US20160079615A1 - Water transfer compound - Google Patents
Water transfer compound Download PDFInfo
- Publication number
- US20160079615A1 US20160079615A1 US14/392,093 US201414392093A US2016079615A1 US 20160079615 A1 US20160079615 A1 US 20160079615A1 US 201414392093 A US201414392093 A US 201414392093A US 2016079615 A1 US2016079615 A1 US 2016079615A1
- Authority
- US
- United States
- Prior art keywords
- water transfer
- overlapping area
- compound according
- compound
- flow plate
- 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.)
- Abandoned
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 168
- 150000001875 compounds Chemical class 0.000 title claims abstract description 145
- 239000007789 gas Substances 0.000 claims abstract description 72
- 229920001169 thermoplastic Polymers 0.000 claims abstract description 69
- 239000004416 thermosoftening plastic Substances 0.000 claims abstract description 69
- 238000000034 method Methods 0.000 claims abstract description 22
- 239000000446 fuel Substances 0.000 claims abstract description 21
- 230000008569 process Effects 0.000 claims abstract description 16
- 239000012528 membrane Substances 0.000 claims description 28
- 239000000463 material Substances 0.000 claims description 25
- 238000007789 sealing Methods 0.000 claims description 21
- -1 polypropylene Polymers 0.000 claims description 11
- 239000000835 fiber Substances 0.000 claims description 8
- 239000000853 adhesive Substances 0.000 claims description 5
- 230000001070 adhesive effect Effects 0.000 claims description 5
- 239000004743 Polypropylene Substances 0.000 claims description 3
- 239000007769 metal material Substances 0.000 claims description 3
- 229920001155 polypropylene Polymers 0.000 claims description 3
- 239000002033 PVDF binder Substances 0.000 claims description 2
- 239000004698 Polyethylene Substances 0.000 claims description 2
- 229920001707 polybutylene terephthalate Polymers 0.000 claims description 2
- 229920000728 polyester Polymers 0.000 claims description 2
- 229920000573 polyethylene Polymers 0.000 claims description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 2
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 2
- 229920006375 polyphtalamide Polymers 0.000 claims description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 2
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 2
- 229920001187 thermosetting polymer Polymers 0.000 claims description 2
- 150000002500 ions Chemical class 0.000 claims 1
- 239000010410 layer Substances 0.000 description 115
- 238000004519 manufacturing process Methods 0.000 description 21
- 238000005520 cutting process Methods 0.000 description 19
- 239000011241 protective layer Substances 0.000 description 6
- 230000007704 transition Effects 0.000 description 6
- 238000005470 impregnation Methods 0.000 description 5
- 238000004026 adhesive bonding Methods 0.000 description 4
- 230000000295 complement effect Effects 0.000 description 4
- 238000010924 continuous production Methods 0.000 description 4
- 238000009792 diffusion process Methods 0.000 description 4
- 238000004080 punching Methods 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000003698 laser cutting Methods 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000000109 continuous material Substances 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000001815 facial effect Effects 0.000 description 2
- 229920000554 ionomer Polymers 0.000 description 2
- 235000021190 leftovers Nutrition 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000005518 polymer electrolyte Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229920000544 Gore-Tex Polymers 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229920000557 Nafion® Polymers 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 238000009957 hemming Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000037361 pathway Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
Images
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
- H01M8/04—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
- H01M8/04089—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants
- H01M8/04119—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants with simultaneous supply or evacuation of electrolyte; Humidifying or dehumidifying
- H01M8/04126—Humidifying
- H01M8/04149—Humidifying by diffusion, e.g. making use of membranes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
- B32B37/16—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with all layers existing as coherent layers before laminating
- B32B37/18—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with all layers existing as coherent layers before laminating involving the assembly of discrete sheets or panels only
- B32B37/182—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with all layers existing as coherent layers before laminating involving the assembly of discrete sheets or panels only one or more of the layers being plastic
- B32B37/185—Laminating sheets, panels or inserts between two discrete plastic layers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
- B32B37/16—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with all layers existing as coherent layers before laminating
- B32B37/20—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with all layers existing as coherent layers before laminating involving the assembly of continuous webs only
- B32B37/203—One or more of the layers being plastic
- B32B37/206—Laminating a continuous layer between two continuous plastic layers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/0004—Cutting, tearing or severing, e.g. bursting; Cutter details
-
- 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
- H01M8/04089—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants
- H01M8/04119—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants with simultaneous supply or evacuation of electrolyte; Humidifying or dehumidifying
- H01M8/04126—Humidifying
- H01M8/04141—Humidifying by water containing exhaust gases
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
- Y10T156/10—Methods of surface bonding and/or assembly therefor
- Y10T156/1052—Methods of surface bonding and/or assembly therefor with cutting, punching, tearing or severing
- Y10T156/1062—Prior to assembly
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
- Y10T156/10—Methods of surface bonding and/or assembly therefor
- Y10T156/1052—Methods of surface bonding and/or assembly therefor with cutting, punching, tearing or severing
- Y10T156/1084—Methods of surface bonding and/or assembly therefor with cutting, punching, tearing or severing of continuous or running length bonded web
- Y10T156/1085—One web only
Definitions
- the present invention relates to a water transfer compound, a humidifier module, a humidifier as well as a device for the production of a water transfer compound.
- the water transfer compound can preferably be used for the humidification of process gases for fuel cells.
- Fuel cells among others use gaseous process media, such as molecular hydrogen and oxygen for producing electrical current.
- Such fuel cells usually use polymer-electrolyte membranes (PEM). During operation, such a PEM heats up to 80 or 90° C. It is important for the degree of efficiency of a fuel cell as well as for the durability of the PEM that relatively stationary conditions are given in the area of the PEM both with respect to temperature and humidity. In particular, drying-out of the PEM can have a negative impact on the durability and the degree of efficiency of the fuel cell.
- PEM polymer-electrolyte membranes
- humidifiers are known in which a water-permeable membrane is arranged between two flow plates comprising flow channels. This water-permeable membrane or water transfer layer separates a dry gas stream which is to be humidified on its one side and a gas stream which needs to be dehumidified on its other side.
- thermoplastic protective layers are used for the protection of these fragile membranes, their porosity impedes a grasping and positioning using the vacuum gripping systems usually used in automatized processes. Due to this, positioning procedures become very complex and even with the slightest imprecision leakages can occur, e.g. caused by folded or wrongly inserted membranes.
- this is a water-transfer compound, in particular for the use for the humidification of process gases for fuel cells, comprising:
- the water transfer layer as well as the thermoplastic protection layer or layers, respectively are arranged so that they overlap at least partially. This does however not mean that these need to have congruent outer edges. Here, it is only required that an overlap is present at all.
- This overlap according to the invention has two areas, a first and a second overlapping area.
- thermoplastic protection layer as it is given in the water transfer compound at least in sections needs to be water and gas permeable in order to allow a realization of the invention.
- the thermoplastic protection layer In the second overlapping area, which is thermocompressed, the thermoplastic protection layer is compressed in such a way that it is non-permeable for gases, especially humid gases, and therefore the water transfer layer situated subjacent the thermoplastic protection layer is not accessible for humid gases.
- the thermoplastic protection layer compressed as described is impermeable for water and gases, preferably both in the direction of its plane as well as transversely to the direction of its plane.
- the subjacent water transfer layer on its entire face is at least not permeable for gases, but permeable for liquids. This is especially true transversely to the face.
- a hot roll or stamp is applied to the areas to be connected using pressure.
- typical pressures used are 0.1 to 5 MPa, preferably 0.8 to 2 MPa with typical temperatures of 150° to 300° C., preferably 220 to 270° C.
- the exact conditions to be used will also depend on the particular material used.
- thermoplastic protection layers are provided on both sides of the water transfer layer. This allows an exceptional protection of the water transfer layer as the latter with this means is protected on both sides. It shall however be emphasized that this three-layered arrangement is not compulsive for the invention; two-layered arrangements as well as arrangements with further layers or additional intermediate layers, respectively, are also covered by the invention.
- An advantageous variant provides that the second overlapping area shows a reduced thickness compared to the first overlapping area.
- the smallest thickness is here accepted to be the thickness of the second overlapping area as one can assume that this area is impermeable for humid gas.
- the thickness of the first overlapping area is adopted as the largest thickness of the first overlapping area.
- various variants of the layer thickness will be given in a transition area in which the thickness increases steadily from the second overlapping area to the first overlapping area. In this transition area, humid gas can still permeate at least to some extent.
- this transition area in the present description is considered to be part of the first overlapping area.
- a further embodiment provides that the second overlapping area delimits the first overlapping area at least at two longitudinal edges of the first overlapping area. This is particularly advantageous if an assembly of coil-material is realized in order to obtain a continuous water transfer compound. In this case a separation of individual segments can then be realized, e.g. transversely to the longitudinal edges of the coil.
- the second overlapping area delimits the first overlapping area circumferentially. This way, a lateral sealing of the so-called active area of the water-transfer compound can also be achieved in an easier way.
- the thickness in the first overlapping area amounts to between 35 and 600 ⁇ m and that the thickness in the second overlapping area corresponds to 10 to 75%, preferably to 20 to 50% of the thickness of the first overlapping area.
- the thickness strongly depends on whether only one or two thermoplastic protective layers are present.
- the thickness of an individual thermoplastic protective layer in the first overlapping area in general corresponds to between 30 and 250 ⁇ m, preferably between 80 and 110 ⁇ m.
- the thickness of the water transfer layer in the first overlapping area generally corresponds to between 8 and 30 ⁇ m, preferably between 15 and 30 ⁇ m.
- thermoplastic protection layer in the first overlapping area is porous and has a porosity of preferably 50 to 95%.
- the porosity here allows for a diffusion of humid gases through the thermoplastic protection layer to the water transfer layer.
- the porosity is here considered in the area of the thermoplastic protection layer which has neither been thermally nor mechanically influenced by thermocompression; thus, not in the transition area towards the second overlapping area.
- a further advantageous embodiment provides that the thermoplastic protection layer in the second overlapping area is essentially non-porous, thus the density of the thermoplastic protection layer in this area is higher than in the above-mentioned porous area of the first overlapping area.
- An embodiment provides that in the second overlapping area, openings are cut out, punched out or introduced by laser. This relates to so-called inner areas which are entirely surrounded by the second overlapping area. It is however also possible—either alternatively or additionally—that the outer edges of the water transfer compound at least in sections in or at the second overlapping area are cut out, punched out or reshaped by laser.
- the water-transfer layer is realized as a non-reinforced membrane, which can rest on a support medium.
- thermoplastic fiber papers, fiber rovings, fleece or fiber weave with polymeric fibers can be used.
- the water transfer layer is realized as a reinforced membrane.
- thermoplastic protective layer comprises polyester, polypropylene, polyethylene, polyvinylidene fluoride, polytetrafluorethylene, polyphtalamide, polyethylene terephthalate and/or polybutylene terephthalate or consists of such.
- thermoplastic protective layers can also be made from a layering of these materials or comprise a mixture of these materials.
