4292results about "Collectors/separators" patented technology

The invention relates to the production of a plate arrangement (2) of a stack (1) of electrochemical cells (3), wherein plates arranged parallel to one another are additively produced in planes which are oriented perpendicular to the plates. The invention further relates to an electrochemical cell (3), in particular an electrochemical system in the form of an electrolyzer, with a cell stack (1) comprising two end plates (28, 29), between which at least one such plate arrangement (2) and at least two polymer electrolyte membranes (34, 34') are arranged.

The invention belongs to the technical field of bipolar membranes, and particularly relates to a bipolar membrane containing a hydroxyl MOF catalyst middle layer and a preparation method and application of the bipolar membrane. The high-performance and high-stability heterogeneous bipolar membrane is prepared by taking anion and cation exchange resin as an exchange group of the bipolar membrane, adding an adhesive and taking an MOF material containing a hydroxyl group as a water dissociation catalyst. The raw materials are low in cost and wide in source and have excellent ion exchange capacity, and the prepared bipolar membrane is better in performance and simple in manufacturing process. The hydroxyl MOF water dissociation catalyst simultaneously contains a hydroxyl group and a metal group, so that the specific surface area of the catalyst can be effectively prolonged, transfer of protons from water molecules to fixed charge groups is enhanced, and water dissociation in a bipolar membrane is accelerated. By adding the adhesive and the carbon-containing woven fabric fibers, the stability of the membrane structure is enhanced, the service life of the membrane is prolonged, and the mechanical property and the conductivity of the bipolar membrane are effectively improved.

The present disclosure relates to a field of a fuel cell test, and in particular, to a method and an apparatus for optimizing design based on performance evaluation of a gas diffusion layer of a fuel cell. The method includes: determining an overall porosity of the gas diffusion layer of the fuel cell according to production requirements, and obtaining a plurality of porosity structures with the overall porosity; obtaining performance evaluation indexes of the gas diffusion layer of the fuel cell, and constructing a performance evaluation system for the gas diffusion layer of the fuel cell; calculating, with reference to evaluation functions and index weight ratios, performance comprehensive scores of the plurality of porosity structures in the performance evaluation system of the gas diffusion layer of the fuel cell; determining an optimal design scheme in the plurality of porosity structures according to the performance comprehensive scores.

The invention belongs to the field of titanium alloys and fuel cells, and discloses a corrosion-resistant titanium alloy bipolar plate which comprises niobium, zirconium and tantalum elements, the corrosion-resistant titanium alloy bipolar plate comprises the following components in percentage by mass: 14-18% of niobium, 8-12% of zirconium, 3-7% of tantalum and the balance of titanium and inevitable impurities, and the titanium alloy bipolar plate is good in corrosion resistance in a highly corrosive environment, so that a fuel cell can stably operate under severe conditions, and the service life of the fuel cell is prolonged. In addition, the invention further discloses a preparation method of the corrosion-resistant titanium alloy bipolar plate, alloy raw materials are subjected to hot rolling, annealing, cold rolling and heat treatment after being cast, and therefore a titanium alloy thin plate which is uniform in structure, smooth in surface, free of defects and 1 mm in thickness can be rolled.

The invention relates to the field of water electrolysis hydrogen production, and discloses a bipolar plate, a PEM electrolytic bath, a PEM fuel cell and a new energy vehicle, the bipolar plate comprises a bipolar plate body, and the bipolar plate body is provided with a water inlet channel, a water outlet channel and a first reaction tank; the first reaction tank is formed on the anode side surface of the bipolar plate body and is sequentially divided into a water inlet distribution area, an anode reaction area and a water outlet confluence area along the length direction of the bipolar plate body, the water inlet channel is communicated with the water inlet distribution area, the water outlet channel is communicated with the water outlet confluence area, and the water inlet channel and the water outlet channel are staggered in the length direction of the bipolar plate body; the water inlet distribution area is provided with a shunting direct connection section which is aligned and communicated with the water inlet channel and a shunting dislocation section which is staggered with the water inlet channel in the length direction of the bipolar plate body, a first shunting flow channel is formed in the shunting direct connection section, a second shunting flow channel is formed in the shunting dislocation section, and the circulation resistance of the first shunting flow channel is greater than that of the second shunting flow channel. The bipolar plate provided by the invention has good electrolytic efficiency and performance.

The present disclosure relates to fuel cells comprising composite catalytic material comprising (N-doped) carbon nanofoam, catalytic metal and an electrically conductive material comprising an electrically conductive polymer. The fuel cells can advantageously operate at lower temperatures than standard fuel cells.

