DE102019217210A1 - Cell arrangement - Google Patents

Abstract

The invention relates to a cell arrangement (100) which has a pressure-resistant housing (10), with at least one first electrode arrangement (20) and at least one second electrode arrangement (40) in the housing (10), the at least one first electrode arrangement (20) at least one first membrane electrode unit (30) with a first anode (31) and a first cathode (32), which are separated from one another by a first membrane (33), and wherein the at least one second electrode arrangement (40) at least a second Membrane-electrode unit (50) with a second anode (51) and a second cathode (52), which are separated from one another by a second membrane (53). The invention further relates to a motor vehicle which has at least one cell arrangement (100 ) includes.

Description

The invention relates to a cell arrangement which has a pressure-resistant housing, the housing comprising at least one first electrode arrangement and at least one second electrode arrangement, the at least one first electrode arrangement having at least one first membrane-electrode unit with a first anode and a first cathode, which are mutually are separated by a first membrane, and wherein the at least one second electrode arrangement has at least one second membrane-electrode unit with a second anode and a second cathode, which are separated from one another by a second membrane.

The invention also relates to a motor vehicle which comprises at least one cell arrangement according to the invention.

State of the art

It is becoming apparent that in the future, especially in vehicles, more and more electrical systems will be used that combine advanced technology for energy generation with electrical drive technology. Fuel cells form one possibility for generating electrical energy for an electrical drive system of a vehicle.

A fuel cell is a galvanic cell that converts the chemical reaction energy of a continuously supplied fuel and an oxidizing agent into electrical energy. A fuel cell is therefore an electrochemical energy converter. In known fuel cells, hydrogen (H2) and oxygen (02) in particular are converted into water (H2O), electrical energy and heat.

An electrolyser is usually used to generate hydrogen. An electrolyzer is an electrochemical energy converter which splits water (H20) into hydrogen (H2) and oxygen (O2) using electrical energy. Compressors are usually used so that the hydrogen produced can be stored in a high-pressure storage device.

The fuel cell, the electrolyzer and the compressor can each be designed as a cell and based on polymer electrolyte membranes, which are also referred to as proton exchange membranes (PEM). Several individual cells can be arranged in a stack. The single cell usually comprises a membrane electrode assembly (Membrane Electrode Assembly, MEA) which has two electrodes, namely an anode and a cathode, which are separated by a polymer electrolyte membrane (PEM). A gas diffusion layer for even distribution of the medium, such as, for. B. gases and liquids, or for a regulated media transport. Electrolyzers and compressors designed on the basis of PEM are also referred to as PEM electrolyzers and electrochemical compressors.

The single cell also includes bipolar plates for contacting the anode and the cathode and for media routing. Channels for media distribution within the stack are generated through recesses in the bipolar plates. This stack is usually held together by clamping plates screwed against each other, on which the media connections of the stack are also located. Each individual cell or individual parts such as bipolar plates must be sealed from the environment as well as internally between the anode and cathode side or between the individual media ducts.

Disclosure of the invention

A cell arrangement is proposed. The cell arrangement includes a pressure-resistant housing. At least one first electrode arrangement and at least one second electrode arrangement are arranged in the housing, the at least one first electrode arrangement having at least one first membrane-electrode unit with a first anode and a first cathode, which are separated from one another by a first membrane, and wherein the at least one second electrode arrangement has at least one second membrane-electrode unit with a second anode and a second cathode, which are separated from one another by a second membrane.

According to the invention, the at least one first and the at least one second electrode arrangement are cylindrical and have a closed cross section. The at least one first electrode arrangement has a first type, while the at least one second electrode arrangement has a second type. The first type and the second type are each selected from a fuel cell, an electrolyzer and an electrochemical compressor-membrane-electrode unit.

