WO2017029158A1 - Separatorplatte für ein elektrochemisches system - Google Patents
Separatorplatte für ein elektrochemisches system Download PDFInfo
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- WO2017029158A1 WO2017029158A1 PCT/EP2016/068956 EP2016068956W WO2017029158A1 WO 2017029158 A1 WO2017029158 A1 WO 2017029158A1 EP 2016068956 W EP2016068956 W EP 2016068956W WO 2017029158 A1 WO2017029158 A1 WO 2017029158A1
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- Prior art keywords
- channels
- single plate
- web
- plate
- webs
- Prior art date
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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
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/0204—Non-porous and characterised by the material
- H01M8/0206—Metals or alloys
-
- 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
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/0247—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the form
-
- 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
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/0247—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the form
- H01M8/0254—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the form corrugated or undulated
-
- 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
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/0258—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant
-
- 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
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/0258—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant
- H01M8/026—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant characterised by grooves, e.g. their pitch or depth
-
- 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
- H01M8/02—Details
- H01M8/0297—Arrangements for joining electrodes, reservoir layers, heat exchange units or bipolar separators to each other
-
- 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
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/0267—Collectors; Separators, e.g. bipolar separators; Interconnectors having heating or cooling means, e.g. heaters or coolant flow channels
-
- 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
- H01M8/10—Fuel cells with solid electrolytes
-
- 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
Definitions
- the invention relates to a separator plate for an electrochemical system.
- electrochemical systems such as fuel cell systems or electrochemical compressor systems and electrolyzers as well as humidifiers for electrochemical systems, usually comprise a plurality of separator plates, which are arranged in a stack, so that each two adjacent Separatorplatten an electrochemical cell or a
- the separator plates usually each comprise two individual plates which are connected to one another along their rear sides remote from the electrochemical cells or the humidifier cells.
- the Separatorplatten can z.
- bipolar plates are frequently used as separator plates.
- electrochemical system In the context of this invention, it also includes humidifier systems for other electrochemical systems.
- the individual plates of the separator plates can have channel structures for supplying the cells with one or more media and / or for removing media.
- the media may be, for example, fuels (eg, hydrogen or methanol), reaction gases (eg, air or oxygen), or a coolant as supplied media, and reaction products and heated coolant as discharged media.
- the separator plates for forwarding in the electrochemical
- the electrochemical cells in particular a fuel cell, for. B. each comprise a membrane electrode assembly (Membrane Electrode Assemblies or MEA), each with a polymer electrolyte membrane (PEM).
- MEA Membrane Electrode Assemblies
- PEM polymer electrolyte membrane
- the MEA may also have one or more gas diffusion layers (GDL), which are usually oriented towards the separator plates, in particular to bipolar plates of fuel cell systems and z.
- GDL gas diffusion layers
- the cell is formed by a substantially gas-impermeable but water-permeable membrane, which may be supported by support media, as well as by at least one, preferably both sides of a diffusion medium of a textile or carbon nonwoven.
- Pressure of the coolant passed between the individual plates can then lead to breakage of the connections, for example tearing between the plates or e.g. a Sch spapfropf is torn from one or both individual plates, so that at least in a plate, a hole is formed. Additionally or alternatively, the offset can also lead to too much energy is entered into a point of a single plate and burns them, so that also creates a hole. Thus, the individual plates along the joints can be damaged to the point of uselessness. This can cause the between adjacent ones
- Moisture cells are flooded with a guided between the individual plates cooling fluid that passes through the cracks in the individual plates through the individual plates. Also, there may be a direct uncontrolled reaction between the reaction media, if both single plate holes. Both can lead to the failure of the entire stack.
- the present invention is therefore based on the object, a
- separator plate for an electrochemical system, which is as stable as possible in a region in which the channels of the individual plates of the separator plate are crossed relative to each other and which can be produced with the least possible rejects.
- a separator plate for an electrochemical system which has a first single plate and a second single plate connected to the first single plate.
- the first individual plate comprises at least two first channels, which are formed in the first individual plate and run alongside one another, for media guidance, which are separated from one another at least in sections by a web formed between the first channels.
- the second single plate comprises a molded into the second single plate second channel for media management.
- the web formed between the first channels and the second channel formed in the second individual plate are designed and arranged such that a projection of the second channel onto the first single plate perpendicular to the planar surface plane of the first individual plate the web in an intersection region of the web and / or along the Crossing area crosses.
- the proposed Separatorplatte is characterized in particular by the fact that the web is lowered in the crossing region of the web, so that the both sides of the web extending first channels via the reduction of the web in fluid communication, and that one of the second single plate facing back of the bottom of the lowering of the Web is connected in the crossing region cohesively with one of the first single plate facing back of the bottom of the second channel.
- the shorter formulation is used below for simplicity, after which Channels and / or the webs of the second single plate crossing the webs and / or the channels of the first single plate or vice versa.
- first channels extending on either side of the web are in fluid communication via the depression of the web, the positioning of the first channel can be achieved
- Reduction along the first channels can also be used selectively to influence the flow behavior of the media in the first channels and in the space between the individual plates.
