WO2022253384A1 - Plaque bipolaire et procédé pour faire fonctionner un système de pile à combustible - Google Patents

Plaque bipolaire et procédé pour faire fonctionner un système de pile à combustible Download PDF

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Publication number
WO2022253384A1
WO2022253384A1 PCT/DE2022/100398 DE2022100398W WO2022253384A1 WO 2022253384 A1 WO2022253384 A1 WO 2022253384A1 DE 2022100398 W DE2022100398 W DE 2022100398W WO 2022253384 A1 WO2022253384 A1 WO 2022253384A1
Authority
WO
WIPO (PCT)
Prior art keywords
field
bipolar plate
port
distribution
coolant
Prior art date
Application number
PCT/DE2022/100398
Other languages
German (de)
English (en)
Inventor
Sebastian Zwahr
Original Assignee
Schaeffler Technologies AG & Co. KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from DE102022112931.4A external-priority patent/DE102022112931A1/de
Application filed by Schaeffler Technologies AG & Co. KG filed Critical Schaeffler Technologies AG & Co. KG
Publication of WO2022253384A1 publication Critical patent/WO2022253384A1/fr

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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
    • H01M8/0267—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
    • H01M8/02—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
    • 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
    • H01M8/0202—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
    • H01M8/0265—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant the reactant or coolant channels having varying cross sections