- the water transfer layer is realized as a porous medium, as a coated and/or impregnated weave (Texapore®, Venturi®), as a membrane laminate (Goretex®), as a membrane impregnated with ionomers, as a polymer electrolyte membrane (Nafion®), as a hydrophilic membrane or as a diaphragm.
- Texapore®, Venturi® coated and/or impregnated weave
- Goretex® membrane laminate
- ionomers as a polymer electrolyte membrane
- Nafion® polymer electrolyte membrane
- hydrophilic membrane or as a diaphragm hydrophilic membrane
- the invention further relates to a humidifier module, in particular for the humidification of process gases of fuel cells, which comprise at least a first as well as a second flow plate as well as a water transfer compound as described above arranged between the first and second flow plate, where the first and second flow plate each comprise channel structures for the guidance of gases.
- the water transfer compound in its second overlapping area at least in sections is adhesively bonded to a first and/or second flow plate. This way, sealing of the humidifier module can be ascertained. Moreover, this arrangement is even less sensitive against mechanical stress and bending, respectively, compared to the unprotected water transfer compound mentioned beforehand.
- the adhesive connection is arranged at least in sections in the outer edge area of the water transfer compound and/or of the first and/or second flow plate. Gluing, melting, welding and in particular ultra-sonic welding lend themselves for this connection between flow plates and the water transfer compound.
- first and/or second flow plate comprise a sealing area which surrounds the channel structures.
- the water transfer compound is connected in a force fit manner to the first and/or second flow plate by placing it on the sealing area.
- first and the second flow plate again show a sealing area surrounding the channel structures.
- structures are incorporated in both flow plates which are at least in part complementary to each other, e.g. comparable to a tongue and groove connection.
- the flow plates can be connected to each other using these complementary structures. Leak tightness can be achieved by clamping the water transfer compound between the complementary structures. It is preferred that the compressed, second overlapping area is clamped between these structures.
- the connection is realized as a positive fit and force fit.
- the complementary structures are designed such that the shapes do only optimally fit once the water transfer compound has been received.
- first and/or second flow plate of a humidifier module comprise openings for the guidance of media in the direction of the stack, which openings overlap at least in sections with the openings in the second overlapping area of the water transfer compound.
- first and/or second flow plate comprise openings for the guidance of media in the stack direction but that all these openings for media guidance are arranged outside that section of the respective flow plate which is covered by the water transfer compound.
- the outer contour of the water transfer compound is smaller than in the preceding embodiment, thus it allows saving material.
- flow plates at least in sections are produced from thermoplastic, elastomeric or thermoset plastics and/or consist at least in sections in corrosion-stable metallic material.
- An embodiment provides that the first overlapping area of the water transfer compound at least in sections overlaps with the channel structures of the first and second flow plate. With this, it is ascertained that the humidity passing through the water transfer layer is guided to the desired channels and that in their further pathway they reach the corresponding outlets of the humidifier module.
- first and second flow plate are different from each other in at least one of choice of material, form of channels, direction of channels and sealing contour. This can be advantageous as the guidance of media can be easily realized through a predetermined course of different flow plates. It shall however explicitly not be excluded for the structures of the flow plates to be identical.
- a variant can be advantageous in which flow plates with geometry A and flow plates with geometry B are given and in which the layering of flow plates has the sequence A-B-A-B etc.
- the layering of flow plates has the sequence A-B-A-B etc.
- A-B-A-B it is advantageous if on both sides of plate A, humid gas flows into the channel structure in order to be humidified and that on both sides of plate B, humid gas enters into the flow channels. Then, it is preferable that one water transfer compound is arranged between all flow plates.
- the invention also relates to a humidifier, in particular for the humidification of process gas for fuel cells, comprising:
- Such a humidifier is advantageously connectible to a fuel cell system. This way, a humidifier can be provided which is producible cost-efficiently and at large scale, which humidifier provides fuel cell systems with process gases humidified to the degree required.
- the invention in addition relates to a device for the production of a water transfer compound, of a humidifier module and/or of a humidifier, comprising:
- the arrangement may thus work continuously or discontinuously, it is only important that a thermocompression of at least two layers is realized in order to obtain the first and second overlapping areas mentioned beforehand with their properties according to the invention.
- An embodiment provides that the arrangement for the continuous or discontinuous supply is designed in such a way that the water transport layer is fed between the two porous thermoplastic protection layers. This is the preferred variant; nevertheless, variations with a different number of layers, as already mentioned above, are possible, too.
- An embodiment provides that the continuous supply is realized using coils.
- the water transfer layer and the thermoplastic protection layers, respectively, are available at a large industrial scale as a coil material. This way, it is easy to produce a water transfer compound in continuous form.
- blanks of the individual materials can be employed to be overlapped before the thermocompression in order to form the assembly.
- One embodiment of this alternative approach is realized in such a way that the respective blanks are covered with a peel-off film and stored before they are overlapped with each other.
- thermocompression is only realized in areas, preferably in discrete areas, but that no full-face lamination takes place.
- the thermocompression of the discrete areas can for instance be realized using a frame-shaped stamp.
- the thermocompression in the longitudinal direction is realized as a continuous process using heated rolls, while the thermocompression in the transverse direction is realized as a discrete process using a single or several heated stamps. If several stamps, e.g. two stamps, are used, it is preferred that they are oriented essentially parallel to each other.
- Thermocompression adjacent to the longitudinal edge of the material can be realized with the different layers being fed one upon the other with flat, open outer edges, where the edge of the water transfer layer may be flush with the edge of the porous thermoplastic protection layer(s) or extend beyond this edge or be distanced to this edge.
- the edge of the water transfer layer may be flush with the edge of the porous thermoplastic protection layer(s) or extend beyond this edge or be distanced to this edge.
- an advantageous variant provides that both lateral outer edges of a first one of the porous thermoplastic protection layers are folded around the lateral outer edges of the water transfer layer and that in a consecutive step, the lateral outer edges of the second one of the porous thermoplastic protection layers are folded around the hem produced this way.
- an intermediate thermocompression is realized with only two layers folded this way and that a second thermocompression step is realized once both foldings have been completed. This provides the advantage that the intermediate hem is flattened before the third layer is folded around.
- a single thermocompression step can be realized once the hemming has been completed.
- the device additionally comprises a cutting arrangement for the cutting of the thermocompressed water transfer compound, in particular for the cutting of its edges as well as for the production of openings. This is advantageously realized using laser or by cutting or punching dies.
- thermocompression and the cutting of the openings and/or the cutting of the edges is realized in a single working station.
- thermocompression with a simultaneous cutting using a punching die or cutting knives can have advantages as the sequence of the process is optimized.
- the assembly device additionally comprises a stacking arrangement, which is designed for the stacking of the water transfer compound and of the flow plates in a predetermined order.
- the water transfer compound and the flow plates may have the same size or a different one. This way, the corresponding stacks may “grow”.
- the supply of the flow plates may for instance be realized laterally using suited robot arms. Doing so, the supply of the water transfer compound is considerably facilitated compared to a supply of the individual layers.
- the gripping and positioning is facilitated as the gas tightness of the water transfer layer enables the water transfer compound to be caught by a vacuum gripper without a negative impact resulting from the porosity of the thermoplastic protection layer.
- a particular design of this assembly device comprises at least the following arrangements:
- the separated sections of the water transfer compound can be easily removed from the cutting station using a vacuum gripper and be either directly or indirectly transported to the stacking or connecting station for the humidifier modules.
- the separated sections of the water transfer compound are advantageously collected in a large number and later on, this collection of ready-made water transfer compounds is fed to a stacking- or connecting station which is advantageously spatially separated from the other stations.
- thermoplastic protection layer which is the same as the thermoplastic protection layer, the water transfer layer and the other thermoplastic protection layer mentioned above
- a hot stamp or coining roll acting from one or both sides welds the compound in the edge region facially and gas tight. Doing so, the thermoplastic diffusion medium is melted and compressed and in this way, the porosity of these layers is eliminated in the regions treated, thus in the welded areas.
- a flat, mainly smooth edge structure results which fixes the membrane located in the center of the compound. Moreover, the edge structure becomes adhesively bonded to the membrane and therefore protects the fragile membrane from mechanical stress.
- an ideal area for the sealing of the membrane or for the application of a gluing to the flow plate is formed.
- the contour of the compound Prior to mounting of the compound to the flow plate, the contour of the compound is tailored so that it fits the flow plate by removing parts of its outer edge. This can for instance be done by cutting out, punching out or using laser. Forming of the contour can be realized e.g. directly on the vacuum gripper, or the compound is put down directly on the flow plate and connected to the latter. In the latter case, the desired contour of the compound is cut directly on the plate.
- the sealing connection towards the flow plate can either be realized using a gasket or using a gluing, or the compound is directly molten or welded to the flow plate.
- the sealing areas on both sides of a water transfer compound are not aligned. They rather show an alternating arrangement with a sequence flow plate—interface 1 —water transfer compound—interface 1 —flow plate—interface 2 —water transfer compound—interface 2 —flow plate . . . where the sealing areas at interface 1 are shifted relative to the sealing areas at interface 2 when both interfaces are projected into a common plane.
- the contour of the membrane is generally different whether it is applied at two interfaces 1 or at two interfaces 2 .
- 1b FIGS. 2a and Details of a humidifier module consisting in two flow 2b: plates and a water transfer compound according to the invention being arranged between the two flow plates
- FIG. 4 A humidifier module in exploded view
- FIG. 5a to Optional details of a production device according to 5d the invention
- FIGS. 6a and Exemplary views of embodiments of water transfer com- 6b pounds according to the invention
- FIG. 10 An exemplary alternative procedure for the production of a humidifier.
- FIG. 1 a shows a humidifier 1 which comprises a plurality of layered humidifier modules 8 , which are stacked and compressed between two end plates 9 . Gases are fed and discharged through the end plates.
- the humidifier 1 is thus a humidifier for the humidification of process gas for fuel cells, comprising a first inlet for feeding dry gases (arrow B) as well as a first outlet for discharging humidifier gases (arrow C) and a first inlet for feeding humid gases (arrow A) as well as a second outlet for discharging dehumidified gases (arrow D).
- FIG. 1 shows a humidifier 1 which comprises a plurality of layered humidifier modules 8 , which are stacked and compressed between two end plates 9 . Gases are fed and discharged through the end plates.
- the humidifier 1 is thus a humidifier for the humidification of process gas for fuel cells, comprising a first inlet for feeding dry gases (arrow B) as well as a first outlet for discharging humidifier gases (arrow C) and a
- 1 b schematically shows the entire construction, where dry process gas is fed from a compressor K via a feeding line B to the humidifier H and as a humidified gas via the outlet C fed to the fuel cell stack S.
- the humid gas which is released from the fuel cell stack S is fed to the humidifier H via a feeding line A, there it releases an essential part of its humidity to the dry gas fed via feeding line B from the compressor K.
- the dehumidified gas leaves the humidifier H via the outlet D.
- FIG. 2 a shows a humidifier module 8 .
- Several of these humidifier modules 8 in layered form are stacked in the humidifier shown in FIG. 1 .