- the web lowering can with respect to their contact surface with at least one
- Channel of the other single plate be formed so that it extends along the direction of the web in the region of the lowering, ie parallel to the direction of the two sides of the web extending channels over a length which is at most five times or at most three times the largest width of at least one crossed by him channel or any crossed by him bridge each at half their height. This makes it possible to ensure that the flow behavior of the medium in the channels is no longer influenced or impaired by the bar lowering. In order to achieve the benefits associated with the web lowering, however, it is desirable that the length of the web lowering along the running direction of the web or along the direction of both sides of the web extending channels at least 0.5 times the width of the crossed channel in the Floor area is.
- first single plate a plurality of juxtaposed extending first channels for media management may be formed, wherein adjacent channels of the plurality of first channels are each at least partially separated by a web.
- second channels for media guidance can be formed in the second single plate, wherein the first channels, the webs of the first single plate and the second channels can be configured and arranged such that projections of the second channels perpendicular to the first single plate to the planar surface plane of the first single plate, the webs of the first single plate in each case intersect along one or more crossing regions of the webs.
- the webs of the first single plate can be lowered in these crossing regions or at least in some of the crossing regions, so that the first channels extending on either side of the respective web of the first single plate are in fluid communication via the depression of this web.
- Single plate can then in turn be cohesively connected to one of the first single plate facing back of the bottom of the web of the first single plate crossing second channel of the second single plate.
- the stability and longevity of the separator plate can be increased by a sufficiently large number of web depressions in the crossing regions of the webs of the first individual board and of the cohesive connection formed in this crossing region.
- the choice of positions for the web depressions between adjacent channels can purposefully influence the flow behavior (eg medium flow rate, hydrostatic pressure, flow velocity) of the medium in the first channels .
- the targeted placement of the cohesive connections between the first and the second single plate can also serve to influence the flow behavior of a guided between the two individual plates cooling medium, typically to homogenize.
- the number and arrangement of the web depressions and cohesive connections in the region of web depressions is preferably chosen such that a balance results between optimum flow guidance of these media and optimum longevity of the separator plate. It is particularly advantageous if the Reductions are arranged so that they lie substantially in extension of the coolant supply lines.
- adjacent channels of the plurality of second channels of the second single plate can each be separated by a web.
- These webs of the second single plate and the first channels of the first single plate can be designed and arranged such that projections of the first channels perpendicular to the planar surface plane of the second single plate on the second single plate cross the webs of the second single plate along one or more crossing regions of the webs.
- Single plate may be lowered in the crossing regions or at least in some of the crossing regions, so that the two channels extending on either side of the respective web are in fluid communication via the depression of this web.
- One of the first single plate facing back of the bottom of the lowering of the respective web of the second single plate can be materially connected in this case with a second single plate facing back of the bottom of the web of the second single plate crossing first channel.
- This arrangement provides the advantages already described above in terms of stability, longevity and improved flow behavior of the guided in the channels of the individual plates media.
- a plurality of depressions may be formed with cohesive connections of the type described.
- the media which are guided or can be guided in the first and / or second channels can be reaction gases, fuels as well
- the media guided or routable in the first and / or second channels can be, in particular, moist gas, gas to be humidified and, in the further course, depleted humid gas and at least partially humidified gas.
- the webs and channels of the individual plates can be designed and arranged such that the same first or second channel in each case crosses two or more adjacent webs and channels of the respective other single plate. In the crossing areas defined by this channel of the two or more adjacent webs of each other single plate can be formed in turn depressions with cohesive connections of the type described.
- the first channels can be designed such that they run straight at least in sections, in particular parallel to one another. Alternatively or additionally, the first channels may extend fan-shaped at least in sections. Alternatively or additionally, the first channels may be curved at least in sections, in particular in a circular arc section or in a wave shape.
- first channels can also apply to the course of the second channels, with identical, similar or different channel courses being able to be present on both individual plates.
- profile of the first and / or the second channels can be adapted in many ways to the geometry of the various functional regions of the respective single plate.
- the individual plates are formed as metal plates, for. As plates made of steel or stainless steel.
- the individual plates may be at least partially coated on at least one of their surfaces, in particular with a coating for corrosion prevention and / or improvement of the electrical conductivity.
- the cohesive connection or the cohesive connections between the backs of the web subsidence and the backs of the channel bottoms of the individual plates can
- the individual plates can in each case have a thickness between 50 ⁇ and 150 ⁇ , preferably between 70 ⁇ and 110 ⁇ , which are determined perpendicular to the planar surface plane of the respective individual plate, in each case including or excluding the stated limit values.
- the channels and the webs can z. B. be embossed in the individual plates. Sheets of said thickness have a low weight and good formability with sufficient stability.
- the cohesive connection at the back of the bottom of the lowering of the web of a single plate can be relative to the main extension direction of the channel of the other single plate, with the rear side connects the back of the web lowering, at an angle of -25 ° to + 25 °, in particular of 10 ° to + 10 °.
- the deviation of the alignment of the integral connection from the course direction of the respective channel can be greater, the wider the contact surface between the back of the web drop and the back of the channel bottom in the respective crossing region or along the respective crossing region.