Definitions

  • the invention relates to a bipolar plate provided for use in a fuel cell system. Furthermore, the invention relates to a method for operating a fuel cell system.
  • a bipolar plate of a fuel cell system is described, for example, in US Pat. No. 10,230,117 B2.
  • An open anode gas flow field and an open cathode gas flow field are formed by this bipolar plate, with a closed coolant flow field being present at the same time.
  • So-called inactive supply areas establish the connections between the total of six main channels and the various flow fields and are structured in the form of channels, with the various fluid flows crossing in a plan view of the bipolar plate.
  • a fuel battery disclosed in DE 35 26 614 A1 comprises a total of three distribution networks, also referred to as distribution circuits, namely one distribution network each for a fuel, an oxygen carrier and an electrolyte.
  • the fuel battery has a plurality of stacked plastic frames and a multiplicity of plate-shaped current collectors, through which groove-shaped structures for the passage of media are formed.
  • the invention is based on the object of further developing fuel points compared to the state of the art mentioned, with a particularly favorable relationship between the uniformity of fluid distributions and pressure losses occurring being sought.
  • bipolar plate having the features of claim 1.
  • the object is also achieved by a method for operating a fuel cell system according to claim 9.
  • the configurations and advantages of the invention explained below in connection with the operating method apply accordingly also for the devices designed to carry out this method, ie the bipolar plate and a fuel cell system comprising several such bipolar plates.
  • the bipolar plate is formed from two superimposed, rectangular, embossed half-sheets that are firmly connected to one another and has three ports arranged next to one another in a fluid inflow area on one narrow side of the half-sheets, namely a hydrogen port, a coolant port and an air port, with the Coolant port is arranged between the hydrogen port and the air port.
  • the hydrogen port can alternatively also be supplied with a fuel gas other than hydrogen.
  • the air port can also be supplied with pure oxygen instead of air.
  • An active field on the anode side is formed by one of the half sheets, while an active field on the cathode side is formed by the other half sheet.
  • the coolant is routed from the coolant port between the two half sheets and flows through the bipolar plate between them.
  • the fuel gas here hydrogen in particular, is routed from the hydrogen port to the anode side, while air or oxygen is routed from the air port to the cathode side. Accordingly, the fuel gas and the Air or the oxygen passed separately through the two half-sheets. Structures for distributing the fluids, ie hydrogen, coolant and air, are formed between the ports and the respective active area.
  • the sheet metal used has a sheet thickness of less than 1 mm, in particular in the range from 50 to 200 ⁇ m, particularly preferably 100 ⁇ m.
  • first distributor field which is designed as a collector for the respective fluid, which extends and extends in its width starting from the coolant port in the direction of the active field beyond this middle of the three ports to the two outer ports , wherein the first distributor field is formed by flat areas of the half-plates, for a non-directed flow of the respective fluid permitting cross-flows.
  • first distributor field is formed by flat areas of the half-plates, for a non-directed flow of the respective fluid permitting cross-flows.
  • one side adjoining the coolant port and one side of the first distributor field adjoining the second distributor field run parallel to each other.
  • a second distributor field is present, which is structured in the form of channels comprising linear channels, the linear channels extending from the first distributor field in the direction of the active field with different channel widths.
  • the linear channels therefore do not have identical channel widths.
  • the middle linear channels on the coolant side of the second distribution field, as seen in the plan view of the bipolar plate have about 5 to 40% of the width of the linear channels in the edge area of the second distribution field.
  • the channels in the edge area are therefore wider than in the central area.
  • the linear channels for fuel gas and air preferably have 20 to 50% of the channel width of the central linear channels of the second distribution panel in the top view of the respective side of the bipolar plate in the edge region of the second distribution panel.
  • the change in the channel widths in the second patch panel from the center to the edge does not have to change linearly here, it preferably changes in an exponential manner.
  • a third distribution panel designed as a further collector corresponding to the first distribution panel is present, which adjoins the second distribution panel and the active panel, with a width of the third distribution panel corresponding to a width of the active panel, and with the third distribution panel having further flat areas of the half sheets is designed for a non-directional Strö determination of the respective fluid, permitting a cross-flow.
  • a “collector” is understood to be a fluid volume without flow-guiding geometric features.
  • this volume there is not necessarily a straight-line flow from the inflow to the outflow area, but transverse flows can occur which bring about a mass flow distribution that is uniform over the width of the outflow geometry. This equalizing effect occurs in particular when the pressure loss through the collector is at least 5 times smaller than that of the active field.
  • the inflow or outflow arrangement for the various fluids formed from all three ports arranged next to one another is preferably wider overall than the first distributor field in a plan view of the bipolar plate.
  • the inflow and/or outflow arrangement for the fluids is located on or in each case on a narrow side of the rectangular bipolar plate.
  • the main flow direction of the fluids corresponds to the longitudinal direction of the bipolar plate.
  • the hydrogen port and the air port are each preferably formed in the shape of a rectangular trapezoidal opening, and the coolant port is preferably formed in the shape of a rectangular opening.