- the humidifier module 8 again shows several layers; in the following, this is further explained using the exploded view in FIG. 2 b .
- the second flow plate 2 . 2 can be identified.
- FIG. 2 b shows the humidifier module 8 given in FIG. 2 a in an exploded view.
- a water transfer compound 4 is shown which is arranged between a first flow plate 2 . 1 and a second flow plate 2 . 2 .
- a porous area of a thermoplastic protection layer is indicated with a crosshatching; the surrounding area is not porous, so that there no gas passage is possible. Details of this arrangement will be explained in detail in the context of FIG. 3 a and the figures following this figure. With respect to FIG.
- the first as well as the second flow plates each show channel structures 3 for the guidance of gases pointing towards the water transfer compound 4 , where these channel structures are each connected via the openings 7 to one of the inlets A, B and one of the outlets C, D, respectively, which have been explained in the context of FIG. 1 .
- This way, humid gas is guided towards the water transfer compound 4 or led away from the water transfer compound, respectively.
- the openings 7 in the flow plates and the water transfer compound 4 are noteworthy, too; they are in certain areas aligned in the stack direction so that a transport of media transversely to the plane of the flow plates or the water transfer compound 4 can be realized.
- Both the shape and the amount of openings in FIG. 2 b are only exemplary; other shapes are feasible, too and they are also not limited to the shapes shown in FIG. 3 a and the consecutive figures.
- FIG. 3 a shows a top view to a water transfer compound.
- FIG. 3 b shows a corresponding top view, however, the water transfer compound 4 shown there additionally comprises positioning holes 12 , which help in the positioning during the stacking of the water transfer compound 4 and the flow plates, 2 . 1 and/or 2 . 2 , respectively. Therefore, in this configuration, all openings are aligned and a wrinkling or bending of the compound is prevented from to the largest extent resulting in the best possible gas tightness is achieved in the stack that is built up.
- FIGS. 3 c to 3 f then show cross sections of the water transfer compound 4 .
- FIGS. 3 c and 3 d show a detailed construction which mainly illustrates the compression state in the transition area of the thicknesses.
- the compression conditions have been chosen differently.
- FIGS. 3 a to 3 f thus show a water transfer compound 4 , preferably for the use in the humidification of process gases for fuel cells, comprising a water-permeable and essentially gas-tight water transfer layer 5 as well as at least one thermoplastic protection layer 6 which is water and gas permeable at least in sections.
- the water transfer layer 5 and the thermoplastic protection layer 6 overlap with each other at least in sections and comprise a first overlapping area 10 and a second overlapping area 11 .
- the water transfer layer 5 in the first overlapping area 10 is accessible for humid gases through the thermoplastic protection layer 6 and the water transfer compound is thermocompressed in the second overlapping area 11 , so that the water transfer layer 5 in the second overlapping area 11 is not accessible for humid gases through the compressed thermoplastic protection layer 6 .
- thermoplastic protection layers 6 are applied to both sides of the water transfer layer 5 . Embodiments with a different number of layers are possible, too.
- the second overlapping area 11 shows a reduced thickness compared to the first overlapping area 10 .
- the largest thickness in the first overlapping area 10 is 200 ⁇ m, as is emphasized by double arrow d 1 in FIG. 3 c .
- the smallest thickness in the second overlapping area 11 indicated with double arrow d 2 , amounts to 80 ⁇ m. It is to be remarked that in particular in the transition area, as can be seen in FIG. 3 c and especially in the detailed drawing in FIG.
- thermoplastic protection layer 6 is porous in the first overlapping area 10 , as is indicated for instance in FIGS. 3 c to 3 f in order to let humid gas. In the second overlapping area 11 , this layer is essentially non-porous so that there no humid air can pass.
- the porosity in the first overlapping area 10 amounts to about 80%.
- FIGS. 3 e and 3 f show other ratios of magnitude.
- the largest thickness dr in the first overlapping area 10 is about 250 ⁇ m.
- the smallest thickness d 2 ′ in the second overlapping area 11 amounts to 50 ⁇ m.
- the porosity in the first overlapping area 10 is higher than 90%.
- the water transfer compounds shown in FIGS. 3 a and 3 b have a second overlapping area, which circumferentially surrounds the first overlapping area.
- the second overlapping area delimits the first overlapping area only at two longitudinal edges of the first overlapping area, as is shown in FIG. 6 a . This is particularly advantageous for water transfer compounds in continuous form.
- FIGS. 3 a to 3 f further show that openings or passages 7 in the second overlapping area are cut out, punched out or laser-cut. These can be openings or passages with a surrounding edge, as is shown in FIGS. 3 a and 3 b . It is however also possible that the outer contour of the compound is cut out, punched out and/or laser-cut from the second overlapping area at least in sections.
- the water transfer layer is realized as an ionomer membrane
- the porous thermoplastic protection layer is made from polypropylene.
- FIG. 4 shows an exploded view of a humidifier module 8 in a lateral perspective.
- the flow plates 2 . 1 , 2 . 2 are each only shown with their surface pointing towards the water transfer compound 4 and thus to the channel structures 3 extending in this surface.
- the opposite surfaces which are shown with a smooth surface can comprise a diversity of possible structures, e.g. with an essentially mirror-symmetric structure to the surface shown. However, for clarity reasons, no explicit illustration of this surface structure is given.
- the water transfer compound 4 is adhesively bonded to the first and/or second flow plate at least in sections.
- the analogous situation can be found with flow plates 2 . 1 and 2 . 2 .
- the adhesive connection is situated in the outer edge area of the first flow plate 2 . 1 and of the second flow plate 2 . 2 .
- an additional material 30 is indicated in the contact area between the first flow plate 2 . 1 and the second overlapping area as well as between a second flow plate 2 . 2 and the second overlapping area.
- This material is for instance an adhesive or a meltable material which can then form an adhesive connection to the second overlapping area 11 .
- the humidifier module 8 shown in FIG. 4 in addition has first and second flow plates 2 . 1 and 2 . 2 with passage openings 7 for the guidance of media in the stack direction, where these openings overlap at least in sections with the openings of the second overlapping area of the water transfer compound 4 , as can be seen in FIG. 4 . From these passage openings 7 , media are fed via the passages 27 extending in parallel to the plane of the plate to the respective channel structures 3 .
- the flow plates 2 . 1 and 2 . 2 are made from plastics, to be more precise from fiber-reinforced polyamide. It is however also possible to use corrosion-stable metallic materials.
- first overlapping area of the water transfer compound 4 overlaps with the channel structures 3 of the first and the second flow plate at least in sections.
- the first and the second flow plates here have different designs; they are different from each other with respect to the arrangement of the feeding lines 27 towards the channel structures.
- Such feeding lines 27 are also given in the plate 2 . 2 but not in the section shown.
- these flow plates can also differ with respect to the choice of material, the form of the channels, the direction of the channels and/or the sealing contour.
- the humidifier modules 8 shown in FIG. 2 a are arranged in a stacked form, as mentioned earlier, in the context of FIG. 1 a . It is possible that the flow plate 2 . 1 has a geometry A and that the flow plate 2 . 2 has a geometry B, that the sequence of these flow plates is A-B-A-B and that the flow plates 2 . 1 and 2 . 2 also have channel structures on their respective opposite surfaces and that each single water transfer compound 4 is arranged between the flow plates on the surfaces provided with channel structures 3 .
- FIG. 5 a shows an arrangement 13 for a continuous supply of a water transfer layer, here from the middle coil 15 and of at least one porous thermoplastic layer 6 , here from the upper and the lower coil in FIG. 5 a as well as an arrangement 14 for an at least partial thermocompression of the water transfer layer and the at least one thermoplastic protection layer.
- the thermocompression is realized in such a way that the compressed areas become water and gas tight.
- the thermocompression is performed along two lands of a hot compression stamp, so that for instance the embodiment of a water transfer compound 4 in continuous form shown in FIG. 6 a results.
- the thermocompression is followed by a cutting arrangement 16 . With this arrangement, a separation of the compound into blanks 19 is possible; the cutting line for instance extends, as is shown in FIG. 6 a , along the center lines, which divide the second overlapping areas horizontally.
- FIG. 5 b schematically shows a laser arrangement with a deflection mirror.
- a cutting of the water transfer compound 4 is possible, for instance a reshaping of the edge or the realization of passage openings.
- FIG. 5 c shows a corresponding variant of FIG. 5 a , here a laser tool is used as the arrangement for laser-cutting 16 instead of the punching/cutting arrangement in FIG. 5 a.
- FIG. 5 d shows a further arrangement, which resembles the one of FIG. 5 a .
- the arrangement for thermocompression 14 and the arrangement 16 are realized in a single working station, both arrangements can however be controlled independent of each other.
- FIGS. 6 a and 6 b again show examples of water transfer compounds 4 .
- the first overlapping area 10 is not completely encircled by the second overlapping area 11
- the first overlapping area 10 is completely surrounded by the second overlapping area 11 .
- FIG. 7 again shows two variants of a complete production process, with arrangements 13 , 14 and 16 according to FIG. 5 d.
- FIG. 7 a an arrangement for the stacking of humidifier modules or of flow plates 2 . 1 and 2 . 2 is shown which immediately follows the arrangements illustrated beforehand.
- This additional arrangement for stacking among others comprises a lifting table, which is indicated with a double arrow from bottom to top.
- an arrangement for laser cutting or laser melting is given.
- the supply of the flow plates 2 . 1 and 2 . 2 is realized by a robot which is not shown here; the feeding is realized below the water transfer compound in continuous form which is maintained under tension.
- a coil with left-overs of the water transfer compound after cutting out of the blanks is shown. These left-overs have continuous form, too.
- the blanks for the humidifier stack are cut from the continuous material of the water transfer compound in such a way that the second overlapping area 11 completely surrounds the first overlapping area 10 . Therefore, the continuous material of the water transfer compound is not completely divided into segments. As a consequence, a mechanical tension can be established between the three coils shown on the left-hand side and the coil on the right-hand side. Therefore, the facial material can be tensioned smooth in order to achieve an optimal facial orientation relative to the subjacent flow plates with which they are connected completely plane.
- FIG. 7 b varies the arrangement for the production process in such a way that the separated blanks 19 of the water transfer compound 4 are first taken up with a vacuum gripper 22 , in order to be connected to the flow plates in a spatially divided working station 28 to form humidifier modules.
- FIGS. 8 a and 8 b show alternative designs of the edges of water transfer compounds 4 according to the invention. It becomes obvious that the outer edges of the water transfer layer 5 and of the thermoplastic protection layer 6 do not have to be flush as in the examples of FIGS. 3 and 4 , but that it is both possible that the water transfer layer 5 extends beyond the outer edge of the thermoplastic protection layer 6 or that the outer edge of the water transfer layer 5 does not reach as far as the outer edge of the thermoplastic protection layer 6 . While the first option provides enhanced sealing properties, the latter option allows for reduction in material use of the typically more expensive water transfer layer 5 .
- FIGS. 9 a to 9 d another design of the outer edge of a water transfer compound 4 according to the invention is explained.
