EP4526940A2 - Medieneinsatz für eine vor korrosion und/oder erosion zu schützende platte einer brennstoffzellenanordnung sowie brennstoffzellenanordnung mit einem solchen medieneinsatz - Google Patents
Medieneinsatz für eine vor korrosion und/oder erosion zu schützende platte einer brennstoffzellenanordnung sowie brennstoffzellenanordnung mit einem solchen medieneinsatzInfo
- Publication number
- EP4526940A2 EP4526940A2 EP23723837.3A EP23723837A EP4526940A2 EP 4526940 A2 EP4526940 A2 EP 4526940A2 EP 23723837 A EP23723837 A EP 23723837A EP 4526940 A2 EP4526940 A2 EP 4526940A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- fuel cell
- plate
- sealing
- sleeve
- media
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/24—Grouping of fuel cells, e.g. stacking of fuel cells
- H01M8/2465—Details of groupings of fuel cells
- H01M8/2484—Details of groupings of fuel cells characterised by external manifolds
- H01M8/2485—Arrangements for sealing external manifolds; Arrangements for mounting external manifolds around a stack
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04082—Arrangements for control of reactant parameters, e.g. pressure or concentration
- H01M8/04201—Reactant storage and supply, e.g. means for feeding, pipes
Definitions
- the present invention relates to a media insert for sealing at least one plate of a fuel cell arrangement to be protected against corrosion and/or erosion, which contains at least a first operating media guide channel and a second operating media guide channel for a respective operating medium for operating the fuel cell arrangement, as well as a Fuel cell arrangement with at least one fuel cell stack, a media connection arrangement for operating media and a metallic plate arranged between them with such a media insert.
- Fuel cell arrangements typically have one or more fuel cell stacks in which several fuel cells connected electrically in series are arranged one above the other or next to one another (depending on the orientation of the stack in space).
- Fuel cells generate electrical energy from hydrogen as an anode operating gas and oxygen as a cathode operating gas. They also usually require a coolant, for example water or a glycol/water mixture, to cool the fuel cells and dissipate the heat output generated.
- a coolant for example water or a glycol/water mixture
- supply lines and discharge lines for anode operating gas e.g. hydrogen
- cathode operating gas oxygen or air
- coolant are brought to a fuel cell stack individually or collectively by means of a media connection arrangement, for example by means of a plate-like arrangement.
- the individual fuel cells within a fuel cell stack are combined into a stack using stable plates, for example clamped together.
- the current collector plate and end - plate can be combined, ie the end plates are at least partially made of a metallic material and at the same time serve to draw power and brace the fuel cell stack.
- the operating media introduced or removed by the media connection arrangement must be passed through such an end plate or current collector plate in order to supply the fuel cell stack.
- a metallic plate usually has several openings through which the respective operating media, such as hydrogen, air and coolant, can be supplied or removed to supply the fuel cell stack.
- Such operating medium guide channels in the form of such openings in a metallic plate should be protected from corrosion and/or erosion (material removal), which can be attempted by the respective operating medium.
- corrosion and/or erosion material removal
- easy handling of a sealing device to be provided for one or more of the operating media guide channels in the production of the fuel cell arrangement, and on the other hand, a reliable seal against the operating media to protect against corrosion and / or erosion of the metallic plate is desirable.
- Possible corrosion and/or erosion can occur not only in metallic panels, but also in panels made of plastic. Material erosion can, for example, result from washouts caused by the respective operating medium, which in turn can be harmful to the fuel cell stack if washed-out materials accumulate there.
- JP 4775534 B2 relates to a fuel cell assembly capable of preventing corrosion of a connection plate.
- a fuel cell consists of a switch plate 5, a terminal plate 7, an insulating plate 8 and an end plate 9 laminated in this order, and a feed channel 20 penetrating these four plates (5, 7, 8, 9) in a lamination direction.
- a sealing element 40 which, as a media insert, seals at least a gap between the switch-on plate 5 and the connection plate 7, is provided in such a way that it covers a peripheral surface of the feed channel 20 of the connection plate 7.
- the fuel cell arrangement has the disadvantage that not all of the plates provided are protected from possible corrosion and the sealing element has to be arranged in the plate arrangement in a comparatively complicated manner and installed in a complex manner.
- the invention relates to a media insert for at least one plate of a fuel cell arrangement to be protected against corrosion and/or erosion, as well as a fuel cell arrangement according to the attached patent claims.
- Advantageous training and further education are specified in the dependent claims.