  • the invention is based on the consideration that when fluids flow through fuel cells, the most ideal uniformity possible in the fluid distribution on the one hand and a low pressure loss in the fluids on the other hand represents a conflict of objectives.
  • channel-guided distributors for fluids are suitable for operation with low pressure loss, since practically the entire cell height of the fuel cell is available for each individual channel.
  • directing fluids through individual channels can lead to uneven distribution of the fluid.
  • Another conceivable approach to distributing fluid is to use a larger, non-structured, flat surface as the distribution field. In this case, several such distributor fields must be stacked on top of each other within the given low cell height, which can pose a challenge in terms of mechanical stability on the one hand and entails high pressure losses on the other.
  • the conflict of objectives described is solved or at least mitigated by the fact that different types of distribution panels are alternately connected in series. Surprisingly, it has been shown that not only can a uniform fluid distribution be achieved in this way, but that the entire structures for fluid distribution can also be integrated into the bipolar plate with an acceptable space requirement.
  • a fuel cell system can generally be operated by using three fluids, some of which are gaseous and some of which are liquid, viz Hydrogen, coolant and air are routed from three ports arranged side by side to an active field of the bipolar plate.
  • the various fluids are routed to the active field in that the fluids first flow through the first distribution field, then through the second distribution field, which in contrast to the first distribution field is structured in the form of a channel, and from the second distribution field into the third, on the active field Adjoining, designed as a collector distributor field reach, the width of which corresponds to the width of the active field.
  • Adjoining designed as a collector distributor field reach, the width of which corresponds to the width of the active field.
  • the spaces in which the various fluids are located are stacked one on top of the other according to the position of the bipolar plates, so that the layers in which the fluids are located define planes that are parallel to one another and to the bipolar plates. This can be formed within the first and the third distributor field layered collection spaces for the different fluids, which extend over the entire width of the respective distributor field.
  • the collection space for coolant takes up to 40% of the height of the installation space, the collection space for hydrogen 15 to 35% of the height of the installation space and the collection space for air 40 to 60% of the height height of the construction space.
  • the height of the installation space extends between two membrane-electrode units, which cover the cathode side and anode side of the bipolar plate when installed in a fuel cell stack.
  • the linear channel structure which is given in the second distributor field, means that in this case channels are arranged next to one another, resulting in a strip-shaped structure in a plan view of the bipolar plate.
  • the fluid routing can advantageously be designed in such a way that the two gaseous fluids, i.e. air and hydrogen, starting from the respective port, in a plan view of one of the two sides of the bipolar plate having the active field, initially within the first distribution field without a flow line within this Distribution panel cross-shaped (separated from each other on the respective side of the bipolar plate) to flow towards one another, in order to then be erfeld fanned out by the second distribution panel, while the coolant flows between the half-sheets occupies a continuously widening space both in the first and in the second distributor.
  • the two gaseous fluids i.e. air and hydrogen
  • the coolant port has a rectangular basic shape, whereas the hydrogen port and the air port can be shaped asymmetrically and are preferably not of the same size.
  • the hydrogen port occupies a smaller area than the air port.
  • the first distribution panel which is unstructured in a plan view of the bipolar plate, has a shape that widens from the central port in the direction of the active panel. With this configuration, uniform, short distances between the ports and the first distributor field can be realized if the hydrogen port and the air port are each designed in the form of a rectangular-trapezoidal opening.
  • the second distributor field preferably comprises at least eight and in particular at most 64 parallel-connected linear coolant channels, with two channels for the gaseous fluids being formed between two coolant channels, separated from one another by the half-plates, and the resulting linear channel structure of the second distributor field, which can be seen in a plan view of the half-plates is less finely structured than the channel structure of the active field.
  • the second patch panel has a trapezoidal shape that widens from the first patch panel in the direction of the third patch panel.
  • the channel width of the linear channels in the second distributor field preferably increases from the inside to the outside, ie towards the longitudinal sides of the bipolar plate and thus towards the edges of the fan-shaped, structured distributor field. Furthermore, the channel width of an individual linear channel in the second distributor field can steadily increase, starting from the first distributor field, which is due to the widening trapezoidal shape of the second distributor field.
  • the third distribution panel can describe a narrow rectangular shape aligned in the transverse direction of the bipolar plate in a plan view of the half-plates, whereby measured in the direction of flow of the fluids it can be narrower than the first distribution panel, in particular at most half as wide as the first distribution panel.
  • the equalization of the liquid and gas flows has already taken place for the most part when the fluids exit the second distributor field. A final, fine distribution of the fluids takes place within the third distributor field.
  • the second distribution field is, according to various possible configurations, the widest of the three distribution fields connected in series, measured in the direction of flow of the fluids, with the sum of the width of the first distribution field and the width of the third distribution field deviates from the width of the second patch panel, for example, by no more than 25% up or down.