A cylinder is a geometric body in which two parallel, flat, congruent base surfaces are connected to one another by a lateral surface. A cylinder in the sense of the invention is preferably a vertical cylinder in which the two base surfaces are perpendicular to a longitudinal axis of the cylinder. In this case, the two base areas and a cross section of the cylinder are identical in shape and size to one another. The two base areas as well as the cross section of the cylinder can be circular, oval or polygonal. Thus, an elliptical cylinder and a prism also fall under the term cylinder in the context of the invention.

The at least one cylindrical first electrode arrangement with a closed cross section and the at least one cylindrical second electrode arrangement with a closed cross section divide an interior of the cell arrangement according to the invention into several mutually sealed sub-interiors. The plurality of partial interiors are connected to one another in such a way that protons are passed through the first membrane of the at least one first membrane-electrode unit.

The at least one first electrode arrangement has a first carrier for carrying the at least one first membrane-electrode unit. The first carrier can also be cylindrical and closed in cross section.

The at least one second electrode arrangement has a second carrier for carrying the at least one second membrane-electrode unit. The first carrier can also be cylindrical and closed in cross section.

Furthermore, bipolar plates and gas diffusion layers can be provided for the first anode and the first cathode. As a result of appropriate insulation, there is no electrically conductive connection between the first anode and the first cathode of the at least one first membrane-electrode unit.

Bipolar plates and gas diffusion layers can also be provided for the second anode and the second cathode. As a result of appropriate insulation, there is no electrically conductive connection between the second anode and the second cathode of the at least one second membrane-electrode unit.

A gas-permeable, electrically insulating layer can be arranged between the at least one first electrode arrangement and the at least one second electrode arrangement. This gas-permeable, electrically insulating layer serves both for the uniform distribution of the gas and for the electrical separation of the at least one first electrode arrangement and the at least one second electrode arrangement.

The first type and the second type are preferably different from one another.

The at least one first membrane-electrode unit is advantageously designed as an electrolyzer-membrane-electrode unit, while the at least one second membrane-electrode unit is designed as an electrochemical compressor-membrane-electrode unit. Alternatively, the at least one first membrane-electrode unit can be designed as an electrochemical compressor-membrane-electrode unit, while the at least one second membrane-electrode unit is designed as an electrolyzer-membrane-electrode unit.

It is also advantageous that the at least one first membrane-electrode unit is designed as a fuel cell-membrane-electrode unit, while the at least one second membrane-electrode unit is designed as an electrochemical compressor-membrane-electrode unit. Alternatively, the at least one first membrane-electrode unit can be designed as an electrochemical compressor-membrane-electrode unit, while the at least one second membrane-electrode unit is designed as a fuel cell-membrane-electrode unit.

The housing, the at least one first and the at least one second electrode arrangement each have a round, oval or polygonal cross section. The term polygonal cross section includes, for example, a triangular, rectangular, star-shaped and cross-shaped cross section of a cylindrically designed body. Particularly preferably, the housing, the at least one first and the at least one second electrode arrangement each have a round or a rectangular cross section.

The cross section of the housing, the cross section of the at least one first electrode arrangement and the cross section of the at least one second electrode arrangement can each be selected to be different.

The cell arrangement according to the invention preferably comprises a plurality of first electrode arrangements. The plurality of first electrode arrangements are preferably arranged coaxially to one another in the housing. A bipolar plate is preferably arranged between each two first electrode arrangements. However, it is conceivable that the plurality of first electrode arrangements are arranged next to one another in the housing. The multiple first electrode arrangements can have different cross-sections.

The plurality of first electrode arrangements can be arranged coaxially to one another in the housing in such a way that the adjacent first electrode arrangements are always identical Electrode sides, that is to say anode sides or cathode sides of the at least one first membrane-electrode unit of the respective first electrode arrangements, face one another.