- the cohesive connection may extend continuously or in sections over a length at the back of the bottom of the web lowering of one of the individual plates, which corresponds to at least twice, preferably at least five times, in particular at least ten times, the width of the cohesive connection.
- the cohesive connection may extend at least in sections over a length which corresponds at least to the width of the web in the respective intersection region, preferably at least twice the web width in the intersection region.
- Length of the cohesive connection may also correspond at least to the width or at least the average width of one of the two sides of the respective web extending channels.
- the connecting seam formed by the material connection can be connected.
- the connecting seam can also have line-shaped or punctiform sections. The compound can be longer, the more the angle, which spans the bridge with the channel crossed by him, deviates from 90 °.
- the bottom of the respective web drop of the first and / or the second single plate can each be continuously lowered to the bottoms of adjacent to this web channels.
- the other single plate facing backs of the bottom of the web lowering and adjoining the web lowering channel bottoms can, for. B. be formed so that they lie in a plane.
- the cohesive connection can then follow the course of the channel connected or to be connected to the web transverse (but not necessarily perpendicular) to the course of the web and to the course of adjacent to the web channels over the entire width of the web and additionally on extend the entire width of the adjacent channels or across the entire width of at least one of the adjacent channels. This can advantageously contribute to the stability and longevity of the cohesive connection.
- a first end of the first and / or second channels may be in fluid communication with at least a portion of an active area of the respective single plate.
- a second end of the first and / or the second channels may each be in fluid communication with a passage opening of the separator plate.
- the passage opening can z. B. be set up to supply a medium to the active area or for discharging a medium from the active area.
- Separator plates of the stack typically include channels in the stack that traverse the stack along the stacking direction. These channels can be fed to the stack media. Likewise, media can be removed from the stack via these channels.
- the individual plates may have the through holes enclosing beads for sealing the respective passage opening. The first end of the first channels and / or the second channels can then z. B. be in fluid communication with a sift passage for passing a medium through the respective bead.
- the first channels and / or the second channels may form at least part of a distribution region of the respective single plate, which is also referred to as a feed region or discharge region of the single plate.
- the distribution region may each have a first edge region in which the first and the second channels are in fluid communication with at least part of an active region of the respective single plate, and may each have one second edge region, in which the first and the second channels are each in fluid communication with a passage opening of the separator plate.
- the passage opening serves to supply a medium to the active area or to discharge a medium from the active area via the distribution area.
- This distribution region can in particular extend between two channel branches of at least one, preferably a plurality of channels. With these channel branches can be realized in each case a multiplication of the number of channels or a reduction of the number of channels.
- the channel branch may comprise a transition of the aforementioned bead passage to the feed or discharge area.
- the channel branches extend in the two aforementioned edge regions of the distribution region.
- both channel branches of a channel adjacent to a distribution region in the flow direction either have both an increase or both a reduction in the number of channels.
- Such distribution areas span an approximately triangular area.
- the channels of the distribution area run essentially transversely to the direction of the channels in the active area.
- the total length of the mutually parallel channels is therefore usually very different and there are often some short marginal channels or webs. If one considers those 80% of the channels or webs which have the greatest overall length within a distribution region, their web portions between the depressions have a length of at least 10 mm, preferably at least 12 mm. Here, however, only the web sections are considered between the subsidence, terminal web sections are often shorter.
- the distribution areas in addition to the parallel to the planar surface plane of the respective individual plate extending channel areas and land areas and connecting the channel and land areas, the plane plane of the respective single plate transverse areas even further, on a different level than the channel areas and the web areas have areas extending parallel to the plane of the plane.
- This can be advantageous, for example, for optimizing the pressure drop or the volume flow.
- the Distribution areas - apart from edge areas - consist of the aforementioned channel and web areas and the channel and web areas connecting, transverse to the planar surface plane of the respective single plate areas, of which the channel and land areas each extending in exactly one plane.
- the at least one distribution region of a single plate therefore has regions which extend parallel to the planar surface plane of the respective individual plate, specifically in such a way that the regions are distributed over exactly two planes.
- the illustrated examples all relate to a bipolar plate for a fuel cell system.
- the electrochemical system may also be formed as an electrolyzer, compressor or as a humidifier for an electrochemical system and have separator plates.
- the invention essential to lowering the channel and arranged there connection of the individual plates is shown below only for the distribution of a separator plate.
- FIG. 3 shows a section through the stack from FIG. 1, wherein the sectional plane is oriented perpendicular to the planar surface plane of the plates of the stack;
- FIG. 4 shows excerpts of plan views of the surfaces of a bipolar plate according to the invention, of a section through the active region of the bipolar plate and a view through this bipolar plate;
- FIG. 5 shows detailed views of a section through two different bipolar plates according to the invention in the region of a lowered web
- FIG. 6 is a plan view of the crossing region of a lowered web with a channel in a bipolar plate according to the invention.
- Bipolar plates each with at least one crossing region, in each case in the cutout.
- Fig. 1 shows an electrochemical system 1 with a stack 2 of identical separator plates, which are stacked along a z-direction 7 and clamped between two end plates 3, 4.
- the separator plates are designed here as bipolar plates and each comprise two interconnected individual plates.
- the system 1 is a fuel cell stack. Each two adjacent bipolar plates of the stack 2 thus include between them an electrochemical cell which serves to convert chemical energy into electrical energy.
- the electrochemical cells have z. B. each have a membrane electrode unit (MEA) and gas diffusion layers (GDL).
- the system 1 may also be configured as an electrolyzer, compressor, or as a humidifier for an electrochemical system, such as a fuel cell system. In these electrochemical systems are also
- the end plate 4 has a plurality of ports 5, via which the system 1 media can be fed and discharged via the media from the system 1.
- These system 1 can be fed and discharged from the system 1 media can, for.
- fuels such as molecular hydrogen or methanol, reaction gases such as air or oxygen, reaction products such as water vapor or coolant such as water and / or glycol.
- Fig. 2 shows a part of a bipolar plate 100 of the stack 2 of FIG. 1 in a plan view, in particular a part of a first metal single plate 100a of the bipolar plate 100.
- Fig. 3 shows a section through part of the stack 2 of Fig. 1, wherein the sectional plane is aligned parallel to the z-axis 7 and extends along the section line 11 shown in FIG.
- FIG. 3 shows that the bipolar plate 100 comprises, in addition to the first individual plate 100a, a second individual plate 100b, wherein the individual plates 100a, 100b are bonded to one another in regions in a materially joined manner to form the bipolar plate 100 on their mutually facing rear sides of the plates.
- the individual plates 100a, 100b are formed as metal sheets, in particular as stainless steel sheets.
- the individual plates 100a, 100b may be made at least partially of non-metallic materials, e.g. B. of heat-resistant, preferably electrically conductive plastic.
- the individual plates 100a, 100b each have a thickness 190a, 190b (see FIG. 5) of 100 ⁇ m perpendicular to their planar surface plane.
- the individual plates 100a, 100b are connected to one another in regions by laser welding connections along their mutually facing rear sides.
- the individual plates 100a, 100b may be partially connected by other cohesive connections, z. B. by other welds, by solder joints or by adhesive bonds.
- Fig. 3 also shows another, the bipolar plate 100 of identical design
- the bipolar plate 100 shown in FIG. 2 has passage openings 110, 120, 130.
- the passage openings 110, 120, 130 form with the remaining bipolar plates of the stack 2 of FIG. 1 lines for media supply and removal. These conduits pass through the stack 2 in the z direction 7 and are each in fluid communication with one of the ports 5 shown in FIG.
- the bipolar plate 100 Around the through-openings 110, 120, 130, the bipolar plate 100 has beads 111, 121, 131 formed in the bipolar plate 100.
- the beads are formed in the bipolar plate 100.
- a further bead 141 surrounds the passage openings 110, 130, the beads 111, 131 and an active region of the single plate 100a which adjoins the left-hand end of FIG. 2, but which is shown in FIG. 2 only in a very short section 167a.
- the bead 141 serves to seal the active area and the through-openings 110, 130 of the single plate 100a against the through-opening 120 and the surroundings.
- this active region 167a delimits an electrochemical cell which exists between the single plate 100a and one of the
- Bipolar plate 100 adjacent bipolar plate of the stack 2 is arranged.
- FIG. 2 shows that the beads 111, 121, 131 each have passages 112, 122, 132 transversely through the beads 111, 121, 131.
- These feedthroughs 112, 122, 132 also referred to as sip passages, each serve for the targeted and metered passage of a medium through the beads 111, 121, 131.
- the passages 112, 122, 132 serve in the beads 111, 121, 131 in each case the production of a fluid connection between the lines formed by the through-holes 110, 120, 130 and the media distribution channels 160a and finally the active region 167a
- Bipolar plate 100 or between the lines and a spanned between the individual plates 100a, 100b cavity 18 (FIG. 3), which is designed for receiving and circulation of a coolant.
- the single plate 100a has, on its front side remote from the second individual plate 100b, a distribution region 150a with a multiplicity of channels 160a for media guidance.
- the channels 160a are formed in the single plate 100a, in particular stamped.
- the channels 160a are mostly straight and parallel to each other. Sectionwise, namely in the transition 165a from the distribution area 150a to the active area
- the channels 160a are curved. Those channels 160a, the upper extend halfway through the center of the through hole 130, also have a kink.
- the channels 160a are each embossed as recesses in the single plate 100a, wherein between each two adjacent channels 160a a respective web 170a is formed, which fluidly separates the channels 160a or at least partially separates fluidically.
- the distribution region 150a thus has a multiplicity of webs 170a.
- the channels 160a have at their respective half height a smaller width 161a than the webs 170a formed between the channels 160a, the width of which is denoted by 171a.
- the widths 161a of the channels 160a are z. Each about 0.2 mm (see Figures 5 and 6).
- the channels 160a and the lands 170a each extend over a length of between about 1.5 cm and 11 cm.
- the distribution region 150a of the first single plate 100a with the channels 160a establishes a fluid connection between the line of the stack 2 formed by the passage opening 130 and an active region 167a of the first single plate 100a on the front side of the first single plate 100a facing away from the second single plate 100b ,
- a medium conducted in the conduit formed by the passage opening 130 can be guided via the sip passage 132 and via the channels 160a into the active region 167a of the first single plate 100a or vice versa.
- the channels 160a continue in channels of the active region 167a, yet one end, namely the second end of the channels 160a, is defined in the transition region 165a.
- second ends 162a of the channels 160a are in fluid communication with the active region 167a of the first single plate 100a, where they merge into other channels.
- First ends 163a of the channels 160a are in fluid communication with the through-opening 130 of the bipolar plate 100 or with the feed or discharge line of the stack 2 formed by the through-opening 130, in particular via the sipe passage 132.
- the channels 160a fan out, wherein the channels 160a in the illustrated embodiment, with the exception of the few channels 160a with kinks substantially parallel.
- a cross-section of the channels 160a thus increases in each case, since in the active region 167a, if necessary, further webs are formed there.
- the number of channels 160a is greater than the number of bushings 132 through the bead 131, z. B.
- a transition region 164a between the bead 131 and the through hole 130 facing ends 163a of the channels 160a is thus a branch region of the first single plate 100a. In this branching region, the number of channels that fluidly connect the through-hole 130 with the active region of the first single plate 100a increases.
- the number of channels or channel-like structures for media guidance is again greater than that
- a transition region 165a between the active region 167a of the first single plate 100a facing ends 162a of the channels 160a and the active region 167a of the first single plate 100a thus again provides a branching region the first single plate
- the channels 160a are arranged between two branching regions of the first single plate 100a.
- 4c shows a section of the distribution region 150a on the front side of the first single plate 100a facing away from the second individual plate 100b, with the first channels 160a and with the webs 170a arranged between the first channels 160a. 4c further shows, in sections, the passage opening 130 and the bead 131 surrounding the passage opening 130 and a short section 167a of the active area of the first single plate 100a. Clearly visible are the branching regions 164a and 165a, in which the number of channels fluidly connecting the through-hole 130 to the active region 167a of the first single plate 100a increases from the through-hole 130 to the active region 167a, respectively.
- FIG. 4a shows a section of a distribution region 150b on the front side of the second single plate 100b facing away from the first individual plate 100a.
- FIG. 4 a additionally shows, in sections, the through-opening 130 and the bead 131 b enclosing the through-opening 130 in this layer as well as a short section 167 b of the active region of the second individual part. plate 100b.
- the distribution region 150b of the second single plate 100b has a multiplicity of channels 160b and a plurality of webs 170b respectively arranged between two adjacent channels 160b, the webs 170b respectively fluidically separating the channels 160b at least in sections.
- the channels 160b of the second single plate 100b provide fluid communication between a through opening 130 of the bipolar plate 100 and the active region 167b of the second single plate 100b on the front side of the second single plate 100b facing away from the first single plate 100a ,
- FIGS. 4a and 4c shows a section through the bipolar plate 100 according to the invention from FIGS. 4a and 4c through the active area, namely the left outer edge of Fig. 4a and the right outer edge of Fig. 4c, while the two individual plates 100a, 100b are recognizable in the joined state.
- Fig. 4d shows the entire bipolar plate 100, which also already in Fign. 4a-c, but now in view through the two individual plates 100a, 100b, with the single plate 100a shown in FIG. 4c at the top. Due to the intersecting channels 160a and 160b or intersecting webs
- Single plate 100b and the first single plate 100a are partially bonded cohesively along their mutually facing backsides, here in particular by laser welding joints along the cohesive connections 50th
- both the channels 160b and the webs 170b of the second single plate 100b and the channels 160a and the webs 170a of the first single plate 100a extend obliquely from bottom left to top right, it follows that the channels 160a and the webs 170a of the
- FIGS. 4a, 4c close the channels 160a and the webs 170a of the first single plate 100a with the channels 160b and the webs 170b of the second single plate 100b z.
- B. a crossing angle of about 50 ° or 130 °.
- portions 60b of the ridges 170b of the second single plate 100b in which a perpendicular projection of one of the channels 160a of the first single plate 100a onto the second single plate 100b crosses one of the ridges 170b of the second single plate 100b, are called crossing regions of the ridges 170b of the second single plate 100b ,
- separator plates are typically connectable only along very small contact areas in those regions in which the channels of the individual plates are crossed as described here, namely precisely where the two are facing back sides of the channel bottoms of the two individual plates intersect each other.
- the improvement proposed here consists precisely in that at least the webs 170a of the first single plate 100a are lowered in at least some of the intersection regions 60a, as shown in FIG. 4c, such that the rear side of the first single plate 100a facing the second single plate 100b is in these intersection regions 60a is in contact with the rear side of the bottom of the corresponding channel 160b of the second single plate 100b and is connected in a materially coherent manner, here z. B. by laser welding.
- the contact surfaces, along which the rear sides of the individual plates 100a, 100b in the distribution regions 150a, 150b are in contact and are connected to one another or can be connected, can thus be increased significantly.