- the invention relates to a media insert for at least one plate of a fuel cell arrangement to be protected against corrosion and/or erosion, which contains at least a first operating media guide channel and a second operating media guide channel for a respective operating media guide for operating the fuel cell arrangement.
- the media insert has a first sleeve-shaped area made of elastic material for arranging and sealing operating media in the first operating media guide channel and a second sleeve-shaped area made of elastic material for arranging and sealing operating media in the second operating media guide channel of the plate, as well as a connection area that connects the first and second sleeve-shaped area and between the first sleeve-shaped region and the second sleeve-shaped region is designed to be flat so as to rest against a surface of the plate.
- Each of the first and second sleeve-shaped areas has a front-side first sealing area made of elastic material, which is designed to seal a respective operating media guide at a first joint between the plate and a media connection arrangement, and a second sealing area made of elastic material opposite the first sealing area, which is used for Sealing of a respective operating media guide is formed on a second joint opposite the first joint between the plate and a fuel cell stack of the fuel cell arrangement.
- the invention relates to a fuel cell arrangement, which has at least one fuel cell stack, a media connection arrangement with connections for supplying the fuel cell arrangement with operating media for operating the fuel cell arrangement, and at least one plate to be protected against corrosion and / or erosion, which is arranged between the fuel cell stack and the media connection arrangement and contains at least a first operating media guide channel and a second operating media guide channel for a respective operating media guide for operating the fuel cell arrangement.
- the fuel cell arrangement has a media insert with a first sleeve-shaped region made of elastic material, which is arranged in the first operating media guide channel of the plate for operating media sealing, a second sleeve-shaped region made of elastic material, which is arranged in the second operating media guide channel of the plate for operating medium sealing, and a connection area which connects the first and second sleeve-shaped area and is flat between the first sleeve-shaped area and the second sleeve-shaped area and rests on a surface of the plate.
- Each of the first and second sleeve-shaped areas has a front-side first sealing area made of elastic material, which seals the respective operating media guide at a first joint between the plate and the media connection arrangement, and a second sealing area made of elastic material opposite the first sealing area and which seals the respective operating media guide a second joint between the plate and the fuel cell stack (in particular an edge plate of the fuel cell stack).
- the media insert further has a third sleeve-shaped region made of elastic material for arranging and sealing operating media in a third operating media guide channel of the plate 30, the connecting region comprising the first, second and third sleeve-shaped
- the plate has at least one geometric shape on at least one of the first, second and third operating media guide channels, by means of which the media insert is held in a fixed position in the plate, the at least one geometric shape having at least one elevation, depression, and/or or has an undercut.
- the at least one elevation can be designed as one or more steps, the at least one depression as one or more grooves.
- At least one of the first, second and third sleeve-shaped regions of the media insert has at least one change in cross-section along its longitudinal extent.
- the media insert in at least one of the first, second and third sleeve-shaped regions has an external dimension, in particular an external diameter, which is smaller with an offset than an internal dimension, particularly an internal diameter, of the corresponding first, second and third Operating media guide channel of the disk.
- At least one of the first sealing area and second sealing area is designed according to the principle of self-reinforcement.
- a respective sealing device is provided, the sealing effect of which increases as a result of the pressure exerted by the respective operating medium.
- a sealing ring is pressed against the plate or the fuel cell stack. The pressure inside the respective channel, exerted by the corresponding pressurized operating medium, can further strengthen the sealing effect of the sealing ring.
- FIG. 1 shows a fuel cell arrangement and a media insert according to an embodiment of the invention in a schematic exploded view
- 2 shows a top view of an embodiment of a fuel cell arrangement according to FIG. 1 with a view of the media connection arrangement
- FIG. 3 shows a sectional view through an embodiment of a fuel cell arrangement according to FIG. 1 along the section line AA according to FIG. 2;
- FIG. 4 shows a detailed view of an embodiment of a fuel cell arrangement according to FIG. 1 in a detail B according to FIG. 3.
- the fuel cell arrangement 1 shows a fuel cell arrangement according to an embodiment of the invention in a schematic exploded view.
- the fuel cell arrangement 1 has at least one fuel cell stack 5, in which individual fuel cells (not shown) are combined to form a stack. This can be done in different ways in a known manner.
- the fuel cell stack has 50 or more fuel cells.
- Each fuel cell of the fuel cell stack 50 has, for example, a membrane electrode
- the fuel cell arrangement 1 is delimited on both sides by end plates 4 and 6 and is clamped together with their help, for example using tie rods (not shown).