It is also conceivable that the several first electrode arrangements are divided into several groups. The multiple groups each have a number of the first electrode arrangements which are arranged coaxially to one another. The several groups are then arranged next to one another in the housing. For example, the plurality of first electrode arrangements can be divided into a first and a second group, the first group having a first number of the first electrode arrangements that are arranged coaxially to one another, while the second group has a second number of the first electrode arrangements that are coaxial are arranged to each other. The first group and the second group are arranged next to one another in the housing. The first number of first electrode arrangements is preferably equal to the second number of first electrode arrangements.

The cell arrangement according to the invention preferably comprises a plurality of second electrode arrangements. The plurality of second electrode arrangements are preferably arranged coaxially to one another in the housing. A bipolar plate is preferably arranged between each two second electrode arrangements. However, it is also conceivable that the plurality of second electrode arrangements are arranged next to one another in the housing. The plurality of second electrode arrangements can have different cross sections.

The plurality of second electrode arrangements can be arranged coaxially to one another in the housing in such a way that the adjacent second electrode arrangements always face one another with the same electrode sides, i.e. anode sides or cathode sides of the at least one second membrane electrode unit of the respective second electrode arrangements.

It is also conceivable that the several second electrode arrangements are divided into several groups. The multiple groups each have a number of the second electrode arrangements which are arranged coaxially to one another. The several groups are then arranged next to one another in the housing.

The at least one second electrode arrangement can be arranged coaxially with or next to the at least one first electrode arrangement. It is preferred that the at least one first electrode arrangement and the at least one second electrode arrangement are arranged coaxially to one another.

If the plurality of first or a plurality of second electrode arrangements are arranged coaxially to one another in the housing, the first or second membrane electrode units of which are designed as an electrochemical compressor membrane electrode unit, a multi-stage electrochemical compressor is formed. In this way, too great a pressure difference on the membrane-electrode unit can be avoided with only one pressure level. In this case, the adjacent first or second electrode arrangements always face one another with different electrode sides.

With the cell arrangement according to the invention, the cross-sections of the partial interiors in front of the anode and the cathode can be made so large that the anode and the cathode of a membrane-electrode unit designed as a fuel cell-membrane-electrode unit when the fuel cell is operated with pure oxygen , the anode is operated as a membrane electrode unit designed as an electrolyzer membrane electrode unit and the anode of a membrane electrode unit designed as an electrochemical compressor membrane electrode unit in a so-called "dead-end operation" can be. This means that recirculation of the gases or water is no longer necessary. For example, a distance between the adjacent electrode arrangements can be at least 1 mm. The distance is preferably in a range from 1 mm to 10 cm.

In the case of a fuel cell with pure oxygen operation, the housing can therefore be designed free of discharge connections which serve to discharge excess fuel, in particular hydrogen, and excess oxygen. This means that only two supply line connections need to be attached to the housing, which are used to supply a fuel, in particular hydrogen, and the oxygen. The housing has further connections, which are used, for example, for the passage of a temperature control medium and for the discharge of water resulting from reaction or condensation.

In the case of an electrolyzer, the housing can also be designed free of drainage connections that serve to remove excess water to be split. The housing here has further connections which, for example, serve to discharge the water that has passed through the membrane due to the osmotic effect.

In the case of an electrochemical compressor, the housing can also be free of Drainage connections, which serve to remove excess hydrogen to be compressed, are designed. The housing has further connections, which are used, for example, for the passage of a temperature control medium and for the discharge of water resulting from condensation.

With a correspondingly large cross section of the partial interiors facing the cathode of the at least one first membrane electrode unit configured as a fuel cell membrane electrode unit, the cell arrangement configured as a fuel cell can be cooled by an increased air / oxygen throughput. The housing has two connections, one of which is used to supply the air / oxygen and the other is used to remove the air / oxygen. Alternatively, the cooling can also be implemented by an increased throughput of fuel, in particular hydrogen, the housing having two connections, one of which is used to supply the fuel and the other to discharge the fuel. Combined cooling by simultaneously increasing the air / oxygen throughput and the fuel throughput is also possible.