- FIGS. 9 a , 9 b and 9 c show intermediate production steps.
- the outer edge of a first thermoplastic protection layer 6 is folded around the outer edge of the water transfer layer 5 in order to form a kind of hem.
- the three-layered outer edge area is thermocompressed to form a stable and leak tight outer edge which facilitates the next step.
- the outer edge of a second thermoplastic protection layer 6 is folded around the outer edge of the already thermocompressed outer edge formed from the first thermoplastic protection layer 6 and the water transfer layer 5 , see FIG. 9 c .
- this second three-layered outer edge area is again thermocompressed in order to provide for an outer edge region with excellent stability and further improved leak tightness.
- these four steps can be realized on all four outer edges of the water transfer compound 4 . It is however preferred that it is realized on two edges only which extend in the feeding direction of the layers. In this respect, it is most preferred that the thermocompression is realized in a continuous process using heated rolls.
- FIG. 10 illustrates an exemplary alternative procedure and production arrangement for the production of a humidifier.
- the arrangement 13 for the continuous supply of the water transfer layer 5 e from the middle coil 15 and of the porous thermoplastic layers 6 is realized as in the example of FIG. 5 a .
- the thermocompression is achieved here in two steps.
- the lateral outer edges of the water transfer compound are thermocompressed using heated rolls 34 , 34 ′ at both lateral edges in working station 24 .
- the layers are fed using guiding rolls 23 .
- thermocompression of the water transfer layer and the thermoplastic protection layers in a transverse direction is realized in an arrangement 14 .
- the subsequent working stations 16 , 18 correspond to the ones given in the example of FIG. 7 a.
Landscapes
- 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)
- Laminated Bodies (AREA)
- Fuel Cell (AREA)
Abstract
The application relates to a water transfer compound, preferably for use for the humidification of process gases for fuel cells, comprising:—a water-permeable and essentially gas-impermeable water transfer layer as well as—at least one thermoplastic protection layer which is water- and gas-permeable at least in sections, where—the water transfer layer and the thermoplastic protection layer overlap each other at least in sections and comprise a first and a second overlapping area, where—the water transfer layer in the first overlapping area is accessible for humid gases through the thermoplastic protection layer and the water transfer compound is thermocompressed in the second overlapping area so that the water transfer layer in the second overlapping area is not accessible for humid gases through the compressed thermoplastic protection layer.
Description
- The present invention relates to a water transfer compound, a humidifier module, a humidifier as well as a device for the production of a water transfer compound. The water transfer compound can preferably be used for the humidification of process gases for fuel cells.
- Fuel cells among others use gaseous process media, such as molecular hydrogen and oxygen for producing electrical current.
- Such fuel cells usually use polymer-electrolyte membranes (PEM). During operation, such a PEM heats up to 80 or 90° C. It is important for the degree of efficiency of a fuel cell as well as for the durability of the PEM that relatively stationary conditions are given in the area of the PEM both with respect to temperature and humidity. In particular, drying-out of the PEM can have a negative impact on the durability and the degree of efficiency of the fuel cell.
- For a purposeful setting of the degree of humidity of the process gases fed to the fuel cell, it is therefore usual to humidify particular process gases before they are fed to the fuel cell. To this end, humidifiers are known in which a water-permeable membrane is arranged between two flow plates comprising flow channels. This water-permeable membrane or water transfer layer separates a dry gas stream which is to be humidified on its one side and a gas stream which needs to be dehumidified on its other side.
- As the water-permeable membrane, at least with a minimum humidification is essentially gas-tight, an approximation of the water content in both gases is achieved but a mixture of the gases themselves is prevented. It is however disadvantageous that known humidifiers are very expensive in their production and that tolerances for production and mounting have to be followed very closely in order to guarantee the desired humidity exchange.
- Both components used to this end as they are used in the state of the art, in particular the water-permeable membrane, thus the water-transferring layer, are extremely thin and therefore limp, which causes a particular difficulty. If thermoplastic protective layers are used for the protection of these fragile membranes, their porosity impedes a grasping and positioning using the vacuum gripping systems usually used in automatized processes. Due to this, positioning procedures become very complex and even with the slightest imprecision leakages can occur, e.g. caused by folded or wrongly inserted membranes.
- It is therefore the purpose of the present invention to provide for a water transfer compound, a humidifier module, a humidifier and a device as well as a method for the production of these, respectively, where the corresponding products can be produced on a large scale and which are cost-efficient given their clever design, so that the humidifiers and the fuel cell systems connected to them, respectively, can be operated flawlessly.
- This purpose is achieved by the objects of the independent claims.
- To begin with, this is a water-transfer compound, in particular for the use for the humidification of process gases for fuel cells, comprising:
-
- a water-permeable and essentially gas-tight water transfer layer as well as
- at least one thermoplastic protection layer, where
- the water transfer layer and the thermoplastic protection layer overlap with each other at least in sections and comprise a first and a second overlapping area,
- with the water-transfer compound being water-permeable in the first overlapping area and thermocompressed and therefore water and gas tight in the second overlapping area.
- Prior to joining, the water transfer layer as well as the thermoplastic protection layer or layers, respectively, are arranged so that they overlap at least partially. This does however not mean that these need to have congruent outer edges. Here, it is only required that an overlap is present at all.
- This overlap according to the invention has two areas, a first and a second overlapping area.
- In this respect, it is important that in the first overlapping area, a passage of humidity or humid gases through the thermoplastic protection layer is possible. This means that the thermoplastic protection layer as it is given in the water transfer compound at least in sections needs to be water and gas permeable in order to allow a realization of the invention.
- In the second overlapping area, which is thermocompressed, the thermoplastic protection layer is compressed in such a way that it is non-permeable for gases, especially humid gases, and therefore the water transfer layer situated subjacent the thermoplastic protection layer is not accessible for humid gases. This means that in the second overlapping area, the thermoplastic protection layer compressed as described is impermeable for water and gases, preferably both in the direction of its plane as well as transversely to the direction of its plane. In general, the subjacent water transfer layer on its entire face is at least not permeable for gases, but permeable for liquids. This is especially true transversely to the face.
- During thermocompression, a hot roll or stamp is applied to the areas to be connected using pressure. For the water transfer compound according to the invention, typical pressures used are 0.1 to 5 MPa, preferably 0.8 to 2 MPa with typical temperatures of 150° to 300° C., preferably 220 to 270° C. The exact conditions to be used will also depend on the particular material used.
- Advantageous variants of the invention are described in the other claims.
- An advantageous variant provides that thermoplastic protection layers are provided on both sides of the water transfer layer. This allows an exceptional protection of the water transfer layer as the latter with this means is protected on both sides. It shall however be emphasized that this three-layered arrangement is not compulsive for the invention; two-layered arrangements as well as arrangements with further layers or additional intermediate layers, respectively, are also covered by the invention.
- An advantageous variant provides that the second overlapping area shows a reduced thickness compared to the first overlapping area.
- The smallest thickness is here accepted to be the thickness of the second overlapping area as one can assume that this area is impermeable for humid gas. The thickness of the first overlapping area is adopted as the largest thickness of the first overlapping area. For technical reasons, various variants of the layer thickness will be given in a transition area in which the thickness increases steadily from the second overlapping area to the first overlapping area. In this transition area, humid gas can still permeate at least to some extent. However, this transition area in the present description is considered to be part of the first overlapping area.
- A further embodiment provides that the second overlapping area delimits the first overlapping area at least at two longitudinal edges of the first overlapping area. This is particularly advantageous if an assembly of coil-material is realized in order to obtain a continuous water transfer compound. In this case a separation of individual segments can then be realized, e.g. transversely to the longitudinal edges of the coil.
- It is however also possible that the second overlapping area delimits the first overlapping area circumferentially. This way, a lateral sealing of the so-called active area of the water-transfer compound can also be achieved in an easier way.
- An advantageous variant provides that the thickness in the first overlapping area amounts to between 35 and 600 μm and that the thickness in the second overlapping area corresponds to 10 to 75%, preferably to 20 to 50% of the thickness of the first overlapping area. The thickness strongly depends on whether only one or two thermoplastic protective layers are present. The thickness of an individual thermoplastic protective layer in the first overlapping area in general corresponds to between 30 and 250 μm, preferably between 80 and 110 μm. The thickness of the water transfer layer in the first overlapping area generally corresponds to between 8 and 30 μm, preferably between 15 and 30 μm.
- An advantageous variant provides that the thermoplastic protection layer in the first overlapping area is porous and has a porosity of preferably 50 to 95%.
- The porosity here allows for a diffusion of humid gases through the thermoplastic protection layer to the water transfer layer. The porosity is here considered in the area of the thermoplastic protection layer which has neither been thermally nor mechanically influenced by thermocompression; thus, not in the transition area towards the second overlapping area. A further advantageous embodiment provides that the thermoplastic protection layer in the second overlapping area is essentially non-porous, thus the density of the thermoplastic protection layer in this area is higher than in the above-mentioned porous area of the first overlapping area.
- An embodiment provides that in the second overlapping area, openings are cut out, punched out or introduced by laser. This relates to so-called inner areas which are entirely surrounded by the second overlapping area. It is however also possible—either alternatively or additionally—that the outer edges of the water transfer compound at least in sections in or at the second overlapping area are cut out, punched out or reshaped by laser.
- In a preferred embodiment, the water-transfer layer is realized as a non-reinforced membrane, which can rest on a support medium. Analogously to the protection layer, thermoplastic fiber papers, fiber rovings, fleece or fiber weave with polymeric fibers can be used. In an alternative advantageous embodiment, the water transfer layer is realized as a reinforced membrane.
- An embodiment provides that the thermoplastic protective layer comprises polyester, polypropylene, polyethylene, polyvinylidene fluoride, polytetrafluorethylene, polyphtalamide, polyethylene terephthalate and/or polybutylene terephthalate or consists of such. This means that the materials mentioned can be used in the pure form. However, thermoplastic protective layers can also be made from a layering of these materials or comprise a mixture of these materials.
- An embodiment provides that the water transfer layer is realized as a porous medium, as a coated and/or impregnated weave (Texapore®, Venturi®), as a membrane laminate (Goretex®), as a membrane impregnated with ionomers, as a polymer electrolyte membrane (Nafion®), as a hydrophilic membrane or as a diaphragm. These materials are commercially available, but generally very easily damaged. Therefore, the invention is useful for the protection of these water transfer layers. The impregnations mentioned in this context are impregnations which amend the properties of the water transfer layer. The impregnations are applied to the full area of the water transfer layer. They do not relate to any kind of impregnation locally applied to the outer edges of a ready-made water transfer compound; such impregnations are used in the state of the art in order to improve leak tightness of compounds towards the outside.
- The invention further relates to a humidifier module, in particular for the humidification of process gases of fuel cells, which comprise at least a first as well as a second flow plate as well as a water transfer compound as described above arranged between the first and second flow plate, where the first and second flow plate each comprise channel structures for the guidance of gases.