- the webs 170a in the crossing regions 60a are each lowered over a length which corresponds approximately to twice the width of the channel crossed by the web 170a at half its height, here z. B. each over a length of about 0.4 mm.
- z. B. each over a length of about 0.4 mm.
- the positions for the web subsidence can therefore z. B. also be selected specifically to produce a desired flow profile of the medium in the distribution region 150a with the additional fluid connections between adjacent channels 160a.
- the land depressions may be targeted to compensate for or reduce any pressure differences or differences in mass transport in the channels 160a.
- the course of the integral connections 50 between the individual plates 100a, 100b is typically respectively predetermined essentially by the profile of the bottom of the respective channel 160b of the second individual plate 100b, on the rear side of which the integral connection 50 is formed .
- FIG. 4 a shows that the integral connections 50 are aligned parallel or substantially parallel to the course of the channels 160 b and the webs 170 b in the distribution region 150 b of the second individual plate 100 b.
- the alignment of the integral connections 50 may slightly differ from the direction of the bottom of the respective channel 160b, z. B. by an angle of up to 25 °, preferably at an angle of up to 10 °.
- a length of the cohesive connections 50 corresponds in the example of FIGS. 4a, 4c, in each case due to the angle of the channels 160a and 160b, which deviates greatly from 90 °, at least twice the width of the webs 170a.
- the length of the cohesive connections 50 corresponds to at least twice the width of the channels 160b traversed by the partially lowered webs 170a at half their height there.
- the cohesive compounds extend into the
- FIGS. 4a, 4c each over a length of at least 0.7 mm.
- the length of the cohesive connections 50 in FIGS. 4a, 4c each at least 10 times the width of the respective cohesive connection 50 in the region of the interface between the two individual plates 100a, 100b.
- Distribution area 150a extend within such an approximately triangular area substantially transverse to the direction of the channels in the active area 167a in order to be able to supply or remove medium to or from the entire width of the active area 167a.
- the total length of the mutually parallel channels 160a is very different, and there are often some short marginal channels or webs, such as the web 170a *. Between such marginal channels or webs lying
- the length D is 14 mm.
- Fig. 5a shows one of the in Figs. 4a, 4c shown material-cohesive connections 50, namely a welded connection between the individual plates 100a, 100b in cross section, while Fig. 5b is an alternative cohesive connection, namely an adhesive or solder joint between two individual plates 100a, 100b.
- the cutting plane is shown in Figs.
- 5a and 5b are thus selected such that the webs 170a and the channels 160a of the first single plate 100a have a minimum width along the cutting plane. Since the ridges 170b and the channels 160b of the second single plate 100b are oblique relative to the channels 160a and the ridges 170a of the first single plate 100a, the widths of the channels 160b and the ridges 170b of the second single plate 100b appear opposite to the widths of FIGS Channels 160a and the webs 170a of the first single plate 100a increases.
- the middle web 170a is lowered to the bottom of the two adjacent channels 160a.
- the rear side of the web depression 60a facing the second individual plate 100b thus lies in a plane with the adjoining back sides of the bottoms of the channels 160a extending on both sides of the middle web 170a, so that in the embodiment shown in FIGS.
- Optics depends and is usually between 30 ⁇ and 200 ⁇ , is used in adhesive or solder joints, as shown in Fig. 5b, tried to use at least 75%, preferably at least 95% of the width of the contact surface, in particular the entire width of the contact surface for the connection , Nevertheless, the advantages of the invention, especially in welded joints, as shown in the accuracy of the positioning of an instrument for forming the integral connection 50 in the crossing region 60a of Fig. 5 due to the increased contact area between the individual plates 100a, 100b are less demanding than This is the case in the known from the prior art connection of individual plates is the case. In addition, the advantages of the invention are particularly evident in the enlargement of the possible lengths of the integral connections.
- Fig. 5a two levels El and E2 are further indicated, each extending along the neutral fiber of the single plate 100a.
- the plane El corresponds to the plane in which a non-lowered web 170a extends, the plane E2 of the plane in which a channel 160a and the fully lowered portions of the web 170a extend.
- all areas of the single plate 100a, at least within their distribution area 150a, do not extend transversely to the planar surface plane of the single plate
- FIG. 6 shows a schematic plan view of an intersection region 60a of a web 170a of the first single plate 100a in a modified embodiment of the bipolar plate 100. Shown is the web depression in FIG. 6
- Image center through which a fluid connection between the both sides of the central web 170 a extending channels 160 a of the first single plate 100 a results.
- the course of a channel 160b of the second single plate 100b is shown schematically, the bottom back side facing the first single plate 100a here parallel to the xy plane and thus to the planar surface plane of the first single plate 100a at a right angle to the webs 170a and 170b the channels 160a of the first single plate 100a extends.
- the web depression 60a of the first individual plate 100a is connected to the rear side of the bottom of the channel 160b of the second individual plate 100b facing the first individual plate 100a by a material-bonding connection 50.