A motor vehicle is also proposed which comprises at least one cell arrangement according to the invention.

Advantages of the invention

The cell arrangement according to the invention has a geometrically simple structure. The assembly of the cell arrangement according to the invention is thus greatly simplified.

With the cell arrangement according to the invention, it is possible to make the cross-sections of the partial interiors in front of the anode and the cathode large. As a result, the flow resistance or the pressure loss of the gases is very low and there is no concentration gradient in the direction of flow. Here, a local concentration of the gases at the anode and the cathode is determined via the pressure of the gases and not the geometric position in the partial interiors. It is thus possible for the anode and the cathode of a fuel cell as well as the anode of an electrochemical compressor to be operated in so-called “dead-end operation”. As a result, there is no need to recirculate the gases.

Furthermore, with the cell arrangement according to the invention it is possible to use an electrochemical compressor for local extraction of hydrogen from the natural gas network through a correspondingly large cross section on the anode side in full flow with practically no pressure loss or pumping effort.

In addition, cooling via an additional coolant circuit in a fuel cell can be replaced by a correspondingly large cross section on the cathode side by an increased air throughput. This also enables the construction of the cell arrangement according to the invention to be simplified. In addition, with appropriate arrangement of the cell arrangement according to the invention, such as perpendicular or inclined to the horizontal plane, an independent drainage of water from condensation, reaction or water that passes through the membrane due to osmotic effects can easily be achieved.

Due to the simple construction of the cell arrangement according to the invention or the omission of the integrated cooling, material for the wall or carrier for supporting the at least one first and second membrane electrode unit can be saved, especially with a coaxial arrangement of the at least one first and the at least second electrode arrangement. This enables both a weight reduction and a cost reduction for material and assembly of the cell arrangement according to the invention.

In addition, a pressure-balanced fuel cell or a pressure-balanced electrolyzer can easily be implemented with the cell arrangement according to the invention, since an individual electrode arrangement does not have to be sealed off from the external environment of the cell arrangement. The maximum pressure of the anode or the cathode is thus only determined by the maximum pressure of the pressure-tight housing of the cell arrangement. A pressure-balanced fuel cell or a pressure-balanced electrolyzer is to be understood as meaning that approximately the same pressure prevails on the anode side and cathode side of the fuel cell or of the electrolyzer. As a result, there is no great pressure drop across the membrane-electrode unit, which leads to less mechanical stress on the membrane-electrode unit and less gas diffusion through the membrane. An established sealing method, e.g. for flanges, can be used to seal the pressure-tight housing of the cell arrangement. A corresponding pressure between the membrane-electrode unit and the contacting surfaces and thus a good electrical contact can be ensured by a small pressure difference between the anode and the cathode.

The cell arrangement designed as an electrochemical compressor is also well suited for a solid oxide fuel cell, since a large gas throughput can be made possible with very little pressure loss.

With the cell arrangement according to the invention, light parts can be replaced by non-metallic materials, such as plastic or carbon fiber, without any requirements for electrical conductivity. This also leads to a weight reduction and a cost reduction.

Figure list

Embodiments of the invention are explained in more detail with reference to the drawings and the following description.

• 1 eine schematische Querschnittdarstellung einer Zellanordnung gemäß einer ersten Ausgestaltung,
• 2 eine schematische erste Längsschnittdarstellung der Zellanordnung gemäß der ersten Ausgestaltung,
• 3 eine schematische zweite Längsschnittdarstellung der Zellanordnung gemäß der ersten Ausgestaltung,
• 4 eine schematische Querschnittdarstellung einer Zellanordnung gemäß einer zweiten Ausgestaltung und
• 5 eine schematische Querschnittdarstellung einer Zellanordnung gemäß einer dritten Ausgestaltung.

Show it:

• 1 a schematic cross-sectional representation of a cell arrangement according to a first embodiment,
• 2 a schematic first longitudinal sectional view of the cell arrangement according to the first embodiment,
• 3rd a schematic second longitudinal sectional view of the cell arrangement according to the first embodiment,
• 4th a schematic cross-sectional representation of a cell arrangement according to a second embodiment and
• 5 a schematic cross-sectional illustration of a cell arrangement according to a third embodiment.

Embodiments of the invention

In the following description of the embodiments of the invention, the same or similar elements are denoted by the same reference numerals, with a repeated description of these elements in individual cases being dispensed with. The figures represent the subject matter of the invention only schematically.

1 shows a schematic cross-sectional representation of a cell arrangement according to the invention 100 according to a first embodiment. The cell arrangement according to the invention 100 includes a pressure-resistant, rectangular housing 10 , in which a first electrode arrangement 20th and a second electrode assembly 40 are arranged coaxially to one another.

The first electrode arrangement 20th is also rectangular and comprises four first membrane-electrode units 30th and a first carrier 22nd for carrying the first four membrane electrode assemblies 30th . The first four membrane-electrode assemblies 30th each include a first anode 31 and a first cathode 32 which through a first membrane 33 are separated. For the first anode 31 and the first cathode 32 of the respective first membrane electrode units 30th bipolar plates and gas diffusion layers can be provided. Due to the appropriate insulation, there is no electrically conductive connection between the first anode 31 and the first cathode 32 of the respective first membrane electrode units 30th .

The second electrode arrangement 40 is also rectangular and comprises four second membrane-electrode units 50 and a second carrier 42 for carrying the four second membrane electrode assemblies 50 . The four second membrane-electrode units 50 each include a second anode 51 and a second cathode 52 which through a second membrane 53 are separated. For the second anode 51 and the second cathode 52 of the respective second membrane-electrode units 50 bipolar plates and gas diffusion layers can be provided. Due to the appropriate insulation, there is no electrically conductive connection between the second anode 51 and the second cathode 52 of the respective second membrane-electrode units 50 .

The case 10 , the first electrode array 20th and the second electrode assembly 40 can have different cross-sections. For example, the housing 10 , the first electrode array 20th and the second electrode assembly 40 each have a round cross-section. It is also possible that the housing 10 has a rectangular / polygonal cross section, while the first and second electrode arrangements 20th , 40 each have a round cross-section.

Due to the first and second electrode arrangement, which are closed in cross-section 20th , 40 is an interior 11 the cell arrangement according to the invention 100 in a first partial interior 12th , a second partial interior 13th and a third partial interior 14th divided, which are sealed against each other.

Between the first electrode arrangement 20th and the second electrode assembly 40 is a gas-permeable, electrically insulating layer 60 in the second part of the interior 13th arranged, both for the uniform distribution of the gas, as well as for the electrical separation of the first electrode arrangement 20th and the second electrode assembly 40 serves.

The first four membrane-electrode assemblies 30th have a first type, which is selected from a fuel cell, an electrolyzer and an electrochemical compressor-membrane-electrode unit. The four second membrane-electrode units 50 have a second type, which is also selected from a fuel cell, an electrolyzer and an electrochemical compressor-membrane-electrode unit. The second type differs from the first type.

In 1 are the first four membrane-electrode assemblies 30th and the four second membrane-electrode assemblies 50 arranged such that the first anodes 31 of the respective first membrane electrode units 30th the first partial interior 12th facing and the second cathode 52 of the respective second membrane-electrode units 50 the third part interior 14th is facing while the first cathode 32 of the respective first membrane electrode units 30th and the second anode 51 the second partial interior 13th are facing.

The first four membrane-electrode units 30th and the four second membrane-electrode assemblies 50 be arranged such that the first cathodes 32 of the respective first membrane electrode units 30th the first partial interior 12th facing and the second anodes 51 of the respective second membrane-electrode units 50 the third part interior 14th is facing while the first anodes 31 of the respective first membrane electrode units 30th and the second cathodes 52 the second partial interior 13th are facing.