- An advantageous variant to this provides that the water transfer compound in its second overlapping area at least in sections is adhesively bonded to a first and/or second flow plate. This way, sealing of the humidifier module can be ascertained. Moreover, this arrangement is even less sensitive against mechanical stress and bending, respectively, compared to the unprotected water transfer compound mentioned beforehand. In this context, it is advantageous that the adhesive connection is arranged at least in sections in the outer edge area of the water transfer compound and/or of the first and/or second flow plate. Gluing, melting, welding and in particular ultra-sonic welding lend themselves for this connection between flow plates and the water transfer compound.
- An alternative embodiment provides that the first and/or second flow plate comprise a sealing area which surrounds the channel structures. Here, the water transfer compound is connected in a force fit manner to the first and/or second flow plate by placing it on the sealing area.
- In another alternative preferred embodiment, the first and the second flow plate again show a sealing area surrounding the channel structures. Here, structures are incorporated in both flow plates which are at least in part complementary to each other, e.g. comparable to a tongue and groove connection. The flow plates can be connected to each other using these complementary structures. Leak tightness can be achieved by clamping the water transfer compound between the complementary structures. It is preferred that the compressed, second overlapping area is clamped between these structures. The connection is realized as a positive fit and force fit. In order to obtain an optimal sealing, the complementary structures are designed such that the shapes do only optimally fit once the water transfer compound has been received.
- It is advantageous that the first and/or second flow plate of a humidifier module comprise openings for the guidance of media in the direction of the stack, which openings overlap at least in sections with the openings in the second overlapping area of the water transfer compound. With this, a secure and tight guidance of media, in particular of gases, is achieved in the direction of the stack.
- As an alternative, it can also be advantageous if the first and/or second flow plate comprise openings for the guidance of media in the stack direction but that all these openings for media guidance are arranged outside that section of the respective flow plate which is covered by the water transfer compound. In this alternative embodiment, the outer contour of the water transfer compound is smaller than in the preceding embodiment, thus it allows saving material.
- An advantageous variant provides that the flow plates at least in sections are produced from thermoplastic, elastomeric or thermoset plastics and/or consist at least in sections in corrosion-stable metallic material.
- An embodiment provides that the first overlapping area of the water transfer compound at least in sections overlaps with the channel structures of the first and second flow plate. With this, it is ascertained that the humidity passing through the water transfer layer is guided to the desired channels and that in their further pathway they reach the corresponding outlets of the humidifier module.
- An embodiment provides that the first and second flow plate are different from each other in at least one of choice of material, form of channels, direction of channels and sealing contour. This can be advantageous as the guidance of media can be easily realized through a predetermined course of different flow plates. It shall however explicitly not be excluded for the structures of the flow plates to be identical.
- However, a variant can be advantageous in which flow plates with geometry A and flow plates with geometry B are given and in which the layering of flow plates has the sequence A-B-A-B etc. With a layering sequence A-B-A-B it is advantageous if on both sides of plate A, humid gas flows into the channel structure in order to be humidified and that on both sides of plate B, humid gas enters into the flow channels. Then, it is preferable that one water transfer compound is arranged between all flow plates.
- The invention also relates to a humidifier, in particular for the humidification of process gas for fuel cells, comprising:
-
- a first inlet for feeding dry gases as well as a first outlet for releasing humidified gases, and
- a second inlet for feeding humid gases as well as a second outlet for releasing dehumidified gases,
- at least one humidifier module as described above, where
- the channel structures of the humidifier module are connected to at least one of the above-mentioned inlets or outlets, respectively.
- Such a humidifier is advantageously connectible to a fuel cell system. This way, a humidifier can be provided which is producible cost-efficiently and at large scale, which humidifier provides fuel cell systems with process gases humidified to the degree required.
- The invention in addition relates to a device for the production of a water transfer compound, of a humidifier module and/or of a humidifier, comprising:
-
- an arrangement for a continuous or discontinuous supply of a water transfer layer and at least one porous thermoplastic protection layer, as well as
- an arrangement for an at least sectional thermocompression of the water transfer layer and of the at least one thermoplastic protection layer, with the thermocompression being realized in such a manner that the compressed areas are water and gas tight.
- According to the invention, the arrangement may thus work continuously or discontinuously, it is only important that a thermocompression of at least two layers is realized in order to obtain the first and second overlapping areas mentioned beforehand with their properties according to the invention.
- An embodiment provides that the arrangement for the continuous or discontinuous supply is designed in such a way that the water transport layer is fed between the two porous thermoplastic protection layers. This is the preferred variant; nevertheless, variations with a different number of layers, as already mentioned above, are possible, too.
- An embodiment provides that the continuous supply is realized using coils. The water transfer layer and the thermoplastic protection layers, respectively, are available at a large industrial scale as a coil material. This way, it is easy to produce a water transfer compound in continuous form. As an alternative, blanks of the individual materials can be employed to be overlapped before the thermocompression in order to form the assembly. One embodiment of this alternative approach is realized in such a way that the respective blanks are covered with a peel-off film and stored before they are overlapped with each other.
- It is to be emphasized that the thermocompression is only realized in areas, preferably in discrete areas, but that no full-face lamination takes place. The thermocompression of the discrete areas can for instance be realized using a frame-shaped stamp. As an alternative, thermocompression in the longitudinal direction and in the transverse direction—relative to the feeding direction of the coil-material—can be realized separately. To this end, it is preferred that the thermocompression in the longitudinal direction is realized as a continuous process using heated rolls, while the thermocompression in the transverse direction is realized as a discrete process using a single or several heated stamps. If several stamps, e.g. two stamps, are used, it is preferred that they are oriented essentially parallel to each other.
- Thermocompression adjacent to the longitudinal edge of the material can be realized with the different layers being fed one upon the other with flat, open outer edges, where the edge of the water transfer layer may be flush with the edge of the porous thermoplastic protection layer(s) or extend beyond this edge or be distanced to this edge. Instead of leaving the outer edges of the layers flat and open, it is also possible that they form a kind of hem with at least one layer being folded around another one. It is preferred that this later embodiment is combined with the continuous process using thermocompression rolls. With a three-layer compound, an advantageous variant provides that both lateral outer edges of a first one of the porous thermoplastic protection layers are folded around the lateral outer edges of the water transfer layer and that in a consecutive step, the lateral outer edges of the second one of the porous thermoplastic protection layers are folded around the hem produced this way. On the one hand, it is possible that an intermediate thermocompression is realized with only two layers folded this way and that a second thermocompression step is realized once both foldings have been completed. This provides the advantage that the intermediate hem is flattened before the third layer is folded around. On the other hand, a single thermocompression step can be realized once the hemming has been completed.
- An embodiment provides that the device additionally comprises a cutting arrangement for the cutting of the thermocompressed water transfer compound, in particular for the cutting of its edges as well as for the production of openings. This is advantageously realized using laser or by cutting or punching dies.
- In this context it is possible but not required that the thermocompression and the cutting of the openings and/or the cutting of the edges is realized in a single working station. In particular with a combined tooling setup, the thermocompression with a simultaneous cutting using a punching die or cutting knives can have advantages as the sequence of the process is optimized.
- An embodiment provides that the assembly device additionally comprises a stacking arrangement, which is designed for the stacking of the water transfer compound and of the flow plates in a predetermined order. The water transfer compound and the flow plates may have the same size or a different one. This way, the corresponding stacks may “grow”. The supply of the flow plates may for instance be realized laterally using suited robot arms. Doing so, the supply of the water transfer compound is considerably facilitated compared to a supply of the individual layers. In addition to a reduction of the amount of parts to be handled, the gripping and positioning is facilitated as the gas tightness of the water transfer layer enables the water transfer compound to be caught by a vacuum gripper without a negative impact resulting from the porosity of the thermoplastic protection layer.
- A particular design of this assembly device comprises at least the following arrangements:
- a) an arrangement comprising a coil feed for a continuous supply for the water transfer layer as well as for the overlying and the subjacent porous thermoplastic protection layers as starting products for forming a water transfer compound in continuous form,
-
- b) an arrangement for thermocompression of the water transfer compound having continuous form,
- c) an arrangement for the production of openings in the water transfer compound having continuous form,
- d) an arrangement for stacking of flow plates below the water transfer compound having continuous form as well as for separating individual sections of the water transfer compound having continuous form for forming humidifier modules and/or stacks of humidifier modules by connection of the separated sections of the water transfer compound with subjacent flow plates.
- In this context, it is advantageous that a continuous process at large industrial scale can be realized. It is particularly advantageous that even the left over material, thus the sections of water transfer compound not used in the stack of humidifier modules, can be continuously rolled up at the end of the assembly device and therefore be disposed of or recycled in a facilitated manner. With respect to this roll to roll arrangement, it is further advantageous that the foil which is prone to be folded or bent can be easily tensioned so that the blanks cut from the water transfer compound having continuous form can be connected to the flow plates while being under tension. This is particularly true for the water transfer layer, but applies to the thermoplastic protection layers, too. Therefore, a bending or wrinkling can be avoided which is particularly advantageous for the leak tightness of the humidifier to be produced.
- Another advantageous design of this assembly device comprises at least the following arrangements:
-
- a) an arrangement comprising a coil feed for a continuous supply for the water transfer layer as well as for the overlying and the subjacent porous thermoplastic protection layers as starting products for forming a water transfer compound in continuous form,
- b) an arrangement for thermocompression of the water transfer compound having continuous form,
- c) an arrangement for cutting the outer contour of the water transfer compound and optionally for the production of openings in the water transfer compound,
- d) an arrangement for the transfer of separated sections for the water transfer compound and
- e) an arrangement which may be spatially separated from the other arrangements for stacking of flow plates below and/or above the separated sections of the water transfer compound for forming humidifier modules or stacks humidifier modules respectively, by connecting separated sections of the water transfer compound with overlying and/or subjacent flow plates.
- Here, it is possible, too, to wind up the left over material after the cutting of the outer edges and to maintain the different conveying paths of material under tension. Given the gas tightness of the water transfer layer, the separated sections of the water transfer compound can be easily removed from the cutting station using a vacuum gripper and be either directly or indirectly transported to the stacking or connecting station for the humidifier modules. With an indirect transfer, the separated sections of the water transfer compound are advantageously collected in a large number and later on, this collection of ready-made water transfer compounds is fed to a stacking- or connecting station which is advantageously spatially separated from the other stations.
- A possible variant provides that the individual materials diffusion medium, membrane and diffusion medium, which is the same as the thermoplastic protection layer, the water transfer layer and the other thermoplastic protection layer mentioned above, are fed from a coil of the device and are positioned one above the other in parallel. A hot stamp or coining roll acting from one or both sides welds the compound in the edge region facially and gas tight. Doing so, the thermoplastic diffusion medium is melted and compressed and in this way, the porosity of these layers is eliminated in the regions treated, thus in the welded areas. In the end, a flat, mainly smooth edge structure results which fixes the membrane located in the center of the compound. Moreover, the edge structure becomes adhesively bonded to the membrane and therefore protects the fragile membrane from mechanical stress. In addition, an ideal area for the sealing of the membrane or for the application of a gluing to the flow plate is formed. Prior to mounting of the compound to the flow plate, the contour of the compound is tailored so that it fits the flow plate by removing parts of its outer edge. This can for instance be done by cutting out, punching out or using laser. Forming of the contour can be realized e.g. directly on the vacuum gripper, or the compound is put down directly on the flow plate and connected to the latter. In the latter case, the desired contour of the compound is cut directly on the plate. The sealing connection towards the flow plate can either be realized using a gasket or using a gluing, or the compound is directly molten or welded to the flow plate. As the water transfer compound is already gas tight in its edge region, the positioning of the transfer compound relative to the flow plate is considerably facilitated and, therefore, misalignments or leakages can be better excluded. Mounting of alternatingly repeating layers is facilitated and becomes faster and more cost-efficient.