  • Fig. 2 shows a detail of the bipolar plate in a sectional view A-A
  • Fig. 4 shows a further detail of the bipolar plate in a sectional view C-C
  • Fig. 5 shows a further detail of the bipolar plate in a sectional view D-D.
  • a total of identified by the reference numeral 1 bipolar plate is provided for use in a fuel cell system not shown.
  • This can be a stationary or a mobile system, in particular in a motor vehicle.
  • a plurality of fuel cells is assembled into a fuel cell stack.
  • the bipolar plate 1 is made up of two rectangular half-sheets 2, 3 (compare FIGS. 2 to 5) which are firmly connected to one another.
  • a half-cell 4 of a fuel cell is separated from a half-cell 5 of another fuel cell by each bipolar plate 1 of the fuel cell stack. Coolant flows between the two half-sheets 2 , 3 of one and the same bipolar plate 1 , which flows in through a coolant port 6 and flows out through a further coolant port (not shown) at the other end of the bipolar plate 1 .
  • a hydrogen port 7 and an air port 8 are formed through the bipolar plate 1 .
  • the three ports 7 , 6 , 8 are arranged next to one another on a narrow side of the bipolar plate 1 .
  • the coolant port 6 has a rectangular cross section.
  • the ports 7, 8, through which gases are to flow are also square, but with a wedge-shaped beveled cross-section or in the form of a rectangular trapezium. Each of the rectangular trapezoids points with its sloping edge to the first patch panel 10.
  • transition areas 9 Between all ports 6, 7, 8 and a first distributor field 10 there are transition areas 9, each of which has a strip shape of uniform width, with seals 21 being arranged in the transition areas 9 in such a way that only the intended fluid can flow through.
  • the seal 21 also surrounds each of the ports 6, 7, 8.
  • the transitional areas 9 between the ports 7, 8 and the first distribution panel 10 are opposite the transitional area 9 between the coolant port 6 and the first distribution panel 10 by one angle of 45° ⁇ 15°.
  • the transition areas 9 thus border on three sides of the first distributor panel 10, which describes a modified trapezoidal shape.
  • the modification compared to a geometrically perfect trapezoid is due to the fact that the air port 8 is significantly larger than the hydrogen port 7.
  • the first patch panel 10 has a pentagonal shape, extending from the ports 6, 7, 8 towards one of the first Distribution panel 10 immediately subsequent second distribution panel 11 V-shaped alswei switched.
  • FIG. 2 shows the section AA through the bipolar plate 1 according to FIG. 1 in the area of the coolant port 6. It can be seen that in the area of the first distributor panel 10 the metal sheets 2, 3 run flat and parallel to one another. Boundaries of the half-cells 4, 5 are indicated by dashed lines.
  • the second distribution panel 11 in FIG. 1 also shows a V-shaped widening starting from the first distribution panel 10 in the direction of the third distribution panel 12, which is less pronounced than in the first distribution panel 10, however.
  • the third distribution panel 12 directly adjoins the second distribution panel 11, which, in contrast to the distribution panels 10, 11, has the shape of a narrow rectangle.
  • the third distributor field 12 borders on the structured active field of the bipolar plate 1, which is denoted by 13.
  • the two half-plates 2, 3 each have an anode-side and a cathode-side active field 13.
  • Each active field has a designated 14 channel structure.
  • FIG. 4 schematically shows a section CC through the channel structure of the second distribution panel 11 .
  • a similar, strip-like structured form is also given in the active field 13.
  • 15 denotes a coolant passage, 16 an air passage, and 17 a hydrogen passage. Boundaries of the half-cells 4, 5 are indicated by dashed lines.
  • the height of the coolant channel 15 to be measured in the normal direction of the planes in which the half-plates 2, 3 lie corresponds approximately to the height of two half-cells 4, 5, ie one fuel cell.
  • the coolant channels 15 have a hexagonal cross section, which also determines the cross sections of the channels 16, 17, which lie between adjacent coolant channels.
  • the Half-sheets 2, 3 in the area of the channels 16, 17 lie directly one on top of the other, so that the individual coolant channels 15 are separated from one another in the transverse direction.
  • the fluid streams flowing into the second distributor field 11 are already partially evened out by the first distributor field 10, which, in contrast to the second, channel-like structured distributor field 11, is designed as a collector.
  • the structure of the collector 10 is shown in FIG. 3, which shows a section B-B through the bipolar plate 1.
  • FIG. After that, in the area of the collector or the first distributor field 10, there is a layered flow of the various liquids and gases one above the other.
  • a coolant collector 19 forms GE, which is sandwiched between an air collector 18 and a water collector 20 is located.
  • the collecting chambers 18, 19, 20, such as the air collector 18, the coolant collector 19 and the hydrogen collector 20 for linguistic differentiation from the collectors of the first distributor field 10 and the third distributor field 12 are collectively called, extend over the entire width of the first distributor field 10, that is, of the first collector.
  • the structure of the third distribution field 12, i.e. the second collector, is shown in section DD according to Figure 5 and essentially corresponds to the structure of the first collector or first distribution field 10.
  • the various media that leave the second distribution field 11 ha ben, finely distributed, the height of the individual collecting spaces 18a, 19a, 20a, ie the coolant collector 19a, the air collector 18a and the hydrogen collector 20a, are designed within the second collector depending on the desired pressure and flow conditions.
  • the distributor fields 10, 11, 12, which are alternately unstructured and structured like channels create good conditions for uniform generation of electrical power and thermal stress within the active field 13.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Fuel Cell (AREA)

Abstract

L'invention concerne une plaque bipolaire (1) pour un système de pile à combustible, laquelle comporte deux demi-tôles (2, 3) estampées rectangulaires superposées et présente sur un petit côté des demi-tôles (2, 3) trois orifices (6, 7, 8) disposés les uns à côté des autres dans une zone d'entrée de fluide, à savoir un orifice pour hydrogène (7), un orifice pour fluide de refroidissement (6) et un orifice pour air (8), l'orifice pour fluide de refroidissement (6) étant agencé entre l'orifice pour hydrogène (7) et l'orifice pour air (8), ainsi qu'un champ actif (13) côté anode formé par une des demi-tôles (2, 3) et un champ actif (13) côté cathode formé par l'autre demi-tôle (3, 2), des structures de répartition des fluides, c'est-à-dire de l'hydrogène, du liquide de refroidissement et de l'air, étant formées entre les orifices (6, 7, 8) et la surface active (13), lesdites structures comprenant les parties (10, 11, 12) suivantes à partir des orifices (6, 7, 8), en direction du champ actif (13) : un premier champ de répartition (10) qui est conçu comme collecteur pour le fluide respectif et qui s'étend en largeur, de l'orifice pour fluide de refroidissement (6) en direction du champ actif (13), au-delà de l'orifice central (6) de ces trois orifices jusqu'aux deux orifices extérieurs (7, 8), un deuxième champ de répartition (11) structuré en forme de canal et un troisième champ de répartition (12) conçu comme collecteur de manière correspondante au premier champ de répartition (10), lequel troisième champ de répartition jouxte le champ actif (13).
PCT/DE2022/100398 2021-06-01 2022-05-25 Plaque bipolaire et procédé pour faire fonctionner un système de pile à combustible WO2022253384A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE102021114102 2021-06-01
DE102021114102.8 2021-06-01
DE102022112931.4 2022-05-23
DE102022112931.4A DE102022112931A1 (de) 2021-06-01 2022-05-23 Bipolarplatte und Verfahren zum Betrieb eines Brennstoffzellensystems

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WO2022253384A1 true WO2022253384A1 (fr) 2022-12-08

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102628206B1 (ko) * 2023-06-08 2024-01-23 주식회사 씨엔엘에너지 수전해 분리판 및 이를 포함하는 수전해 셀

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3526614A1 (de) 1984-07-27 1986-01-30 Occidental Chemical Corp., Niagara Falls, N.Y. Brennstoffbatterie
JP2003317793A (ja) * 2002-04-23 2003-11-07 Hitachi Ltd 固体高分子型燃料電池及びそれを用いた発電システム
JP2006032008A (ja) * 2004-07-13 2006-02-02 Nissan Motor Co Ltd 燃料電池
WO2006054399A1 (fr) * 2004-11-17 2006-05-26 Nissan Motor Co., Ltd. Separateur de piles a combustible
US20080070080A1 (en) * 2004-12-16 2008-03-20 Nissan Motor Co., Ltd. Fuel Cell Separator
US20110165500A1 (en) * 2010-05-11 2011-07-07 Ford Global Technologies, Llc. Fuel cell stack that promotes generally uniform flow therein
US8911917B2 (en) 2010-11-22 2014-12-16 Honda Motor Co., Ltd. Fuel cell
US10230117B2 (en) 2013-06-06 2019-03-12 Volkswagen Ag Bipolar plate, fuel cell having such a plate and motor vehicle having such a fuel cell
CN111430746A (zh) * 2020-04-28 2020-07-17 上海亿氢科技有限公司 一种氢燃料电池膜电极发电性能测试用双极板

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3526614A1 (de) 1984-07-27 1986-01-30 Occidental Chemical Corp., Niagara Falls, N.Y. Brennstoffbatterie
JP2003317793A (ja) * 2002-04-23 2003-11-07 Hitachi Ltd 固体高分子型燃料電池及びそれを用いた発電システム
JP2006032008A (ja) * 2004-07-13 2006-02-02 Nissan Motor Co Ltd 燃料電池
WO2006054399A1 (fr) * 2004-11-17 2006-05-26 Nissan Motor Co., Ltd. Separateur de piles a combustible
US20080070080A1 (en) * 2004-12-16 2008-03-20 Nissan Motor Co., Ltd. Fuel Cell Separator
US20110165500A1 (en) * 2010-05-11 2011-07-07 Ford Global Technologies, Llc. Fuel cell stack that promotes generally uniform flow therein
US8911917B2 (en) 2010-11-22 2014-12-16 Honda Motor Co., Ltd. Fuel cell
US10230117B2 (en) 2013-06-06 2019-03-12 Volkswagen Ag Bipolar plate, fuel cell having such a plate and motor vehicle having such a fuel cell
CN111430746A (zh) * 2020-04-28 2020-07-17 上海亿氢科技有限公司 一种氢燃料电池膜电极发电性能测试用双极板

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102628206B1 (ko) * 2023-06-08 2024-01-23 주식회사 씨엔엘에너지 수전해 분리판 및 이를 포함하는 수전해 셀

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