The cell arrangement according to the invention 100 out 1 can for example be designed as a combination of an electrolyzer and an electrochemical compressor. Here are the first four membrane-electrode units 30th each designed as an electrolyzer membrane electrode unit, while the four second membrane electrode units 50 is designed in each case as an electrochemical compressor-membrane-electrode unit. There are the first cathodes 32 and the second anodes 51 the second partial interior 13th facing. The water to be split becomes the first part of the interior 12th fed. The through the first electrode arrangement 20th in the second part of the interior 13th Hydrogen produced is generated directly by the second electrode assembly 40 condensed. The compressed hydrogen is then from the third partial interior 14th discharged.

Are the four second membrane electrode assemblies 50 each designed as an electrolyzer-membrane-electrode unit and the four first membrane-electrode units 30th each configured as an electrochemical compressor-membrane-electrode unit, that is to say that the second cathodes 52 and the first anodes 31 to the second partial interior 13th are facing, the water to be split is the third part interior 14th fed. The one by the second electrode arrangement 40 in the second part of the interior 13th Hydrogen generated is generated directly by the first electrode assembly 20th condensed. The compressed hydrogen is then from the first partial interior 12th discharged.

Other combinations are also possible. For example, the cell arrangement according to the invention 100 be designed as a combination of an electrolyzer and a fuel cell or as a combination of a fuel cell and an electrochemical compressor. In the latter case, the excess hydrogen can advantageously be compressed for further use.

In 2 is a first longitudinal section of the cell arrangement 100 in 1 shown schematically along a line AA. In 2 are two of the first four membrane-electrode assemblies 30th and two of the four second membrane electrode assemblies 50 out 1 shown.

The two first membrane-electrode assemblies shown 30th each have a first anode 31 and a first cathode 32 on that through a first membrane 33 are separated.

The two illustrated second membrane-electrode assemblies 50 each have a second anode 51 and a second cathode 52 on that through a second membrane 53 are separated.

Through the first and second electrode assemblies 20th , 40 is the interior 11 the cell arrangement according to the invention 100 in a first partial interior 12th , a second partial interior 13th and a third partial interior 14th divided. The first and second electrode assemblies 20th , 40 are designed in such a way that the first, second and third sub-interior 12th , 13th , 14th in the housing 10 are consistent.

In 3rd is a second longitudinal section of the cell arrangement 100 in 1 shown schematically along the line AA, the 3rd an alternative embodiment of the second and third partial interior 13th , 14th shows. In 3rd are two of the first four membrane-electrode assemblies 30th and two of the four second membrane electrode assemblies 50 out 1 shown.

The two first membrane-electrode assemblies shown 30th each have a first anode 31 and a first cathode 32 on that through a first membrane 33 are separated.

The two illustrated second membrane-electrode assemblies 50 each have a second anode 51 and a second cathode 52 on that through a second membrane 53 are separated.

Through the first and second electrode assemblies 20th , 40 is the interior 11 the cell arrangement according to the invention 100 in a first partial interior 12th , a second partial interior 13th and a third partial interior 14th divided. The first and second electrode assemblies 20th , 40 are designed in such a way that the second and third sub-interior 13th , 14th in the housing 10 are not continuous.

Further configuration of the first and the second electrode arrangement 20th , 40 but are also conceivable, for example only the first, only the second or only the third partial interior 12th , 13th , 14th in the housing 10 not consistently.

4th shows a schematic cross-sectional representation of a cell arrangement according to the invention 100 according to a second embodiment. The cell arrangement according to the invention comprises 100 two first electrode assemblies 20th and a second electrode assembly 40 , which are in a pressure-resistant housing 10 are arranged side by side. The case 10 and the first two electrode assemblies 20th and the second electrode assembly 40 each have a rectangular cross section. By the first two electrode arrangements 20th and the second electrode assembly 40 is an interior 11 the cell arrangement according to the invention 100 in four partial interiors 12th , 13th , 14th , 15th divided.