- the end plate 4 is an end plate with openings for operating media, as explained in more detail below, while the end plate 6 is an end plate without openings. Connections (not shown) on the end plates 4, 6 or on current collector plates adjacent to the end plates 4, 6 are used to collect electricity from the fuel cell stack 5.
- the end plate 6 can be arranged on the fuel cell stack 5 by means of respective rear seals 7.
- fresh anode operating gas for example hydrogen
- an anode operating gas source not shown
- the gas flows, for example, from connection 55 or 56 (hidden in FIG. 1 ) to connection 35 or 36, where it leaves the media connection arrangement 3.
- An analog operating gas routing takes place via the corresponding remaining connections 31-36 and 51-56 in relation to the cathode operating gas (eg air) and in relation to the coolant, for example cooling water.
- the end plate 4 is provided between the media connection arrangement 3 and the fuel cell stack 5.
- the operating media guide channels 41 to 46 which are correspondingly assigned and aligned in position and arrangement to the connections 31-36 of the median connection arrangement 3 or the connections 51-56 of the fuel cell stack 5.
- the operating medium guide channels 41-46 each serve to guide a respective operating medium for operating the fuel cell arrangement 1, i.e. in the present example for guiding or passing through anode operating gas, cathode operating gas and coolant.
- the described operating media connections and channels in terms of shape, number and arrangement in relation to the median connection arrangement 3, end plate 4 and fuel cell stack 5 as well as in relation to the flow direction of the respective operating medium are only examples and also other geometric shapes (e.g. not circular) , number and arrangement as well as flow directions.
- a coolant connection can be dispensed with and/or air cooling from outside can be used.
- Individual operating media can also be supplied in a different way than shown in the fuel cell arrangement 1, for example via respective individual connections outside the media connection arrangement 3.
- Such connection and line types of operating media shown in FIG. 1 are known to those skilled in the art in various ways.
- the operating medium guide channels 41-46 (hereinafter referred to as channels), which are designed here as openings or breakthroughs in the end plate 4, should be protected from any corrosion and/or erosion caused by the respective operating medium in the course of operation of the fuel cell arrangement over time. to be protected.
- corrosion and/or erosion can occur to varying degrees depending on the material properties and/or composition of the plate 4 and the respective operating medium (e.g. quality, composition, pressure).
- the present invention provides a media insert made of elastic material, which in the present exemplary embodiment is designed in two ways, namely in the form of a media insert 101 for the channels 41-43 and a media insert 102 for the channels 44-46.
- the media inserts 101 and 102 are essentially the same, differing only in the distance between the sleeve-shaped areas 11, 12, 13 from one another.
- the sleeve-shaped areas 11, 12 are arranged at a shorter distance from one another, corresponding to the channels 41, 42 (FIG. 1), while in the media insert 102, the sleeve-shaped areas 12, 13 are arranged at a shorter distance from one another, corresponding to the channels 45, 46 (Fig. 3).
- This distance does not play an essential role in the function of the media inserts, but only serves to adapt to the arrangement and the distance between the channels 41-46, so that in the following only reference will be made to one of the media inserts 101, 102 and the same applies to the respective other media use.
- a media insert with three sleeve-shaped areas 11, 12, 13 is described for the exemplary operating fluids hydrogen, air and coolant.
- more or fewer connections for operating resources of the fuel cell arrangement 1 can also be provided.
- the number of sleeve-shaped areas can also be different.
- a media insert has only two sleeve-shaped areas, approximately 11 and 13, for example for the operating resources hydrogen and air, which are connected to one another via the connection area 15.
- FIGS. 1 to 3 A structure and function of a media insert according to the invention in an embodiment of a fuel cell arrangement of the invention will be described in more detail below with reference to the embodiments of FIGS. 1 to 3:
- the media insert 101, 102 has a first sleeve-shaped area 11, which is arranged in the channel 41 or 44 of the end plate 4, a second sleeve-shaped area 13, which is arranged in the channel 43 or 46 of the end plate 4, and a third sleeve-shaped region 12, which is arranged in the channel 42 or 45 of the end plate 4.
- the sleeve-shaped areas 11, 12, 13 are each made of an elastic material, such as silicone and/or EPDM (known abbreviation for Ethylene-propylene-diene (monomer) rubber), and serve to seal the operating media (ie sealing against the operating media that are guided in the respective channel) of the respective channel inner surfaces to avoid corrosion and/or erosion.
- corrosion can occur if this or the plate is metallic.
- Metallic means that the plate or the respective inner channel surfaces at least partially have a metallic material.
- Possible corrosion and/or erosion can occur not only in metallic panels, but also in panels made of plastic. Material erosion can, for example, result from washouts caused by the respective operating medium, which in turn can be harmful to the fuel cell stack if washed-out materials accumulate there.