- In many humidifier stacks, the sealing areas on both sides of a water transfer compound are not aligned. They rather show an alternating arrangement with a sequence flow plate—interface 1—water transfer compound—interface 1—flow plate—interface 2—water transfer compound—interface 2—flow plate . . . where the sealing areas at
interface 1 are shifted relative to the sealing areas atinterface 2 when both interfaces are projected into a common plane. In this situation, the contour of the membrane is generally different whether it is applied at twointerfaces 1 or at twointerfaces 2. With such a configuration it is advantageous to realize the thermocompression with a larger width than would be required for the smaller one of both contours and to subsequently cut out the required contour within the thermocompressed area. As already mentioned, this can be realized with high speed, precision and flexibility using laser cutting. - The invention is now explained using several figures. It is to be noted that identical reference numbers in different figures denote similar elements even if these are not explicitly mentioned when discussing a figure. For additional information, the reader is referred to the list of reference numbers at the end of the specification. There are shown in
-
FIGS. 1a and A humidifier according to the invention; 1b: FIGS. 2a and Details of a humidifier module consisting in two flow 2b: plates and a water transfer compound according to the invention being arranged between the two flow plates; FIGS. 3a to Details of embodiments of water transfer compounds 3f: according to the invention; FIG. 4: A humidifier module in exploded view; FIG. 5a to Optional details of a production device according to 5d: the invention; FIGS. 6a and Exemplary views of embodiments of water transfer com- 6b: pounds according to the invention; FIGS. 7a and Two exemplary procedures for the production of a 7b: humidifier; FIGS. 8a and Alternative designs of the edges of water transfer com- 8b pounds according to the invention; FIGS. 9a to A further alternative design of the outer edge of a water 9d transfer compound according to the invention in three in- termediate state and in the final state of the production process; and FIG. 10 An exemplary alternative procedure for the production of a humidifier. -
FIG. 1 a shows ahumidifier 1 which comprises a plurality oflayered humidifier modules 8, which are stacked and compressed between twoend plates 9. Gases are fed and discharged through the end plates. Thehumidifier 1 is thus a humidifier for the humidification of process gas for fuel cells, comprising a first inlet for feeding dry gases (arrow B) as well as a first outlet for discharging humidifier gases (arrow C) and a first inlet for feeding humid gases (arrow A) as well as a second outlet for discharging dehumidified gases (arrow D).FIG. 1 b schematically shows the entire construction, where dry process gas is fed from a compressor K via a feeding line B to the humidifier H and as a humidified gas via the outlet C fed to the fuel cell stack S. The humid gas which is released from the fuel cell stack S is fed to the humidifier H via a feeding line A, there it releases an essential part of its humidity to the dry gas fed via feeding line B from the compressor K. The dehumidified gas leaves the humidifier H via the outlet D. -
FIG. 2 a shows ahumidifier module 8. Several of thesehumidifier modules 8 in layered form are stacked in the humidifier shown inFIG. 1 . - The
humidifier module 8 again shows several layers; in the following, this is further explained using the exploded view inFIG. 2 b. In contrast, on the front side ofFIG. 2 a only the second flow plate 2.2 can be identified. -
FIG. 2 b shows thehumidifier module 8 given inFIG. 2 a in an exploded view. - At the center, a
water transfer compound 4 is shown which is arranged between a first flow plate 2.1 and a second flow plate 2.2. On thewater transfer compound 4, a porous area of a thermoplastic protection layer is indicated with a crosshatching; the surrounding area is not porous, so that there no gas passage is possible. Details of this arrangement will be explained in detail in the context ofFIG. 3 a and the figures following this figure. With respect toFIG. 2 b, it is emphasized that the first as well as the second flow plates eachshow channel structures 3 for the guidance of gases pointing towards thewater transfer compound 4, where these channel structures are each connected via theopenings 7 to one of the inlets A, B and one of the outlets C, D, respectively, which have been explained in the context ofFIG. 1 . This way, humid gas is guided towards thewater transfer compound 4 or led away from the water transfer compound, respectively. Theopenings 7 in the flow plates and thewater transfer compound 4, respectively are noteworthy, too; they are in certain areas aligned in the stack direction so that a transport of media transversely to the plane of the flow plates or thewater transfer compound 4 can be realized. Both the shape and the amount of openings inFIG. 2 b are only exemplary; other shapes are feasible, too and they are also not limited to the shapes shown inFIG. 3 a and the consecutive figures. - In the following, the
water transfer compound 4 according to the invention is explained usingFIGS. 3 a to 3 f.FIG. 3 a shows a top view to a water transfer compound.FIG. 3 b shows a corresponding top view, however, thewater transfer compound 4 shown there additionally comprises positioning holes 12, which help in the positioning during the stacking of thewater transfer compound 4 and the flow plates, 2.1 and/or 2.2, respectively. Therefore, in this configuration, all openings are aligned and a wrinkling or bending of the compound is prevented from to the largest extent resulting in the best possible gas tightness is achieved in the stack that is built up. -
FIGS. 3 c to 3 f then show cross sections of thewater transfer compound 4.FIGS. 3 c and 3 d show a detailed construction which mainly illustrates the compression state in the transition area of the thicknesses. InFIGS. 3 e and 3 f, the compression conditions have been chosen differently. -
FIGS. 3 a to 3 f thus show awater transfer compound 4, preferably for the use in the humidification of process gases for fuel cells, comprising a water-permeable and essentially gas-tightwater transfer layer 5 as well as at least onethermoplastic protection layer 6 which is water and gas permeable at least in sections. Thewater transfer layer 5 and thethermoplastic protection layer 6 overlap with each other at least in sections and comprise a first overlappingarea 10 and a second overlappingarea 11. Thewater transfer layer 5 in the first overlappingarea 10 is accessible for humid gases through thethermoplastic protection layer 6 and the water transfer compound is thermocompressed in the second overlappingarea 11, so that thewater transfer layer 5 in the second overlappingarea 11 is not accessible for humid gases through the compressedthermoplastic protection layer 6. - In
FIGS. 3 c to 3 f it is obvious that thethermoplastic protection layers 6 are applied to both sides of thewater transfer layer 5. Embodiments with a different number of layers are possible, too. InFIGS. 3 c to 3 f, one can identify that the second overlappingarea 11 shows a reduced thickness compared to the first overlappingarea 10. The largest thickness in the first overlappingarea 10 is 200 μm, as is emphasized by double arrow d1 inFIG. 3 c. The smallest thickness in the second overlappingarea 11, indicated with double arrow d2, amounts to 80 μm. It is to be remarked that in particular in the transition area, as can be seen inFIG. 3 c and especially in the detailed drawing inFIG. 3 d, which shows the left section ofFIG. 3 c in detail, the thickness can range between these two values mentioned above. Thethermoplastic protection layer 6 is porous in the first overlappingarea 10, as is indicated for instance inFIGS. 3 c to 3 f in order to let humid gas. In the second overlappingarea 11, this layer is essentially non-porous so that there no humid air can pass. The porosity in the first overlappingarea 10 amounts to about 80%. -
FIGS. 3 e and 3 f show other ratios of magnitude. The largest thickness dr in the first overlappingarea 10 is about 250 μm. The smallest thickness d2′ in the second overlappingarea 11 amounts to 50 μm. The porosity in the first overlappingarea 10 is higher than 90%. - The water transfer compounds shown in
FIGS. 3 a and 3 b have a second overlapping area, which circumferentially surrounds the first overlapping area. As an alternative to this, it is however also possible that no surrounding enclosure is given, e.g. that the second overlapping area delimits the first overlapping area only at two longitudinal edges of the first overlapping area, as is shown inFIG. 6 a. This is particularly advantageous for water transfer compounds in continuous form. - The embodiments according to
FIGS. 3 a to 3 f further show that openings orpassages 7 in the second overlapping area are cut out, punched out or laser-cut. These can be openings or passages with a surrounding edge, as is shown inFIGS. 3 a and 3 b. It is however also possible that the outer contour of the compound is cut out, punched out and/or laser-cut from the second overlapping area at least in sections. - As to the choice of the material of the water transfer layer or of the thermoplastic protective layer, a vast variety of materials is possible. In the present example, the water transfer layer is realized as an ionomer membrane, the porous thermoplastic protection layer is made from polypropylene.
-
FIG. 4 shows an exploded view of ahumidifier module 8 in a lateral perspective. InFIG. 4 , the flow plates 2.1, 2.2 are each only shown with their surface pointing towards thewater transfer compound 4 and thus to thechannel structures 3 extending in this surface. The opposite surfaces which are shown with a smooth surface can comprise a diversity of possible structures, e.g. with an essentially mirror-symmetric structure to the surface shown. However, for clarity reasons, no explicit illustration of this surface structure is given. - In the mounted state, as is for instance shown schematically in
FIG. 2 a, thewater transfer compound 4 is adhesively bonded to the first and/or second flow plate at least in sections. InFIG. 4 , the analogous situation can be found with flow plates 2.1 and 2.2. Here, the adhesive connection is situated in the outer edge area of the first flow plate 2.1 and of the second flow plate 2.2. InFIG. 4 , in the contact area between the first flow plate 2.1 and the second overlapping area as well as between a second flow plate 2.2 and the second overlapping area, anadditional material 30 is indicated. This material is for instance an adhesive or a meltable material which can then form an adhesive connection to the second overlappingarea 11. - It is however also possible that 30 only represents a sealing material and that the sealing effect desired for is achieved by force fit.
- The
humidifier module 8 shown inFIG. 4 in addition has first and second flow plates 2.1 and 2.2 withpassage openings 7 for the guidance of media in the stack direction, where these openings overlap at least in sections with the openings of the second overlapping area of thewater transfer compound 4, as can be seen inFIG. 4 . From thesepassage openings 7, media are fed via thepassages 27 extending in parallel to the plane of the plate to therespective channel structures 3. - The flow plates 2.1 and 2.2 are made from plastics, to be more precise from fiber-reinforced polyamide. It is however also possible to use corrosion-stable metallic materials.
- One can further see that the first overlapping area of the
water transfer compound 4 overlaps with thechannel structures 3 of the first and the second flow plate at least in sections. - The first and the second flow plates here have different designs; they are different from each other with respect to the arrangement of the feeding lines 27 towards the channel structures.
