which a reliable moisture transfer from fuel cell exhaust gas to the reaction medium, in particular air or oxygen, is guaranteed.

Figure list

• 1 eine Befeuchtungseinrichtung nach einem Ausführungsbeispiel der Erfindung;
• 2 einen Längsschnitt durch die Befeuchtungseinrichtung nach 1 mit quaderförmigem Plattenstapel aus Membranplatten und einer darauf angeordneten Umgehungsleitung;
• 3 der Plattenstapel aus 2 mit teilweise abgeschnittenen Einlässen und Auslässen für ein Fluid und sichtbares Ventil in der Umgehungsleitung;
• 4 einen Querschnitt durch die Befeuchtungseinrichtung nach 1;
• 5 einen Plattenstapel nach 3 mit stirnseitiger Dichtung;
• 6 ein Detail des Plattenstapels aus 5 im Bereich der Stirnseite;
• 7 eine Membranplatte mit Trägerplatte und Membran nach einem Ausführungsbeispiel der Erfindung;
• 8 die Membranplatte nach 7 mit Befestigungsnaht;
• 9 in Explosionsdarstellung die Membran und die Trägerplatte der Membranplatte nach 7;
• 10 einen Schnitt durch eine Membranplatte nach einem weiteren Ausführungsbeispiel der Erfindung;
• 11 ein Detail der Membranplatte aus 10;
• 12 ein Plattenstapel mit Membranplatten nach einem Ausführungsbeispiel der Erfindung;
• 13 ein Detail des Plattenstapels nach 12 an einem Ende;
• 14 ein Detail des Plattenstapels nach 12 am gegenüberliegenden Ende;
• 15 ein Detail des Plattenstapels nach 12 an einem Ende;
• 16 ein Detail des Plattenstapels nach 12 am gegenüberliegenden Ende;
• 17 schematisch eine Befeuchtungseinrichtung nach einem weiteren Ausführungsbeispiel der Erfindung mit kreisförmiger Anordnung der Membranplatten;
• 18 einen Querschnitt der Befeuchtungseinrichtung nach 17;
• 19 eine Ansicht eines weiteren Ausführungsbeispiels einer Trägerplatte mit Wabenstruktur;
• 20 ein Detail einer Membranplatte mit der Trägerplatte aus 19.
• 21 in Draufsicht einen Ausschnitt der Trägerplatte aus 19 mit Längsstreben an einer Seite der Trägerplatte;
• 22 in Draufsicht einen Ausschnitt der Trägerplatte aus 19 mit Längsstreben an der gegenüberliegenden Seite.

Further advantages emerge from the following description of the drawings. Exemplary embodiments of the invention are shown in the drawings. The drawings, the description and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into meaningful further combinations. It shows by way of example:

• 1 a humidifier according to an embodiment of the invention;
• 2 a longitudinal section through the humidifier according to 1 with a cuboid plate stack made of membrane plates and a bypass line arranged thereon;
• 3rd the stack of plates 2 with partially cut off inlets and outlets for a fluid and visible valve in the bypass line;
• 4th a cross section through the humidifier according to 1 ;
• 5 a stack of plates 3rd with face seal;
• 6th a detail of the stack of plates 5 in the area of the front side;
• 7th a membrane plate with support plate and membrane according to an embodiment of the invention;
• 8th the membrane plate after 7th with fastening seam;
• 9 the membrane and the carrier plate of the membrane plate according to the exploded view 7th ;
• 10 a section through a membrane plate according to a further embodiment of the invention;
• 11 a detail of the membrane plate 10 ;
• 12th a plate stack with membrane plates according to an embodiment of the invention;
• 13th a detail of the plate stack after 12th at one end;
• 14th a detail of the plate stack after 12th at the opposite end;
• 15th a detail of the plate stack after 12th at one end;
• 16 a detail of the plate stack after 12th at the opposite end;
• 17th schematically, a humidifier according to a further embodiment of the invention with a circular arrangement of the membrane plates;
• 18th a cross section of the humidifier according to 17th ;
• 19th a view of a further embodiment of a carrier plate with a honeycomb structure;
• 20th a detail of a membrane plate with the carrier plate 19th .
• 21 in plan view a section of the carrier plate 19th with longitudinal struts on one side of the carrier plate;
• 22nd in plan view a section of the carrier plate 19th with longitudinal struts on the opposite side.