The present invention relates to a composite high-temperature proton exchange membrane, a preparation method thereof, and an application thereof. The preparation method of the composite high-temperature proton exchange membrane comprises the following steps: S1. Mix a polymer represented by formula (I), a polymer represented by formula (II), and a solvent to obtain a casting solution, pour it, and dry it to obtain a composite film; S2. Immerse the composite film obtained in step S1 in an alkaline solution of borax, wash it, dry it, and then adsorb phosphoric acid to obtain the composite high-temperature proton exchange membrane. The composite high-temperature proton exchange membrane prepared by the preparation method of the present invention still maintains good proton conductivity / has high proton conductivity, has a high peak power density, and has high tensile strength and high phosphoric acid retention rate under the condition of low phosphoric acid adsorption amount.

The invention discloses an elliptical wave-shaped runner structure of a solid oxide fuel cell and an optimization method of the elliptical wave-shaped runner structure, the runner structure comprises a cathode connecting piece, a single cell and an anode connecting piece which are sequentially arranged from top to bottom, the cathode connecting piece is connected with the single cell to form a cathode runner, and the anode connecting piece is connected with the single cell to form an anode runner; the anode connecting piece is connected with the single battery to form an anode flow channel; projections of the cathode flow channels and the anode flow channels on the surfaces of the single cells are rectangular; and the surfaces of one sides, far away from the single cells, of the cathode flow channels and the surfaces of one sides, far away from the single cells, of the anode flow channels are wavy concave-convex curved surfaces. The flow channel structure disclosed by the invention can reduce the pressure drop of the flow channel, improve the non-uniform distribution of gas in the flow channel, improve the mass transfer efficiency, promote heat exchange and improve the performance of the battery.

The invention provides an SOFC (solid oxide fuel cell) stack and a method for converting methane into low-carbon hydrocarbon and generating electric energy, the SOFC stack comprises a plurality of stack basic units, each cell stack basic unit comprises an electrolyte, a cathode and an anode which are arranged on two sides of the electrolyte, a cathode current collecting layer and an anode current collecting layer which are respectively arranged on the cathode and the anode, and a current collecting connector for connecting the cathode and the anode of the adjacent cell stack basic unit; wherein the collector connector is made of martensitic stainless steel, and chemical modification layers are arranged on the cathode side and the anode side of the collector connector; and a methane oxidative coupling catalyst is loaded on the chemical modification layer on the anode side of the current collecting connector. According to the invention, the chemical modification layer is formed on the surface of the collector connector made of martensitic stainless steel, and the methane oxidative coupling catalyst is loaded on the chemical modification layer on the anode side of the collector connector, so that the formation of carbon deposition on the surface is effectively inhibited, and the yield of low-carbon hydrocarbon products generated by methane conversion is improved.

The invention discloses a bipolar plate structure for realizing a flow field distribution area and a PEM fuel cell. The provided polar plate comprises a hydrogen flow field, an air flow field and a cooling water flow field, flow field distribution areas are arranged in inlet and outlet areas of the flow fields, and a flow path of fluid under structural intervention of the flow field distribution areas is formed. A bipolar plate flow field air inlet distribution area is divided into three parts, namely an air inlet area, a transition area and a distribution area. The air inlet area flow channel is perpendicular to the edge of the large channel, the length of the flow channel is gradually increased, and the transition area flow channel is parallel to the adjacent sealing groove inner groove. A one-to-multiple flow channel is arranged in the distribution area, and the ridge of the one-to-multiple flow channel is regularly arranged. And the ridge width in the hydrogen / air electrochemical active region is designed to be greater than the width of the flow channel. The bipolar plate distribution area design provided by the invention can solve the problem of local hot spots caused by non-uniform gas distribution, realizes maximization of the area utilization rate of the polar plate, prevents the plate from being damaged due to long-term stress concentration, and prolongs the service life of the fuel cell.

The invention discloses a hydrogen fuel cell stack which comprises a pair of end plates, a plurality of cell units are stacked between the pair of end plates, each cell unit comprises a cathode plate and an anode plate, each end plate is provided with an end plate connecting hole, the cathode plate in each cell unit is provided with a cathode plate connecting hole, and the anode plate in each cell unit is provided with a cathode plate connecting hole. The anode plate in each battery unit is provided with an anode plate connecting hole, the end plate connecting hole corresponds to the cathode plate connecting hole of each cathode plate and the anode plate connecting hole of each anode plate, and the end plates and all the battery units are fixed through the end plate connecting holes, the cathode plate connecting holes and the anode plate connecting holes; an air flow field capable of spirally conveying air from inside to outside is arranged on the plate surface of each negative plate; and a hydrogen flow field capable of spirally conveying hydrogen from outside to inside is arranged on the plate surface of each anode plate. The method has the advantage that the condition that the middle of the polar plate is expanded and bulged due to uneven heating in the working process of the electric pile can be effectively prevented.