- connection 50 is here aligned perpendicular to the webs 170a and the channels 160a of the first single plate 100a. In this case, the connection 50 extends in the lowered crossing region 60a over the entire width of the partially lowered web 170a.
- Figures 7a-f show schematically further embodiments of webs 170a and channels 160a of the first single plate 100a and of webs 170b and channels 160b of the second single plate 100b in a schematic view.
- both the webs 170a of the first single plate 100a and the webs 170b of the second single plate 100b have a web depression in some of the regions where they are crossed by a channel of the other single plate, respectively.
- cohesive connections of the type described above are again arranged between the individual plates 100a, 100b.
- cohesive connections 50m, 50n exist between the backs of the depressions 60a of the webs 170a of the first single plate 100a and the back sides of the bottoms of the channels 160b of the second single plate 100b, as previously described in connection with FIGS. 4-6 explained.
- Figs. 7a-c also represent depressions 60b of the webs 170b of the second single plate 100b, which are connected along their rear sides to the rear sides of the bottoms of the channels 160a of the first single plate 100a via integral connections 50p to 50s.
- cohesive connections 50u, 50t are shown, which extend over at least one web drop 60a and at least one web drop 60b.
- indices m, n and p to t are used only to distinguish between the individual designs, it is always about cohesive connections 50.
- cohesive connections 50 For clarity, in the Fign. 7a-f only a part of the channels, webs, depressions and cohesive connections provided with their own reference numerals. 7a shows, with reference to two parallel groups of channels 160a, 160b, which intersect at a right angle, that several cohesive connections 50p can be formed along the rear side of the same channel, wherein the two cohesive connections 50p are spaced apart here by two webs 170b ,
- Fig. 7b shows two sets of channels 160a, 160b, in which the channels 160a, 160b widen from top to bottom in each case.
- the flocks intersect at an angle of about 65 ° or 115 °.
- the two reductions or crossing areas 60a in addition to a continuous weld
- the depressions or crossing regions 60b have two further welded joints 50r and 50s which differ from the welded joints 50q in that they lie in a region. in which two adjacent webs 170b are lowered, so that they are in immediate effect relationship.
- the webs 170a and the channels 160a of the first single plate 100a and the webs 170b and the channels 160b of the second single plate 100b may be curved, for example, circular arc (FIG. 7c) or wavy (FIG. 7d).
- Figures 7e and 7f illustrate more complex subsidence and connection patterns by means of a rectangular grid of intersecting sets of channels 160a, 160b of constant channel width, these complex patterns not being limited to rectangular arrays of channels of constant width.
- the complex subsidence and connection patterns can be used primarily to guide media targeted through the channels.
- two mutually adjacent webs 170b are each lowered relative to the same channel 160a to form the depressions 60b.
- the two webs 170a delimiting this channel 160a are in turn lowered in the area between the two adjacent webs 170b, which are lowered in sections, forming the depressions 60a.
- the contact surfaces The back surfaces of the channels 160a, 160b together with the contact surfaces of the backs of the recesses 60a and the back of the bottom of the channel 160b and the contact surfaces of the backs of the recesses 60b and the back of the bottom of the channel 160a form a large contact surface of the two individual plates 100a, 100b, which allows a cross-shaped cohesive connection 50t of the two individual plates 100a, 100b.
- FIG. 7f shows an angled connection 50u of the two individual plates 100a, 100b, which extends over three web lowering or crossing regions 60b, 60a and 60b.
- a web 170b of the second single plate 100b is lowered in the area opposite a channel 160a of the first single plate 100a and thus fluidly connects two channels 160b of the second single plate 100b.
- a web 170a of the first single plate 100a is again lowered adjacent to the countersink 60b of the web 170b.
- This reduction 60a fluidly connects two channels 160a of the first single plate 100a.
- a web 170b of the second single plate 100b is again lowered.