Embodiments of the invention

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

1 to 6th show a humidifier 100 according to an embodiment of the invention. The humidifier 100 can be used in particular for a fuel cell system.

1 shows an external view of the humidifier 100 . 2 shows a longitudinal section through the humidifying device 100 to 1 with cuboid stack of panels 70 and a bypass line 112 . 3rd shows the plate stack 70 out 2 with partially cut off case 102 and visible valve 114 in the bypass line 112 . 4th shows a cross section through the humidifier 100 to 1 . 5 shows the plate stack 70 to 3rd with front seal 72 and 6th shows a detail in a longitudinal section through the plate stack 70 out 5 in the area of its front side.

The humidifier 100 includes a housing 102 with an entrance 104 and an exit 106 for a first fluid, for example exhaust gas from fuel cells, and an inlet 108 and an exit 110 for a second fluid, for example air as a reaction medium for fuel cells. In the humidifier 100 there is a transfer of moisture from the first fluid to the second fluid.

In the case 102 is a cuboid stack of panels 70 arranged in the membrane plates in a stacking direction 74 follow one another. The stack of plates 70 is on its front sides against the housing 102 sealed. This can be done with a seal running around the end faces 72 , for example an elastomer seal or a potting compound or adhesive. On the stack of plates 70 is in the housing 102 a bypass line 112 arranged with a switchable valve 114 can be released or blocked. The bypass line 112 is to the plate stack 70 with an unspecified base plate ( 3rd , 4th ) sealed.

The first fluid, for example moist exhaust gas, in particular from a fuel cell, passes through the in 1 at the bottom of the housing 102 arranged entrance 104 in the housing 102 and flows through flow channels 50 through the stack of plates 70 , in 2 from left to right, and releases moisture. The flow channels 50 form a first group of flow channels 50 , 60 and go by the entrance 104 near outside of the plate stack 70 out into the plate stack 70 in and step through the in 1 at the bottom of the housing 102 arranged exit 106 out of the case 102 out.

The second fluid, for example dry air, especially for a fuel cell, passes through the in 1 on the front side of the housing 102 arranged entrance 108 in the housing 102 and flows through flow channels 60 through the stack of plates 70 , in 2 from the front into the picture plane, and absorbs moisture. The flow channels 60 form a second group of flow channels 50 , 60 and go by the entrance 108 near outside of the plate stack 70 out into the plate stack 70 in and step through the in 1 on the back of the housing 102 arranged exit 110 out of the case 102 out ( 4th ).

The two groups of flow channels 50 , 60 are provided in a cross-flow arrangement, ie the directions of the flow channels 50 , 60 are arranged obliquely or perpendicular to each other.

How 5 and 6th on the stack of plates 70 On their own, there are a large number of membrane plates 40 (only one of them is numbered with a reference numeral) in the stacking direction 74 stacked on top of each other and on two front sides with a circumferential seal each 72 , for example an elastomer seal, edged. Optionally, a potting compound or adhesive can also be used for sealing against the housing 102 be provided.

The first group of flow channels 50 is in the plate stack 70 between the membrane plates 40 arranged while the second group of flow channels 60 each in the membrane plates 40 is arranged.

7th to 11 show a membrane plate 40 according to an embodiment of the invention, which is a carrier plate 10 and a membrane 12th having.

7th shows the carrier plate 10 with membrane 12th , 8th shows the carrier plate 10 with membrane 12th and a fastening seam 22nd on three or four sides of the membrane 12th , and 9 shows the membrane in an exploded view 12th and the carrier plate 10 . 10 and 11 show details of flow channels 60 in the membrane plate 40 with one along a flow channel 60 cut membrane plate 40 .

The carrier plate 10 the membrane plate 40 has a receiving surface 36 for the membrane 12th on. This is on both sides 14th , 16 the carrier plate 10 a recording surface 36 intended. On each of the two recording surfaces 36 is a membrane 12th arranged. The membrane 12th on both sides 14th , 16 the carrier plate 10 is formed continuously in this embodiment. In other configurations, the membranes 12th but also separate membranes 12th be and each on the top 14th and on the bottom 16 the carrier plate 10 be arranged.

The recording area 36 is from an edge 30th surrounded with two at the receiving surface 36 opposite edge sections 32 , for example on the broad side, and two edge sections 34 on the narrow side of the carrier plate 10 . The edge has at least two opposite sides 30th one edge section each 32 that is higher than the receiving surface 36 with membranes arranged on it 12th on the pages 14th , 16 and a supernatant 38 between the edge sections 32 and the receiving surface 36 forms. Also with membrane 12th on the recording surface 36 the edge section protrudes 32 over the outside 18th the membrane 12th .

The cohesive one-piece membrane 12th encloses the carrier plate 10 U-shaped. The membrane is on the open face and on the long sides 12th at the receiving surface 36 with the fastening seam symbolized by a dash-dotted line 22nd set. However, a fastening seam can also be on more or fewer sides of the membrane 12th be provided.

The recording area 36 In this exemplary embodiment, it has a ladder-like structure, with cross struts between the higher edge sections 32 , as well as with a central strut, the one with the lower edge sections 34 is aligned and parallel to the higher edge sections 32 runs.

From a front side 66 the carrier plate 10 at the higher edge sections 32 go flow channels 60 in the carrier plate 10 starting between the edge sections 32 from the membrane 12th on both sides 14th , 16 to be covered.

The flow channels 60 therefore run between the insides 20th the membrane 12th in the carrier plate 10 or membrane plate 40 .

The flow channels 50 run on the other hand on the outside 18th the membrane 12th . The flow channels 50 are formed when membrane plates 40 stacked on top of each other and connected to each other. The channel height of the flow channels 50 corresponds to twice the height of the overhang 38 of the higher edge section 32 minus the total thickness of the two membranes 12th showing the flow channels 50 complete in stacking direction. In this exemplary embodiment, the channel width corresponds to a flow channel 50 the distance between the two higher edge sections 32 and is therefore considerably wider than the flow channels 60 between the insides 20th of the membranes 12th on the sides 14th , 16 the carrier plate. The flow channels 60 are, for example, designed the same as one another.

As in 10 and 11 along a cut-open flow channel 60 can be seen are in the flow channels 60 Flow control elements 64 arranged. The flow guide elements 64 are on opposite canal walls, here through the insides 20th of the two membranes 12th formed, provided and along an extension of the respective flow channel 60 through the carrier plate 10 arranged offset to one another. This allows the fluid in the flow channel 60 to the membrane 12th and so the moisture transfer across the membrane 12th improve.

12th to 16 show different aspects of a stack of plates 70 with several membrane plates 40 as described above. Reference is made to the previous description of the figures in order to avoid unnecessary repetition.

12th shows a stack of plates 70 with longitudinally cut flow channels 60 , 13th shows a detail of the plate stack 70 to 12th at the outlet end of the flow channels 50 . 14th shows a detail of the plate stack 70 to 12th at the inlet end of the flow channels 50 , 15th shows a detail of the plate stack 70 at the inlet end of the flow channels 50 and 16 shows a detail of the plate stack 70 at the outlet end of the flow channels 50 .

The membrane plates 40 are in the stacking direction 74 stacked on top of each other and together on the higher frame section 32 connected, for example welded or glued.

The flow channels 60 that from the front 66 the membrane plate 40 going out are through partitions 62 separated from each other. In the flow channels 60 are for example flow guide elements 64 arranged.

The flow channels 60 run between the insides 20th of the membranes 12th on the pages 14th , 16 the carrier plate 10 . The flow channels 50 run across it between the outsides 18th of membranes 12th the one in the plate stack 70 immediately adjacent membrane plates 40 .

In this example form is the membrane 12th at the top 14th and the bottom 16 of the membrane plates 40 in one piece and is U-shaped around the support plate of the membrane plate 40 placed.

In 15th and 16 can clearly be seen that the flow channels 50 and 60 in the plate stack 70 cross over.

17th shows schematically a humidifying device 100 according to a further embodiment of the invention with a radial plate arrangement 76 . 18th shows a cross section of the humidifier 100 to 17th .

In this embodiment, the stacking direction is 74 curved so that when the membrane plates are joined together 40 which can be formed as described above, a circular arrangement 76 of the membrane plates 40 forms in the form of a ring.

The ring is on one end with a clasp 116 sealed. Against the case 102 is the ring is sealed on the upper and lower end with a seal around the edge.

The membrane plates 40 are on the outer circumference of the stack of plates 76 further apart than on the inner circumference.

The flow channels 60 go, for example, from the end faces of the round stack of panels 76 off while the flow channels 50 lead from the outer circumference to the inner circumference. The first fluid, for example moist exhaust gas from fuel cells, flows through an inlet 104 in the housing 102 a, flows from the outer circumference to the inner circumference of the circular arrangement 76 of the membrane plates 40 and from there through a centrally located exit 106 from.

The second fluid, for example air, flows through the entrance 108 over the face of the round stack of panels 76 through the membrane plates to the opposite end and through an exit 110 from.

19th to 22nd show a further embodiment of a carrier plate 10 . 19th shows a view of the carrier plate 10 , which is not designed like a ladder, but a honeycomb-like structure 80 having. 20th shows a detail of a membrane plate 40 with the carrier plate 10 out 19th . 21 and 22nd show sections of the carrier plate in plan view 10 with longitudinal struts 94 on one side 14th and longitudinal struts 96 the other side 16 .

The carrier plate 10 points on each side 14th , 16 a recording surface 36 for a membrane 12th on. On each of the two recording surfaces 36 is a membrane 12th arranged ( 20th ). The membrane 12th can be in one piece and extend over both sides 14th , 16 the carrier plate 10 extend. In other configurations, the membranes 12th but also separate membranes 12th and in each case on the upper side in the figure 14th and on the lower side 16 the carrier plate 10 be arranged.

The recording area 36 is from an edge 30th surrounded with two at the receiving surface 36 opposite edge sections 32 , for example on the broad side, and two edge sections 34 on the narrow side of the carrier plate 10 . The edge has at least two opposite sides 30th one edge section each 32 that is higher than the receiving surface 36 with a membrane arranged on it 12th and a supernatant 38 between the edge sections 32 and the receiving surface 36 forms. Also with a membrane 12th on the recording surface 36 the edge section protrudes 32 over the outside 18th the membrane 12th .

From a front side 66 the carrier plate 10 at the higher edge sections 32 go flow channels 60 in the carrier plate 10 starting between the edge sections 32 from the membrane 12th on both sides 14th , 16 to be covered. The flow channels 60 therefore run between the insides 20th the membrane 12th in the carrier plate 10 or membrane plate 40 . The flow channels 60 are at least on one of the higher edge sections 32 formed equidistant and in the edge section 32 through partitions 62 Cut. The flow channels 60 are, for example, designed the same as one another.

The carrier plate 10 points in their recording areas 36 in this embodiment a honeycomb structure 80 on, with sloping, dividing and meeting struts between the higher edge sections 32 , as well as with longitudinal struts 94 , 96 on each side 14th , 16 the ones with the lower margin sections 34 or the respective support surfaces 36 of the sides 14th , 16 align and, for example, parallel to the higher edge sections 32 run away. For example, two or more such longitudinal struts can be used 94 , 96 on each side 14th , 16 be arranged.

The longitudinal struts 94 on the side 14th and the longitudinal struts 96 on the side 16 are offset from one another in such a way that the longitudinal struts 96 on the lower side in the figure 16 between the two in 19th and 21 recognizable longitudinal struts 94 on the side 14th are arranged as in 22nd can be seen.

The sloping struts of the honeycomb structure 80 are at least partially thinner than the lower edge section 34 of the edge sections 32 , 34 . The struts show first areas 84 and second areas 86 on that have a height offset with one level each 82 exhibit. The first areas 84 align with the receiving surface 36 on the one hand 14th the carrier plate 10 , the second areas 86 align with the receiving surface 36 on the opposite side 16 the carrier plate 10 .

The membrane 12th on one side 14th the carrier plate 10 lies with its inside on the first areas 84 the honeycomb structure 80 at, the first ranges 84 to the inside of the membrane 12th on the opposite side 16 the carrier plate 10 are spaced. The membrane 12th on the opposite side 16 is due to the second areas 86 at, the second ranges 86 to the inside of the membrane 12th on the opposite side 14th are spaced.

Due to the height offset between the areas 84 , 86 the fluid enters the Flow channels 60 in frequent contact with the insides of the membranes 12th so that a moisture transition between the flow channels 50 , 60 can be improved

The flow channels 50 are not shown and run on the outside as in the previous exemplary embodiments 18th the membrane 12th The flow channels 50 are formed when membrane plates 40 stacked on top of each other and connected to each other. The channel height of the flow channels 50 corresponds to twice the height of the overhang 38 of the higher edge section 32 minus the total thickness of the two membranes 12th showing the flow channels 50 complete in stacking direction.

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• DE 102016224478 A1 [0002]

Claims (15)

Humidification device (100), in particular for a fuel cell system, with a plurality of membrane plates (40) following one another in a plate stack (70) in a stacking direction (74), at least one membrane plate (40) being a carrier plate (10) with at least one membrane ( 12), wherein flow channels (60) are arranged in the carrier plate (10), characterized in that (i) at least two groups of flow channels (50, 60) are formed in the plate stack (70); (ii) the carrier plate (10) has a membrane (12) on both sides; (iii) the first group of flow channels (50) is arranged between outer sides (18) of membranes (12) of the membrane plates (40) successive in the stacking direction (74) and (iv) the second group of flow channels (60) between inner sides (20) ) the membrane (12) on both sides is arranged on the carrier plate (10) and delimited by the membranes (12) in the stacking direction (74). Humidification device according to Claim 1 , characterized in that the membrane plate (40) has a receiving surface (36) for the membrane (12), the receiving surface (36) having an edge section (32) on at least two opposite sides of the receiving surface (36), which is formed higher than the receiving surface (36) with the membrane (12) arranged thereon. Humidification device according to Claim 1 or 2 , characterized in that the membrane (12) arranged on both sides of the carrier plate (10) is constructed in one piece and is connected to one another and encloses the carrier plate (10) in a U-shape. Humidification device according to one of the preceding claims, characterized in that the two groups of flow channels (50, 60) run obliquely or transversely to one another, in particular the flow channel (50) between the outer sides (18) of membranes (12) in the stacking direction (74 ) successive membranes (12) is made considerably wider, in particular at least twice wider than a width of the flow channel (60) with the smallest width of the flow channels (60) between the inner sides (20) of the membranes (12) on both sides of the carrier plate (10) ), in particular a single flow channel (50) being formed between the outer sides (18) of membranes (12) following one another in the stacking direction (74). Humidification device according to one of the preceding claims, characterized in that the flow channels (60) between the inner sides (20) of the membranes (12) arranged on both sides of the carrier plate (10) have flow guide elements (64), in particular flow guide elements (64) being provided on opposite channel walls are, in particular wherein flow guide elements (64) are arranged offset to one another on opposite channel walls along an extension of the respective flow channel (60) through the carrier plate (10). Humidifying device according to one of the preceding claims, characterized in that the carrier plates (10) are connected to one another in a fluid-tight manner, in particular are connected to one another at the edge (30), in particular are welded or glued to one another. Humidification device according to one of the preceding claims, characterized in that the membranes (12) arranged on both sides of the carrier plate (10) are connected to the carrier plate (10) at two or more of their outer edges, in particular welded or glued. Humidification device according to one of the preceding claims, characterized in that a bypass path (112) is connected to the plate stack (70) with membrane plates (40), in particular a bypass path (112) with a switching valve (114) is connected. Humidification device according to one of the preceding claims, characterized in that at least the membrane plates (40) are arranged in a housing (102). Humidification device according to one of the preceding claims, characterized in that the membranes (12) are formed from a microporous material, in particular from a moisture-permeable or water-permeable material, in particular from a PFSA membrane. Support plate (10) for a humidifying device (100) according to one of the preceding claims, characterized in that a circumferential edge (30) surrounds a receiving surface (36) for a membrane (12) and flow channels (60) at least in the edge (30) of one end face (66) into the carrier plate (10) Carrier plate after Claim 11 , characterized in that a receiving surface (36) for receiving a membrane (12) is provided on both flat sides of the carrier plate (10). Carrier plate after Claim 11 or 12th , characterized in that two are attached to the Reception surface (36) opposite edges (32) are formed higher than the other two opposite edges (34), in particular two opposite edges (32) on both sides over the reception surface (36) in a stacking direction (74) with a protrusion (38) ) survive. Support plate according to claim one of Claims 11 to 13th , characterized in that at least the edge (30) of the carrier plate (10) is formed from plastic, in particular from polypropylene or fiber-reinforced polypropylene. Fuel cell system with a humidifying device (100) according to one of the Claims 1 to 9 .

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