- connection area 15 which can also be made of silicone and/or EPDM.
- the connection area 15 is arranged between the areas 11, 12 and 12, 13. And in these sections, at least in some areas, it is flat and lies against a surface 48 of the end plate 4.
- a flat or compact arrangement of media insert 101, 102 and end plate 4 is therefore possible without the media insert 101, 102 contributing significantly to increasing the thickness of the fuel cell arrangement 1.
- the media insert 101, 102 is inserted, for example, as an integrated component from one side of the end plate 4 into the respective channels 41-46 and, due to its elasticity and shape, as described in more detail below, is arranged in the end plate without additional fastening means separate from the end plate specified therein.
- Each of the sleeve-shaped areas 11 to 13 has a front-side first sealing area 21, which seals the respective operating media guide at a first joint 81 between the end plate 4 and the media connection arrangement 3, and a second sealing area 22 opposite the first sealing area 21, which seals the respective Operating media guide seals at a second joint 82 between the end plate 4 and the fuel cell stack 5.
- Both sealing areas 21, 22 are made of elastic material, for example silicone and/or EPDM.
- the first sealing area 21 is formed by a sealing flange 25 which rests on a facing surface 37 of the media connection arrangement 3.
- the sealing flange 25 can be for example, be annular and have a larger diameter and outer circumference than the adjacent sleeve-shaped area 11, 12 or 13.
- the sealing flange 25 is designed such that it has a geometric shape in the end plate on the corresponding channel or
- Breakthrough is adapted.
- at least one geometric shape 47 is provided in the respective channel (shown as an example in channel 44 according to FIG. 4), by means of which the media insert 101, 102 is held in a fixed position in the end plate 4.
- the geometric shape 47 is designed as one or more depressions, here a groove, in which the sealing flange 25 is arranged.
- other geometric shapes are also possible, such as one or more elevations (eg steps) and/or undercuts, which, like the groove 47, support fixation of the media insert in the respective channel.
- elevations eg steps
- undercuts which, like the groove 47, support fixation of the media insert in the respective channel.
- the at least one geometric formation 47 here in the form of a recess, is designed such that at least part of the sealing flange 25 is compressed in a manner defined by the geometric formation 47.
- the sealing function is promoted and defined by a defined compression. In the embodiment shown, compression takes place in a pressure zone DR.
- a defined compression of the sealing areas 21, 22 can be produced, for example, by respective tie rods (not shown) with which the end plates 4, 6 of the fuel cell arrangement 1 are clamped together.
- the second sealing area 22, which in the present embodiment is formed by at least a section of the connection area 15, which rests on the one hand on a surface 58 of the fuel cell stack 5 and on the other hand on a surface 48 of the end plate 4.
- the surface 58 of the fuel cell stack is formed, for example, by an edge plate of the fuel cell stack 5 (not shown). Such an edge plate closes the outermost fuel cell (edge cell) of the fuel cell stack 5 to the outside (here on the side of the end plate 4).
- An edge plate has a flow channel structure for a cathode or anode flow field on its surface facing inside the fuel cell stack 5.
- one or more geometric shapes 47 can be provided according to one or more of the types described, which support the fixation of the media insert on the end plate 4. The same applies to the elastic material in the sealing area 22 compressed in a pressure zone DR to achieve an improved seal and improved fit in the end plate 4.
- the media insert is arranged in the end plate 4 in such a way that the elastic material of the respective first, second and third sleeve-shaped area between the first and second sealing areas 21, 22 is stretched and placed under tensile stress. This in turn also promotes the fixation in the end plate 4, regardless of the geometric shape 47.
- the respective sleeve-shaped area is placed under tensile stress in a respective tensile area Z, favored by the elastic material from which it is made.
- the expansion of the elastic material is caused by an overlap (so-called offset) d2 of the first sealing area 21 of the media insert with an end wall of the corresponding channel (here 44) of the end plate 4, which is in the final arrangement of the media insert in the End plate 4 is compensated for by the expansion.
- Fig. 4 shows a graphical state in which the sealing flange 25 and the end wall of the channel 44 overlap in order to illustrate the principle of insertion and material displacement under expansion and tensile stress.
- the sealing flange 25 and the end wall of the channel lie flat against one another.
- a comparable overlap can also be provided on the side of the sealing area 22.
- a defined, firm fit achieved in this way counteracts flexing movements in turbulent flows, for example.
- the media insert in the sleeve-shaped area 11, 12 or 13 has an external dimension, in particular an external diameter with a round shape, which has an offset d1 (so-called Offset) is smaller than an inner dimension, in particular an inner diameter, of the corresponding channel of the end plate 4.
- offset is smaller than an inner dimension, in particular an inner diameter, of the corresponding channel of the end plate 4.
- the cross section changes along the respective wavy sleeve-shaped area from, for example, a smaller to a larger cross section.
- the cross section can also change in shape along the longitudinal extent of at least one of the sleeve-shaped regions 11, 12, 13, for example from a circular to an elliptical shape.
- a further embodiment of the invention which is not shown in the figures, provides that at least one of the sealing areas 21, 22 has a first sealing device and a second sealing device, for example in the form of respective sealing lips or sealing rings.
- the second sealing device is provided redundantly to the first sealing device and only takes on a sealing function if the first sealing device is faulty. In this way, so-called cold redundancy can be achieved when sealing the joints.
- an improved media insert and an improved fuel cell arrangement are thus provided, with which not only a plate, such as an end plate, of the fuel cell arrangement, which can at least partially have metallic and/or plastic material, is effectively protected against corrosion and/or erosion , but also an elastomer seal attached to both sides of the plate.
- the media insert extends from the edge plate of the fuel cell stack to the media connection arrangement.
- the media insert is manufactured, for example, by injection molding.
- the elastic material is preferably a silicone or EPDM material or a mixture of these.
- the media insert can be manually pressed into the plate without separate fastening aids (such as screws, adhesive, etc.) and remains in a fixed position relative to and in the plate due to its geometric shape.
- the media insert can function as a seal on both sides of the plate at the same time.
- an effective protective covering / sealing of all three operating media described (hydrogen, coolant, air) or two media (hydrogen , air) and the openings in the plate from media and thus achieve effective corrosion and/or erosion protection with the use of media.
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Fuel Cell (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102022112575.0A DE102022112575A1 (de) | 2022-05-19 | 2022-05-19 | Medieneinsatz für eine vor Korrosion und/oder Erosion zu schützende Platte einer Brennstoffzellenanordnung sowie Brennstoffzellenanordnung mit einem solchen Medieneinsatz |
| PCT/EP2023/061014 WO2023222351A2 (de) | 2022-05-19 | 2023-04-26 | Medieneinsatz für eine vor korrosion und/oder erosion zu schützende platte einer brennstoffzellenanordnung sowie brennstoffzellenanordnung mit einem solchen medieneinsatz |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4526940A2 true EP4526940A2 (de) | 2025-03-26 |
Family
ID=86383176
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP23723837.3A Withdrawn EP4526940A2 (de) | 2022-05-19 | 2023-04-26 | Medieneinsatz für eine vor korrosion und/oder erosion zu schützende platte einer brennstoffzellenanordnung sowie brennstoffzellenanordnung mit einem solchen medieneinsatz |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP4526940A2 (de) |
| DE (1) | DE102022112575A1 (de) |
| WO (1) | WO2023222351A2 (de) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000164238A (ja) | 1998-11-24 | 2000-06-16 | Aisin Seiki Co Ltd | 燃料電池 |
| CA2401915C (en) * | 2001-09-11 | 2007-01-09 | Matsushita Electric Industrial Co., Ltd. | Polymer elecrolyte fuel cell |
| JP4775534B2 (ja) | 2004-07-05 | 2011-09-21 | トヨタ自動車株式会社 | 燃料電池 |
| JP4653978B2 (ja) * | 2004-08-05 | 2011-03-16 | 本田技研工業株式会社 | 燃料電池スタック |
| JP2010165635A (ja) | 2009-01-19 | 2010-07-29 | Toyota Motor Corp | 燃料電池セルとその組付方法並びに燃料電池セルガスケット組付装置 |
| US11217814B2 (en) * | 2015-10-06 | 2022-01-04 | Honda Motor Co., Ltd. | Fuel battery stack |
| JP6437963B2 (ja) * | 2016-07-26 | 2018-12-12 | トヨタ自動車株式会社 | 燃料電池スタック |
-
2022
- 2022-05-19 DE DE102022112575.0A patent/DE102022112575A1/de active Pending
-
2023
- 2023-04-26 EP EP23723837.3A patent/EP4526940A2/de not_active Withdrawn
- 2023-04-26 WO PCT/EP2023/061014 patent/WO2023222351A2/de not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| WO2023222351A3 (de) | 2024-06-13 |
| DE102022112575A1 (de) | 2023-11-23 |
| WO2023222351A2 (de) | 2023-11-23 |
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