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Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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US15/752,634 US10868313B2 (en) | 2015-08-14 | 2016-08-09 | Separator plate for an electrochemical system |
JP2018506316A JP6759515B2 (ja) | 2015-08-14 | 2016-08-09 | 電気化学システム用セパレータプレート |
DE112016003712.0T DE112016003712A5 (de) | 2015-08-14 | 2016-08-09 | Separatorplatte für ein elektrochemisches System |
CN201680047310.6A CN107925096B (zh) | 2015-08-14 | 2016-08-09 | 用于电化学系统的分离器板 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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DE202015104300.7U DE202015104300U1 (de) | 2015-08-14 | 2015-08-14 | Separatorplatte für ein elektrochemisches System |
DE202015104300.7 | 2015-08-14 |
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WO2017029158A1 true WO2017029158A1 (de) | 2017-02-23 |
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PCT/EP2016/068956 WO2017029158A1 (de) | 2015-08-14 | 2016-08-09 | Separatorplatte für ein elektrochemisches system |
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US (1) | US10868313B2 (de) |
JP (1) | JP6759515B2 (de) |
CN (1) | CN107925096B (de) |
DE (2) | DE202015104300U1 (de) |
WO (1) | WO2017029158A1 (de) |
Cited By (1)
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DE102023207721A1 (de) | 2022-08-10 | 2024-02-15 | Reinz-Dichtungs-Gmbh | Separatorplatte für ein elektrochemisches System |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
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DE202016107302U1 (de) * | 2016-12-22 | 2018-03-27 | Reinz-Dichtungs-Gmbh | Separatorplatte für ein elektrochemisches System |
DE202018103058U1 (de) | 2018-05-30 | 2019-09-02 | Reinz-Dichtungs-Gmbh | Separatorplatte für ein elektrochemisches System |
NL2022354B1 (en) * | 2019-01-08 | 2020-08-13 | Hyet Holding B V | Flow field plate and compressor comprising such plate |
DE202019101145U1 (de) * | 2019-02-28 | 2020-05-29 | Reinz-Dichtungs-Gmbh | Separatorplatte für ein elektrochemisches System |
JP7238761B2 (ja) * | 2019-12-25 | 2023-03-14 | トヨタ自動車株式会社 | 燃料電池 |
DE102021108876B4 (de) | 2021-04-09 | 2023-10-19 | Schaeffler Technologies AG & Co. KG | Elektrochemisches System |
DE102021213135A1 (de) * | 2021-11-23 | 2023-05-25 | Robert Bosch Gesellschaft mit beschränkter Haftung | Bipolarplatte für eine Brennstoffzelleneinheit |
DE202021106642U1 (de) | 2021-12-06 | 2023-03-08 | Reinz-Dichtungs-Gmbh | Separatorplatte mit Schweißabschnitten |
DE102022112175B3 (de) * | 2022-05-16 | 2023-05-17 | Bender GmbH Maschinenbau- u. Streckmetallfabrik | Plattenanordnung für eine elektrochemische Zelle |
DE102022206952A1 (de) | 2022-07-07 | 2024-01-18 | Robert Bosch Gesellschaft mit beschränkter Haftung | Bipolarplatte, Brennstoffzellensystem und Elektrolyseur |
DE202022104571U1 (de) | 2022-08-11 | 2023-11-16 | Reinz-Dichtungs-Gmbh | Separatorplatte mit ineinander verschachtelten Einzelplatten |
DE102022129159B3 (de) | 2022-11-04 | 2023-11-02 | Schaeffler Technologies AG & Co. KG | Bipolarplatte, Zellenstapel und Verfahren zur Herstellung einer Bipolarplatte |
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FR2997561A1 (fr) * | 2012-10-30 | 2014-05-02 | Michelin & Cie | Plaque bipolaire pour pile a combustible |
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US7781122B2 (en) * | 2004-01-09 | 2010-08-24 | Gm Global Technology Operations, Inc. | Bipolar plate with cross-linked channels |
US7951507B2 (en) * | 2004-08-26 | 2011-05-31 | GM Global Technology Operations LLC | Fluid flow path for stamped bipolar plate |
DE102005020332B4 (de) * | 2005-04-26 | 2012-02-02 | Reinz-Dichtungs-Gmbh | Verfahren zum Herstellen einer Versorgungsplatte für elektrochemische Systeme, Versorgungsplatte und deren Verwendung |
DE102013210544A1 (de) * | 2013-06-06 | 2014-12-11 | Volkswagen Ag | Bipolarplatte und Brennstoffzelle mit einer solchen |
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2015
- 2015-08-14 DE DE202015104300.7U patent/DE202015104300U1/de active Active
-
2016
- 2016-08-09 JP JP2018506316A patent/JP6759515B2/ja active Active
- 2016-08-09 US US15/752,634 patent/US10868313B2/en active Active
- 2016-08-09 DE DE112016003712.0T patent/DE112016003712A5/de active Pending
- 2016-08-09 WO PCT/EP2016/068956 patent/WO2017029158A1/de active Application Filing
- 2016-08-09 CN CN201680047310.6A patent/CN107925096B/zh active Active
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US4983472A (en) * | 1989-11-24 | 1991-01-08 | International Fuel Cells Corporation | Fuel cell current collector |
US20090162733A1 (en) * | 2007-12-21 | 2009-06-25 | Iverson Eric J | Flow field plate for a fuel cell with features to enhance reactant gas distribution |
FR2997561A1 (fr) * | 2012-10-30 | 2014-05-02 | Michelin & Cie | Plaque bipolaire pour pile a combustible |
FR2997562A1 (fr) * | 2012-10-30 | 2014-05-02 | Michelin & Cie | Plaque bipolaire pour pile a combustible |
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DE102023207721A1 (de) | 2022-08-10 | 2024-02-15 | Reinz-Dichtungs-Gmbh | Separatorplatte für ein elektrochemisches System |
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Publication number | Publication date |
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US10868313B2 (en) | 2020-12-15 |
DE112016003712A5 (de) | 2018-05-17 |
CN107925096A (zh) | 2018-04-17 |
JP2018529184A (ja) | 2018-10-04 |
DE202015104300U1 (de) | 2016-08-19 |
US20180241049A1 (en) | 2018-08-23 |
CN107925096B (zh) | 2022-02-11 |
JP6759515B2 (ja) | 2020-09-23 |
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