5 shows a schematic cross-sectional representation of a cell arrangement according to the invention 100 according to a third embodiment. The cell arrangement according to the invention comprises 100 two first electrode assemblies 20th and a second electrode assembly 40 . The case 10 and the left first electrode assembly 20a each have a rectangular cross section, while the middle first electrode arrangement 20b a round cross-section and the right second electrode arrangement 40 has a cruciform cross-section. By the first two electrode arrangements 20th and the second electrode assembly 40 is an interior 11 the cell arrangement according to the invention 100 in four partial interiors 12th , 13th , 14th , 15th divided.

The invention is not restricted to the exemplary embodiments described here and the aspects emphasized therein. Rather, a large number of modifications are possible within the range specified by the claims, which are within the scope of expert action.

Claims (10)

Cell arrangement (100), comprising a pressure-resistant housing (10), at least one first electrode arrangement (20) and at least one second electrical arrangement (40) arranged in the housing (10) being arranged in the housing (10), the at least one first electrode arrangement ( 20) has at least one first membrane electrode unit (30) with a first anode (31) and a first cathode (32), which are separated from one another by a first membrane (33), and wherein the at least one second electrical arrangement (40 ) has at least one second membrane-electrode unit (50) with a second anode (51) and a second cathode (52), which are separated from one another by a second membrane (53), characterized in that the at least one first and the at least one second electrode arrangement (20, 40) are cylindrical and closed in cross-section and that the at least one first membrane-electrode unit (30) has a first type and the at least ens a second membrane-electrode unit (50) has a second type, wherein the first type and the second type are each selected from a fuel cell, an electrolyzer and an electrochemical compressor membrane-electrode unit. Cell arrangement (100) according to Claim 1 , characterized in that the first type and the second type are different from each other. Cell arrangement (100) according to Claim 2 , characterized in that the at least one first membrane electrode unit (30) is designed as an electrolyzer membrane electrode unit, while the at least one second membrane electrode unit (50) is designed as an electrochemical compressor membrane electrode -Unit is designed, or the at least one first membrane-electrode unit (30) is designed as an electrochemical compressor membrane-electrode unit, while the at least one second membrane-electrode unit (50) as an electrolyzer membrane Electrode unit is designed. Cell arrangement (100) according to Claim 2 , characterized in that the at least one first membrane electrode unit (30) is designed as a fuel cell membrane electrode unit, while the at least one second membrane electrode unit (50) is designed as an electrochemical compressor membrane electrode Unit is designed, or the at least one first membrane-electrode unit (30) is designed as an electrochemical compressor-membrane-electrode unit, while the at least one second membrane-electrode unit (50) is designed as a fuel cell membrane Electrode unit is designed. Cell arrangement (100) according to one of the Claims 1 to 4th , characterized in that the housing (10), the at least one first and the at least one second electrode arrangement (20, 40) each have a round, oval or polygonal cross section. Cell arrangement (100) according to Claim 5 , characterized in that the cross section of the housing (10), the cross section of the at least one first electrode arrangement and the cross section of the at least one second electrode arrangement are each selected to be different. Cell arrangement (100) according to one of the Claims 1 to 6th , comprising several first electrode arrangements (20), characterized in that the several first electrode arrangements (20) are arranged coaxially to one another or next to one another in the housing (10). Cell arrangement (100) according to one of the Claims 1 to 7th , comprising several second electrode arrangements (40), characterized in that the several second electrode arrangements (40) are arranged coaxially to one another or next to one another in the housing (10). Cell arrangement (100) according to one of the Claims 1 to 8th , characterized in that the at least one first and the at least one second electrode arrangement (20, 40) are arranged coaxially to one another or next to one another in the housing (10). Motor vehicle having at least one cell arrangement (100) according to one of the Claims 1 to 9 includes.

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