Such feeding lines 27 are also given in the plate 2.2 but not in the section shown. In general, these flow plates can also differ with respect to the choice of material, the form of the channels, the direction of the channels and/or the sealing contour. - The
humidifier modules 8 shown inFIG. 2 a are arranged in a stacked form, as mentioned earlier, in the context ofFIG. 1 a. It is possible that the flow plate 2.1 has a geometry A and that the flow plate 2.2 has a geometry B, that the sequence of these flow plates is A-B-A-B and that the flow plates 2.1 and 2.2 also have channel structures on their respective opposite surfaces and that each singlewater transfer compound 4 is arranged between the flow plates on the surfaces provided withchannel structures 3. - In the following, the production of a water transfer compound, of a humidifier module and of a humidifier, respectively, is discussed. It will be explained in the following. However, it is to be emphasized that with this all details of the production method are disclosed and that herewith not only the device for the production, but also its way of functioning, thus also the method for the production, can be distinctively derived.
-
FIG. 5 a shows anarrangement 13 for a continuous supply of a water transfer layer, here from themiddle coil 15 and of at least oneporous thermoplastic layer 6, here from the upper and the lower coil inFIG. 5 a as well as anarrangement 14 for an at least partial thermocompression of the water transfer layer and the at least one thermoplastic protection layer. The thermocompression is realized in such a way that the compressed areas become water and gas tight. In the embodiment shown inFIG. 5 a, the thermocompression is performed along two lands of a hot compression stamp, so that for instance the embodiment of awater transfer compound 4 in continuous form shown inFIG. 6 a results. InFIG. 5 a, the thermocompression is followed by a cuttingarrangement 16. With this arrangement, a separation of the compound intoblanks 19 is possible; the cutting line for instance extends, as is shown inFIG. 6 a, along the center lines, which divide the second overlapping areas horizontally. -
FIG. 5 b schematically shows a laser arrangement with a deflection mirror. With this arrangement, a cutting of thewater transfer compound 4 is possible, for instance a reshaping of the edge or the realization of passage openings. -
FIG. 5 c shows a corresponding variant ofFIG. 5 a, here a laser tool is used as the arrangement for laser-cutting 16 instead of the punching/cutting arrangement inFIG. 5 a. -
FIG. 5 d shows a further arrangement, which resembles the one ofFIG. 5 a. However, here the arrangement forthermocompression 14 and thearrangement 16 are realized in a single working station, both arrangements can however be controlled independent of each other. -
FIGS. 6 a and 6 b again show examples of water transfer compounds 4. InFIG. 6 a, the first overlappingarea 10 is not completely encircled by the second overlappingarea 11, while inFIG. 6 b the first overlappingarea 10 is completely surrounded by the second overlappingarea 11. - Finally,
FIG. 7 again shows two variants of a complete production process, witharrangements FIG. 5 d. - In addition, in the embodiment of
FIG. 7 a, an arrangement for the stacking of humidifier modules or of flow plates 2.1 and 2.2 is shown which immediately follows the arrangements illustrated beforehand. This additional arrangement for stacking among others comprises a lifting table, which is indicated with a double arrow from bottom to top. Further in the area of thearrangement 18, an arrangement for laser cutting or laser melting is given. The supply of the flow plates 2.1 and 2.2 is realized by a robot which is not shown here; the feeding is realized below the water transfer compound in continuous form which is maintained under tension. On the right hand side inFIG. 7 a, a coil with left-overs of the water transfer compound after cutting out of the blanks is shown. These left-overs have continuous form, too. In thearrangement 18 shown inFIG. 7 , the blanks for the humidifier stack are cut from the continuous material of the water transfer compound in such a way that the second overlappingarea 11 completely surrounds the first overlappingarea 10. Therefore, the continuous material of the water transfer compound is not completely divided into segments. As a consequence, a mechanical tension can be established between the three coils shown on the left-hand side and the coil on the right-hand side. Therefore, the facial material can be tensioned smooth in order to achieve an optimal facial orientation relative to the subjacent flow plates with which they are connected completely plane. -
FIG. 7 b varies the arrangement for the production process in such a way that the separatedblanks 19 of thewater transfer compound 4 are first taken up with avacuum gripper 22, in order to be connected to the flow plates in a spatially divided workingstation 28 to form humidifier modules. -
FIGS. 8 a and 8 b show alternative designs of the edges ofwater transfer compounds 4 according to the invention. It becomes obvious that the outer edges of thewater transfer layer 5 and of thethermoplastic protection layer 6 do not have to be flush as in the examples ofFIGS. 3 and 4 , but that it is both possible that thewater transfer layer 5 extends beyond the outer edge of thethermoplastic protection layer 6 or that the outer edge of thewater transfer layer 5 does not reach as far as the outer edge of thethermoplastic protection layer 6. While the first option provides enhanced sealing properties, the latter option allows for reduction in material use of the typically more expensivewater transfer layer 5. - In
FIGS. 9 a to 9 d, another design of the outer edge of awater transfer compound 4 according to the invention is explained.FIGS. 9 a, 9 b and 9 c show intermediate production steps. In the first step, the outer edge of a firstthermoplastic protection layer 6 is folded around the outer edge of thewater transfer layer 5 in order to form a kind of hem. In the next step, shown inFIG. 9 b, the three-layered outer edge area is thermocompressed to form a stable and leak tight outer edge which facilitates the next step. In this subsequent step, the outer edge of a secondthermoplastic protection layer 6 is folded around the outer edge of the already thermocompressed outer edge formed from the firstthermoplastic protection layer 6 and thewater transfer layer 5, seeFIG. 9 c. In the last step, this second three-layered outer edge area is again thermocompressed in order to provide for an outer edge region with excellent stability and further improved leak tightness. In principle, these four steps can be realized on all four outer edges of thewater transfer compound 4. It is however preferred that it is realized on two edges only which extend in the feeding direction of the layers. In this respect, it is most preferred that the thermocompression is realized in a continuous process using heated rolls. -
FIG. 10 illustrates an exemplary alternative procedure and production arrangement for the production of a humidifier. Thearrangement 13 for the continuous supply of the water transfer layer 5 e from themiddle coil 15 and of the porousthermoplastic layers 6 is realized as in the example ofFIG. 5 a. However, the thermocompression is achieved here in two steps. The lateral outer edges of the water transfer compound are thermocompressed usingheated rolls station 24. To this end, the layers are fed using guiding rolls 23. Only subsequently, thermocompression of the water transfer layer and the thermoplastic protection layers in a transverse direction is realized in anarrangement 14. The subsequent workingstations FIG. 7 a. -
- 1; H humidifier
- 2.1 first flow plate
- 2.2 second flow plate
- 3 channel structures
- 4 water transfer compound
- 5 water transfer layer
- 6 thermoplastic protection layer
- 7 opening
- 8 humidifier module
- 9 endplate
- 10 first overlapping area
- 11 second overlapping area
- 12 positioning hole
- 13 arrangement for continuous or discontinuous feed
- 14 arrangement for thermocompression
- 15 coil
- 16 cutting arrangement
- 17 cutting using laser
- 18 stacking arrangement
- 19 sections of the water transfer compound
- 22 vacuum gripper
- 23 guiding rolls
- 24 working station for thermocompression
- 27 supply lines to the channel structures
- 28 spatially separated working station
- 30 additional material, gluing and/or sealing
- 34, 34′ heated rolls
- A second inlet for the supply of humid gases
- B first inlet for the supply of dried gases
- C first outlet for the release of humidified gases
- D second outlet for the release of dehumidified gases
- K compressor
- S fuel cell stack
- d1, d2 thickness
Claims (31)
1-50. (canceled)
51. A water transfer compound for use for the humidification of process gases for fuel cells, comprising:
a water-permeable and essentially gas-impermeable water transfer layer as well as
at least one thermoplastic protection layer which is water- and gas-permeable at least in sections, where
the water transfer layer and the thermoplastic protection layer overlap each other at least in sections and comprise a first and a second overlapping area, where
the water transfer layer in the first overlapping area is accessible for humid gases through the thermoplastic protection layer and
the water transfer compound is thermocompressed in the second overlapping area so that the water transfer layer in the second overlapping area is not accessible for humid gases through the compressed thermoplastic protection layer.
52. The compound according to claim 51 , wherein the thermoplastic protection layer is arranged on both sides of the water transfer layer, respectively.
53. The compound according to claim 51 , wherein the second overlapping area compared to the first overlapping area shows a reduced thickness.
54. The compound according to claim 51 , wherein the second overlapping area delimits the first overlapping area at least at two longitudinal edges of the first overlapping area.
55. The compound according to claim 51 , wherein the second overlapping area surrounds the first overlapping area circumferentially.
56. The compound according to claim 51 , wherein a thickness in the first overlapping area ranges between 35 and 600 μm.
57. The compound according to claim 56 , wherein a thickness in the second overlapping area corresponds to between 10 and 75% of the thickness of the first overlapping area.
58. The compound according to claim 51 , wherein the thermoplastic protection layer in the first overlapping area is porous and has a porosity of approximately 50 to 95%.
59. The compound according to claim 51 , wherein the thermoplastic protection layer in the second overlapping area is non-porous.
60. The compound according to claim 51 , wherein the second overlapping area comprises openings selected from the group consisting of cut-out openings, punched-out openings and openings removed by a laser.
61. The compound according to claim 51 , wherein an outer contour of the compound at least in sections in or at the second overlapping area is selected from the group consisting of a cut-out outer contour, a punched-out outer contour and a laser reshaped outer contour.
62. The compound according to claim 51 , wherein the thermoplastic protection layer comprises polyester, polypropylene, polyethylene, polyvinylidene fluoride, polytetrafluorethylene, polyphtalamide, polyethylene terephthalate and/or polybutylene terephthalate.
63. The compound according to claim 51 , wherein the water transfer layer is a non-reinforced membrane.
64. The compound according to claim 63 , wherein the non-reinforced membrane rests on a support medium selected from the group consisting of thermoplastic fiber paper, fiber roving, fleece, and fiber weave made from polymeric fibers.
65. The compound according to claim 51 , wherein the water transfer layer is a reinforced membrane.
66. The compound according to claim 65 , wherein the water transfer membrane is selected from the group consisting of a coated weave, an impregnated weave, a membrane laminate, a membrane impregnated with ions, an ionomeric membrane, a hydrophilic membrane and a diaphragm.
67. The compound according to claim 51 , further comprising a humidifier module for the humidification of process gases of fuel cells, comprising:
at least a first as well as a second flow plate,
where the first and second flow plate each comprise channel structures for the guidance of gases.
68. The compound according to claim 67 , wherein the second overlapping area is adhesively connected with the first and/or the second flow plate at least in sections.
69. The compound according to claim 68 , wherein the adhesive connection is located in an outer edge area and/or of the first and/or second flow plate.
70. The compound according to claim 69 , wherein the connection is glued, melted, or welded.
71. The compound according to claim 67 , wherein the first and/or the second flow plate comprises a sealing area, which surrounds the channel structures, with the water transfer compound being connected in a non-positive manner with the first and/or second flow plate by being placed onto the sealing area.