The invention provides ferritic stainless steel for a fuel cell bipolar plate and a preparation method of the ferritic stainless steel, and relates to the technical field of ferritic stainless steel. The thickness of the ferritic stainless steel for the fuel cell bipolar plate is 0.02-0.3 mm, and the ferritic stainless steel comprises the following components in percentage by mass: less than or equal to 0.01% of C, less than 0.005% of N, 0.15-0.30% of Si, 0.10-0.40% of Mn, 20-40% of Cr, less than 0.005% of P, less than 0.005% of S, 0.15-0.5% of Nb, 0.03-0.2% of Ti and the balance of Fe. And the balance of Fe and inevitable impurities. The preparation method comprises the steps of raw material weighing, smelting, forging, hot rolling, homogenizing annealing, cold rolling after acid pickling and cold rolling annealing. The method synergistically improves plasticity, corrosion resistance and contact resistance, is simple and easy to operate, green and environment-friendly, low in cost, short in process, high in efficiency, wide in application range and beneficial to industrial large-scale production and popularization.

The invention discloses a preparation method of a graphite composite bipolar plate, which comprises the processes of raw material homogenization, preheating treatment, hot press molding, demolding, stress relief and cutting and trimming, the raw material homogenization and stress relief processes can significantly improve the yield and product quality, and the problems of low yield, poor batch stability and the like in the prior art are solved; meanwhile, conductive fillers such as graphene, carbon fibers, carbon black, carbon nanotubes and metal fibers are introduced, so that a bridging effect among graphite particles is achieved, a conductive path is broken through, contact resistance is reduced, the overall conductivity of the bipolar plate is improved, the mechanical property of the material can be improved, and the service life of the bipolar plate is prolonged. Particularly, the bending strength is obviously improved; in addition, the method is simple in process, flexible to adjust, low in special equipment requirement, low in equipment investment and suitable for popularization.

A solid oxide cell can comprise a nonporous oxide layer, one or more first porous layers, and one or more second porous layers. The nonporous oxide layer can conduct oxygen ions and can operate as a solid electrolyte. The first and second porous layers can be disposed on opposite sides of the nonporous oxide layer. The nonporous oxide layer can have a density greater than that of each of the first and second porous layers. In some embodiments, at least one of the one or more first porous layers can be infiltrated with one or more electrocatalytic oxides. Alternatively, in some embodiments, a porous functional layer can be disposed between the nonporous oxide layer and the one or more first porous layers. The porous functional layer can be effective to increase an open circuit voltage of the solid oxide cell.

The invention relates to the technical field of flow batteries, in particular to a bromine-chromium flow battery system. According to the invention, one or more of hydrobromic acid, hydrochloric acid and hydroiodic acid are used as additives, and Br2 and the additives in the electrolyte are complexed to form Br2X <-> to exist in the electrolyte, so that battery performance reduction caused by overflow and precipitation of bromine gas in the positive electrolyte is avoided, and the efficiency of the bromine-chromium flow battery is improved; meanwhile, the flow battery system further relieves battery part aging caused by bromine overflow and capacity fading caused by bromine loss through the gas conveying device, so that the service life of the bromine-chromium flow battery is prolonged.

To provide a fuel battery cell that can improve durability of a membrane electrode joined body, and a method for designing a fuel battery cell.SOLUTION: A fuel battery cell comprises: a membrane electrode joined body that generates power by using reaction gas; a pair of gas diffusion layers that sandwich the membrane electrode joined body; and a pair of separators 14 that sandwich the membrane electrode joined body and the pair of gas diffusion layers. The gas diffusion layer has a Young's modulus of 1800 MPa or more and a thickness of 0.12 mm or more and 0.25 mm or less. The separator 14 has a groove 29 that has a branch part 31 and forms a channel 28 for supplying the reaction gas to the membrane electrode joined body. A value obtained by dividing the diameter D of an inscribed circle 33 of the branch part 31 in the groove 29 by a groove width W of a general part 32 other than the branch part 31 in the groove 29 is 2.5 or less.SELECTED DRAWING: Figure 3

The invention relates to a method for manufacturing a bipolar plate (2), comprising the following steps: - Provision of two steel half-sheets (3, 4), wherein at least one of the two half-sheets (3, 4) has an embossed structure (5), - Construction of a three-dimensional metal structure (7) from at least one powder (12) of a metal different from the steel of the half-sheets (3, 4), wherein the metal is selected from the group comprising titanium, titanium alloys, nickel, nickel alloys, chromium, chromium alloys, ferrochrome alloys, copper, copper alloys, silver, silver alloys, or gold, platinum, iridium, rhodium, ruthenium and their alloys, on a first half-sheet (3) of the two half-sheets (3, 4) by means of a laser (10) with green laser light and consequently a wavelength in the range of 495 nm to 550 nm, and - Forming a material-bonded connection of the 3D metal structure (7) with a second half-sheet (4) of the two half-sheets (3, 4) using the same laser (10), wherein the half-sheets (3, 4) are joined to form a bipolar plate (2). The invention further relates to a bipolar plate (2) for an electrochemical cell (20).

Bipolar plate (1) for an electrochemical system, in particular for an electrolyzer, comprising at least one layer (2) and at least one insert (10), the layer (2) comprising - at least one through-opening (3, 4) as an inlet or outlet for a fluid, - a flow field (8) with an electrochemically active region, wherein the insert (10) is arranged at the through-opening (3, 4) and comprises a fluid guidance structure (12) for guiding the fluid, wherein the fluid guiding structure (12) of the insert (10) has several protrusions (14, 24) and is arranged in the flow direction of the fluid between the flow field (8) and the through-opening (3, 4), such that the fluid is guided from the through-opening (3, 4) through the fluid guiding structure (12) between the protrusions (14, 24) to the flow field (8) or vice versa, wherein the fluid guidance structure (12) comprises a first area (18) and a second area (19) which are arranged next to each other in the direction of fluid flow, wherein the elevations (14, 24) in the first area (18) and in the second area (19) each have different distances from each other and / or are arranged at different densities and / or are shaped differently, such that a flow cross-section in the first area (18) is smaller than a flow cross-section in the second area (19) and / or a flow resistance in the first area (18) is greater than a flow resistance in the second area (19).

The utility model discloses a nested fuel cell bipolar plate and a fuel cell stack, which relate to the field of fuel cell stack design, and are characterized in that first polar plates and second polar plates are mutually nested, a first side of a first flow channel of each first polar plate is provided with a plurality of first bulges, and the first bulges form first concave blocks on a second side of the first flow channel; a plurality of second protrusions are arranged on the second side of the second flow channel of each second pole plate, the second protrusions form second concave blocks on the first side of the second flow channel, and third flow channels are formed by gaps between the first concave blocks and the second grooves located in the same column in the vertical direction of the first pole plate and the second pole plate and gaps between the second concave blocks and the first grooves. Different from other nested bipolar plates, the third flow channel is crossed with the first flow channel and the second flow channel, and the third flow channel is formed by retracting the first flow channel and the second flow channel by a certain height, so that the height of the flow channel can be reduced by one, the thickness of the bipolar plate is reduced, and the volume power density of a fuel cell is improved.

The invention discloses a fuel cell metal bipolar plate with a multi-layer composite gradient coating and a preparation method of the fuel cell metal bipolar plate, and relates to a preparation method of a surface coating of a fuel cell metal bipolar plate. The problem that a metal bipolar plate in a fuel cell is poor in corrosion resistance is solved. The Ti / TiN / TiCN multi-layer composite gradient is prepared on a substrate through a multi-arc ion plating technology by regulating and controlling parameters such as air pressure and flow of nitrogen and methane, the coating is composed of a pure Ti base layer and a transition layer with three to five periods, a gradient multi-layer structure is adopted, TiN metal nitride with good conductivity is adopted, and the conductivity of the coating is greatly improved. The interface contact resistance is reduced, meanwhile, the permeation of corrosive liquid and the further corrosion of the corrosive liquid to the coating and the matrix material are effectively prevented, the corrosion resistance of the metal bipolar plate in an acid environment is remarkably improved, and the interface contact resistance of the surface of the metal bipolar plate under the working pressure of a fuel cell is reduced.

A fuel cell stack bipolar plate, includes two half-plates connected to one another and a flow space formed between the half-plates for distributing a coolant flowing into the flow space through an inlet hole of the bipolar plate, located on a first edge of the bipolar plate, and flows out of the flow space through an outlet hole of the bipolar plate, located on an opposite second edge of the bipolar plate, over the area of the bipolar plate's flow field. The flow field debouches at its ends facing toward the first and second edges of the bipolar plate into a distribution region connected to the respective hole. The distribution region includes a pre-distributing channel, which debouches into the respective hole, extends along a direction of the first and second edges of the bipolar plate and has a plurality of throttle apertures arranged distributed and face toward the flow field.

To provide a manufacturing method of a bipolar electrode laminate which is capable of making densities of a cathode active material layer and an anode active material layer desirable and reduces manufacturing steps, and a manufacturing method of a bipolar battery including manufacturing such a bipolar electrode laminate.SOLUTION: A method of manufacturing a bipolar electrode laminate successively comprising a first electrode active material layer, a current collector layer and a second electrode active material layer includes: providing a first electrode mixture containing a first electrode active material and a first binder and a second electrode mixture containing a second electrode active material, a second binder and an electrolyte component; depositing the first electrode mixture on a first face of the current collector layer to form a first electrode active material layer precursor and depositing the second electrode mixture on a second face of the current collector layer to form a second electrode active material layer precursor; pressing a laminate including the first electrode active material layer precursor, the current collector layer and the second electrode active material layer precursor; and solving the electrolyte component in the second electrode active material layer with a solvent after the pressing to generate an electrolytic solution.SELECTED DRAWING: Figure 1

The invention discloses a fuel cell channel number decreasing type snakelike flow field beneficial to water drainage, which comprises a snakelike channel number decreasing type reaction area, the reaction area comprises a plurality of groups of sub snakelike flow channels, the plurality of groups of sub snakelike flow channels are sequentially connected at corners to form a multi-stage reaction area from top to bottom, the channel number in each stage of sub snakelike flow channel is gradually decreased step by step, and the channel number in each stage of sub snakelike flow channel is gradually decreased. An open connection mode is adopted at the connection corner of each stage of sub-snake-shaped flow channel; the multi-channel gas inlet is formed in the initial end of the snake-shaped channel number gradually-decreasing type reaction area; and the few-channel gas outlet is arranged at the tail end of the snake-shaped channel number gradually-decreasing type reaction area. The drainage capacity can be enhanced, the gas inlet and outlet pressure drop can be reduced, and the overall efficiency and stability of the fuel cell are further improved.

The present invention relates to the field of surface treatment technology, and in particular to a preparation method and application of a conductive anti-corrosion coating for a magnesium alloy bipolar plate, wherein the preparation method comprises the following steps: S1, mixing a conductive high molecular polymer, an adhesive and an organic solvent to obtain a coating; S2, coating the coating on the surface of the magnesium alloy to form a coating. The present invention uses a magnesium alloy with extremely low density as a substrate, and arranges a corrosion-resistant coating on the surface of the substrate. The corrosion-resistant coating uses a conductive high molecular polymer such as polyaniline as a matrix material. Polyaniline has corrosion inhibition behavior and anion exchange properties. While protecting the underlying metal substrate, it can exchange anions with chloride ions in a corrosive environment to inhibit the penetration of corrosive anions. At the same time, not only is an adhesive added to enhance the bonding strength between the polyaniline coating and the magnesium alloy and to bond the polyaniline particles, but nano-oxides are also added as corrosion inhibitors to further improve the corrosion resistance of the coating.

The invention relates to the technical field of redox flow batteries, in particular to a flow battery electric pile bipolar plate and a flow battery. The flow battery stack bipolar plate comprises a bipolar plate body, the bipolar plate body is provided with more than two annular spiral grooves, each annular spiral groove forms an annular spiral flow channel, the annular spiral flow channels are used for flowing of electrolyte, the annular spiral flow channels are nested, each annular spiral flow channel is provided with a liquid inlet and a liquid outlet, and the liquid inlet and the liquid outlet are communicated with each other. A liquid inlet and a liquid outlet in each annular spiral flow channel are independent from each other; the annular spiral flow channels on the bipolar plate of the redox flow battery stack can be independently controlled and do not influence one another, the flowing speed, the flow and the distribution uniformity are completely kept consistent, and the performance of a redox flow battery is improved.

The invention belongs to the technical field of flow batteries, and discloses a flexible graphite bipolar plate with a self-repairing function and a preparation method and application thereof. The flexible graphite bipolar plate comprises a flexible graphite-polymer composite matrix, microcapsules and a graphene conductive layer, wherein the graphene conductive layer is arranged on the surface of the flexible graphite-polymer composite matrix; the microcapsule is dispersed in the flexible graphite-polymer composite matrix, the core of the microcapsule is a liquid metal alloy, the liquid metal alloy contains Ga, and the shell of the microcapsule is polyurethane. The microcapsules containing the liquid metal alloy are introduced into the flexible graphite bipolar plate in situ, and when the flexible graphite bipolar plate generates microcracks due to mechanical stress, thermal cycle and the like, the internal microcapsules are broken at the first time to release the liquid metal and fill the cracks, so that the graphite bipolar plate still keeps relatively high mechanical strength and air tightness, and the service life of the flexible graphite bipolar plate is prolonged. Therefore, the conductive stability and the use durability of the flow battery are improved.

The utility model relates to a bipolar plate of a hydrogen fuel cell and the hydrogen fuel cell, comprising a substrate on which a manifold region, a gap bridge region, a distribution region and an activation region are arranged; the activation area is used for catalyzing and reacting the gas; the activation area comprises a flow channel unit, the flow channel unit comprises a plurality of gas flow channels extending in the first direction, each gas flow channel comprises a straight area, a bent area, a first variable-diameter area and a second variable-diameter area which are sequentially arranged in the first direction, the first direction is the same as the length direction of the substrate, and the second direction is the same as the length direction of the substrate. The straight areas of every two adjacent gas flow channels are parallel to each other, and the bending directions of the bending areas of every two adjacent gas flow channels are parallel to each other. The bipolar plate disclosed by the utility model can improve the performance of the electric pile, and the electric pile adopting the variable-flow channel is higher in power for the electric pile with the same number of pieces. Moreover, the bipolar plate can reduce in-plane power generation deviation, so that electrochemical reaction is more uniform, the consistency of an electric pile is better, and the service life is effectively prolonged.

The invention belongs to the technical field of fuel cells, and particularly relates to a self-absorption humidification type fuel cell bipolar plate, which comprises a bipolar plate body, the bipolar plate body comprises an anode plate and a cathode plate, the middle parts of the anode plate and the cathode plate are respectively provided with a runner region, and a plurality of runner structure groups are arranged in the runner regions. Each runner structure group comprises a first runner, a second runner, a third runner and a fourth runner; a first injection water return structure is arranged between the first flow channel and the second flow channel, and a second injection water return structure is arranged between the third flow channel and the fourth flow channel; according to the bipolar plate, the injection water return structure is integrated, high-humidity reaction gas obtained after reaction is utilized, water and gas are mixed and collected to the water collecting area, due to the fact that pressure difference exists between the injection water return structure and the water collecting area, the water and the gas are mixed and enter the injection water return structure, and humidification of the reaction gas is achieved; normal operation of the fuel cell can be guaranteed without pre-humidification of the reaction gas, the risk of flooding of the fuel cell can be reduced, and stable guarantee is provided for work of the fuel cell.

The present disclosure relates to a bilayer polyelectrolyte membrane comprising a first layer and a second layer wherein the first layer comprises a perfluorosulfonic acid and the second layer comprises a cross-linked polysulfonated polymer, and wherein the first layer is disposed on the second layer. The present disclosure also relates to a method of manufacturing the bilayer polyelectrolyte membrane, and a membrane electrode assembly and a fuel cell comprising the bilayer polyelectrolyte membrane.

The invention belongs to the technical field of electrochemical energy storage, and discloses a flow battery composite membrane material and a preparation method thereof, and the preparation method comprises the following steps: spraying a ZIF-8 metal organic framework solution to the positive electrode side of a microporous diaphragm, and drying to obtain the flow battery composite membrane material. According to the zinc-bromine flow battery and the preparation method thereof, ZIF-8 acts on the positive electrode side of the microporous diaphragm, ZIF-8 shows good chemical stability in an acidic electrolyte environment of the zinc-bromine flow battery and is not easily oxidized and degraded by bromine, and a stable framework ensures that a screening pore channel is kept complete in long-term operation and continuously plays a role in resisting bromine, so that the corrosion of a zinc negative electrode and the loss of bromine active substances are reduced, and the service life of the zinc-bromine flow battery is prolonged. The problems of low bromine permeation and bromine reaction rate on the positive electrode side of the zinc-bromine flow battery and the like can be effectively solved, and the coulombic efficiency and the voltage efficiency can be remarkably improved, so that the microporous diaphragm with excellent comprehensive performance is obtained.