72. The compound according to claim 67 , wherein the first and second flow plate each comprise a sealing area surrounding the channel structures, with the first and second flow plate comprising structures complimentary to each other at least in sections in the sealing area and with the water transfer compound being clamped between these complimentary structures and compressed in a positive and non-positive manner.
73. The compound according to claim 67 , wherein the first and/or the second flow plate comprise openings for guiding media in the stack direction, which openings overlap at least partially with the openings in the second overlapping area of the water transfer compound.
74. The compound according to claim 67 , wherein the first and/or second flow plate comprises openings for guiding media in the stack direction, with all openings for guiding media being arranged outside of the area of the respective flow plate which is covered by the water transfer compound.
75. The compound according to claim 67 , wherein the flow plates at least in sections are produced from thermoplastic, elastomeric or thermoset plastics and/or at least in sections consist of corrosion-stable, metallic materials.
76. The compound according to claim 67 , wherein the first overlapping area of the water transfer compound at least in sections overlaps with the channel structures of the first and second flow plate.
77. The compound according to claim 67 , wherein the first and the second flow plate are different from each other with respect to at least one of choice of material, form of channel(s), direction of channel(s) and sealing contour.
78. The compound according to claim 67 , wherein the first or the second flow plate with geometry A and the first or the second flow plate with geometry B are provided and that the layering sequence of these flow plates is A-B-A-B.
79. The compound according to claim 78 , wherein the flow plates each show channel structures on both of their surfaces and that a water transfer compound is arranged between the surfaces comprising channel structures, respectively.
80. The compound according to claim 67 , further comprising:
a first inlet for feeding dry gases as well as a first outlet for releasing humidified gases, and
a second inlet for feeding humid gases as well as a second outlet for releasing dehumidified gases,
at least one humidifier module, where
the channel structures of the humidifier module are connected to at least one of the above-mentioned in- or outlets, respectively.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE202013003566.8 | 2013-04-09 | ||
DE202013003566.8U DE202013003566U1 (en) | 2013-04-09 | 2013-04-09 | Water Transfer Association |
PCT/EP2014/056806 WO2014166832A1 (en) | 2013-04-09 | 2014-04-04 | Water transfer compound |
Publications (1)
Publication Number | Publication Date |
---|---|
US20160079615A1 true US20160079615A1 (en) | 2016-03-17 |
Family
ID=50439390
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US14/392,093 Abandoned US20160079615A1 (en) | 2013-04-09 | 2014-04-04 | Water transfer compound |
US14/392,092 Active 2035-01-31 US10084195B2 (en) | 2013-04-09 | 2015-10-05 | Method for the production of a water transfer compound |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US14/392,092 Active 2035-01-31 US10084195B2 (en) | 2013-04-09 | 2015-10-05 | Method for the production of a water transfer compound |
Country Status (5)
Country | Link |
---|---|
US (2) | US20160079615A1 (en) |
JP (1) | JP6202771B2 (en) |
CN (1) | CN105103355B (en) |
DE (2) | DE202013003566U1 (en) |
WO (1) | WO2014166832A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20190305336A1 (en) * | 2016-09-23 | 2019-10-03 | Reinz-Dichtungs-Gmbh | Flow plate for a humidifier |
US20220013794A1 (en) * | 2020-07-10 | 2022-01-13 | Reinz-Dichtungs-Gmbh | Bipolar plate, retention sample for a bipolar plate, system, and method for producing and testing a bipolar plate |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102016010733A1 (en) * | 2015-09-22 | 2017-03-23 | Mann + Hummel Gmbh | A multi-component medium for use in a humidifier of known design |
DE202016100670U1 (en) * | 2016-02-10 | 2017-05-11 | Reinz-Dichtungs-Gmbh | Flow plate for a humidifier |
DE202016105309U1 (en) | 2016-09-23 | 2018-01-09 | Reinz-Dichtungs-Gmbh | humidifier |
CN112638509B (en) * | 2018-09-27 | 2023-01-13 | 卡姆帕特薄膜系统公司 | Method for humidifying facilitated transport membranes |
DE102019217301A1 (en) | 2018-11-16 | 2020-06-04 | Mahle International Gmbh | Humidification module for humidifying a fluid |
DE102019126298A1 (en) * | 2019-09-30 | 2021-04-01 | Audi Ag | Humidifier, fuel cell device with humidifier and motor vehicle |
DE102020214585A1 (en) | 2020-11-19 | 2022-05-19 | Mahle International Gmbh | humidifier and fuel cell system |
CN113178597B (en) * | 2021-04-20 | 2023-03-28 | 内蒙古民族大学 | Fixing structure of fuel cell driven by hydrogen energy source |
DE102022214349A1 (en) | 2022-12-22 | 2024-06-27 | Mahle International Gmbh | Multilayer membrane, membrane stack, humidifier |
DE102022214348A1 (en) | 2022-12-22 | 2024-06-27 | Mahle International Gmbh | Multilayer membrane, membrane stack, humidifier |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TW550851B (en) | 2002-07-17 | 2003-09-01 | Asia Pacific Fuel Cell Tech | Fuel battery having moisturizing module |
JP3910518B2 (en) * | 2002-10-16 | 2007-04-25 | 本田技研工業株式会社 | Membrane humidifier for fuel cell |
EP1526597A1 (en) | 2003-10-25 | 2005-04-27 | P 21-Power for the 21st Century GmbH | Device for humidification of effluents of media in fuel cells |
US7753991B2 (en) * | 2004-07-30 | 2010-07-13 | Kertzman Systems, Inc. | Water transport method and assembly including a thin film membrane for the addition or removal of water from gases or liquids |
JP2006156099A (en) * | 2004-11-29 | 2006-06-15 | Mitsubishi Electric Corp | Humidifier and its manufacturing method |
JP2008010334A (en) * | 2006-06-30 | 2008-01-17 | Toyota Motor Corp | Temperature/humidity exchanger for fuel cell, and manufacturing method of temperature/humidity exchanger for fuel cell |
US8048585B2 (en) * | 2007-10-08 | 2011-11-01 | GM Global Technology Operations LLC | Fuel cell membrane humidifier plate design |
JP5156504B2 (en) * | 2008-06-25 | 2013-03-06 | 日本ゴア株式会社 | Composite membrane and moisture adjustment module using the same |
US8669019B2 (en) * | 2010-05-27 | 2014-03-11 | GM Global Technology Operations LLC | Water vapor transfer membrane attachment to gas diffusion separators |
US8709199B2 (en) | 2011-09-13 | 2014-04-29 | GM Global Technology Operations LLC | Method of preparing a water vapor transfer membrane |
DE202011109654U1 (en) * | 2011-12-23 | 2013-01-03 | Reinz-Dichtungs-Gmbh | Flow plate assembly for membrane stacks |
-
2013
- 2013-04-09 DE DE202013003566.8U patent/DE202013003566U1/en not_active Expired - Lifetime
-
2014
- 2014-04-04 JP JP2016506857A patent/JP6202771B2/en not_active Expired - Fee Related
- 2014-04-04 DE DE112014001881.3T patent/DE112014001881B4/en active Active
- 2014-04-04 WO PCT/EP2014/056806 patent/WO2014166832A1/en active Application Filing
- 2014-04-04 CN CN201480020518.XA patent/CN105103355B/en active Active
- 2014-04-04 US US14/392,093 patent/US20160079615A1/en not_active Abandoned
-
2015
- 2015-10-05 US US14/392,092 patent/US10084195B2/en active Active
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20190305336A1 (en) * | 2016-09-23 | 2019-10-03 | Reinz-Dichtungs-Gmbh | Flow plate for a humidifier |
US11631869B2 (en) * | 2016-09-23 | 2023-04-18 | Reinz-Dichtungs-Gmbh | Flow plate for a humidifier |
US20220013794A1 (en) * | 2020-07-10 | 2022-01-13 | Reinz-Dichtungs-Gmbh | Bipolar plate, retention sample for a bipolar plate, system, and method for producing and testing a bipolar plate |
Also Published As
Publication number | Publication date |
---|---|
CN105103355A (en) | 2015-11-25 |
WO2014166832A1 (en) | 2014-10-16 |
DE112014001881T5 (en) | 2015-12-24 |
DE112014001881B4 (en) | 2022-08-04 |
CN105103355B (en) | 2018-05-22 |
US20160056483A1 (en) | 2016-02-25 |
JP2016520958A (en) | 2016-07-14 |
DE202013003566U1 (en) | 2014-07-11 |
JP6202771B2 (en) | 2017-09-27 |
US10084195B2 (en) | 2018-09-25 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US10084195B2 (en) | Method for the production of a water transfer compound | |
KR20120117266A (en) | Apparatus for manufacturing membrane-electrode assembly | |
KR102187450B1 (en) | Device and method for manufacturing membrane-electrode assembly of fuel cell | |
US20170256810A1 (en) | Manufacturing device and manufacturing method of fuel cell component | |
US9203097B2 (en) | Discretely supported wet side plates | |
KR20060093128A (en) | Manufacture of fuel cell | |
WO2005106998A1 (en) | Separator for fuel cell, method for bonding separator, and fuel cell | |
CN112567553A (en) | Electrochemical system | |
KR102067252B1 (en) | Equipment for manufacturing separator for fuel cell and method of manufacturing the same | |
WO2008056661A1 (en) | Film-film reinforcing film assembly, film-catalyst layer assembly, film-electrode assembly, and polymer electrolyte fuel cell | |
DE102012218303A1 (en) | Method for producing humidifier for humidification of process gases for fuel cell, involves stacking generated strips on humidifier stack which is laminated with water-permeable membrane | |
JP2009134953A (en) | Membrane electrode assembly with frame, and method of continuously manufacturing fuel battery cell | |
JP2022080281A (en) | Lamination unit for humidifier | |
US20210126266A1 (en) | Method for producing an electrochemically active unit and support element for an assembly of an electrochemically active unit | |
JP6442554B2 (en) | Manufacturing method and apparatus for electrolyte membrane / electrode structure with resin frame | |
JP2006147231A (en) | Junction device for membrane electrode assembly and junction method for membrane electrode assembly | |
JP2007207454A (en) | Fuel cell stack | |
CN113054154A (en) | Hot press molding method and hot press molding device for pole piece | |
US8778558B2 (en) | Methods for making a thermoformed subgasket and products thereof | |
US20230089216A1 (en) | Insert for cell frame integrated with adhesive film and method of manufacturing cell frame using the same | |
JP2005166385A (en) | Manufacturing method and manufacturing device of fuel cell stack | |
JP2020138173A (en) | Layered body for vapor permeable film and manufacturing method thereof | |
JP2010040338A (en) | Method and apparatus for manufacturing fuel cell stack, and fuel cell stack | |
JP7041655B2 (en) | Manufacturing method of electrolyte / electrode structure | |
JP5675477B2 (en) | Manufacturing method of electrolyte membrane / electrode structure for fuel cell |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: REINZ-DICHTUNGS-GMBH, GERMANY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:SCHERER, JOACHIM;GLUECK, RAINER;STOEHR, THOMAS;AND OTHERS;SIGNING DATES FROM 20150831 TO 20150907;REEL/FRAME:036922/0153 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |