3061results about "Collectors/separators" patented technology

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 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 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 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).

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.

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.

An electrochemical cell wherein electrolyte flows through the cell, as in a redox flow battery or a fuel cell, uses electrolyte(s) which are in a state of elastic turbulence in contact with the electrode(s). The elastic turbulence enhances transport of electrochemically reactive species to the surfaces of the electrode(s) and the transport of reaction products away from those surfaces.

The invention relates to a solid oxide fuel cell and a preparation method thereof. The solid oxide fuel cell comprises a sheet substrate, a first cell monomer and a second cell monomer, wherein the first cell monomer and the second cell monomer are fixed on the front and back surfaces of the sheet substrate; each of the first battery monomer and the second battery monomer comprises a porous supporting layer, an anode functional layer, an electrolyte layer and a cathode functional layer which are sequentially stacked and connected; the sheet body substrate is connected between the porous support layer of the first battery monomer and the porous support layer of the second battery monomer; a separation groove is formed in the sheet body substrate, and a fuel gas flow channel is formed among the separation groove, the first battery monomer and the second battery monomer. After the pipeline connected with the fuel gas is communicated with the fuel gas flow channel, the fuel gas only flows in the fuel gas flow channel, and the fuel gas flow channel has good sealing performance. And the porous supporting layer, the anode functional layer, the electrolyte layer and the cathode functional layer are planar sheet bodies which are printed and formed layer by layer, so that the manufacturing difficulty is low, industrial large-scale manufacturing is facilitated, and the production cost is reduced.

The present invention discloses a fuel cell metal bipolar plate and a fuel cell, wherein the fuel cell metal bipolar plate comprises a cathode plate (25), an anode plate (24), and a coolant flow field (28) formed between the cathode plate (25) and the anode plate (24), wherein a plurality of parallel wavy flow channels (23) are arranged in the middle of the cathode plate (25), and a plurality of parallel straight flow channels (22) are arranged in the middle of the anode plate (24). The fuel cell metal bipolar plate of the present invention can allow the reaction gas to flow evenly in the flow field, so that the reaction is sufficient, thereby improving the output performance of the fuel cell.

The invention discloses a high-potential-corrosion-resistant composite coating as well as a preparation method and application thereof. The high-potential-corrosion-resistant composite coating comprises a metal transition layer, a graphite-like amorphous carbon layer and a SnO2 hole sealing layer which are sequentially formed on the surface of the metal bipolar plate serving as a substrate, wherein the SnO2 hole sealing layer is prepared in an atomic layer deposition mode. According to the high-potential-corrosion-resistant composite coating provided by the invention, the SnO2 layer is deposited on the surface of the amorphous carbon coating, so that the effect of closing amorphous carbon defects is achieved, and the high-potential-corrosion-resistant composite coating has excellent corrosion-resistant protection performance under 1.6 V high-potential corrosion.

The invention belongs to the technical field of bipolar plate materials for flow batteries, relates to a composite bipolar plate material as well as a preparation method and application thereof, and is suitable for bipolar plate materials for flow batteries. According to the bipolar plate of the flow battery, the three-dimensional porous foam metal is used as the matrix and is positioned in the middle layer, so that the overall strength and toughness of the bipolar plate can be improved, and meanwhile, the problems of local overheating and the like caused by non-uniform heating of zinc deposition in a charge-discharge test of a sedimentary flow battery such as a zinc ferroelectric pile are solved, so that the long-term operation of the battery is influenced; and the porous foam metal can well transfer heat and enable the heat to be uniformly distributed, so that the porous foam metal has a good application prospect in the sedimentary flow battery. The composite material is adhered to the two sides of the bipolar plate through a hot pressing process, so that the corrosion resistance of the bipolar plate can be ensured, meanwhile, the foam metal constructs an efficient conductive network in the bipolar plate, the foam metal and the composite material can form a synergistic conductive effect, and the electron transmission capability of the bipolar plate is also improved; in the manufacturing process, carbon paper / carbon fiber cloth is added to the upper side and the lower side at the same time, so that the surface resistance of the bipolar plate is reduced, and the performance of the bipolar plate in a flow battery is further improved.

The invention relates to a Y-doped Ti-Mn-based solid hydrogen storage alloy and a preparation method thereof, belongs to the technical field of hydrogen storage alloy materials, and has the advantages of easiness in activation, high hydrogen absorption and desorption speed, moderate hydrogen absorption and desorption plateau pressure and long cycle life. The invention provides a Y-doped Ti-Mn-based hydrogen storage alloy, which is characterized in that the chemical general formula of the hydrogen storage alloy is Ti1-x-yYxZryMn2-w-vVwFev, in the formula, x, y, w and v represent atomic ratios, 0.02 < = x < = 0.08, 0.05 < = y < = 0.15, 0.3 < = w < = 0.5, and 0.1 < = v < = 0.2. The hydrogen storage alloy is excellent in hydrogen storage performance and can be completely activated by absorbing hydrogen for the first time under the conditions of 25 DEG C and 3 MPa, the hydrogen storage capacity is larger than or equal to 1.90 wt%, the hydrogen absorption plateau pressure is larger than or equal to 0.35 MPa, the hydrogen desorption plateau pressure is smaller than or equal to 0.26 MPa, and the hydrogen absorption retention rate of the alloy is larger than or equal to 97.52% after the alloy is cycled for 1000 times.

The invention relates to a bipolar plate for an electrochemical system. The electrochemical system can, in particular, be a fuel cell system, an electrochemical compressor, an electrolyzer, or a redox flow battery. It can comprise a plurality of such bipolar plates. An electrochemical system with a plurality of such bipolar plates is also disclosed.

The invention discloses a bipolar plate with a composite carbon coating, a preparation method, an electrode and a battery, the bipolar plate comprises a substrate layer, a transition layer and a composite functional layer, the substrate layer is a metal layer formed by depositing metal Me on the surface of a substrate; the transition layer is formed on the substrate layer and is a metal Me / C layer; the composite functional layer is formed on the transition layer and is far away from the transition layer and comprises a first GLC layer with internal stress relieving and electron conduction functions, a tetrahedral amorphous carbon ta-C layer with a corrosion ion blocking function and a conductive and hydrophobic second GLC layer which are sequentially arranged. The coating provided by the invention has relatively low contact resistance, good ion corrosion resistance and hydrophobic property, and meets the requirement of long-term service of a fuel cell under a durable working condition.

The invention discloses a preparation method and application of a composite bipolar plate, and belongs to the technical field of flow batteries. According to the method, firstly, the carbon nanotubes are modified, so that the defect that the carbon nanotubes are easy to aggregate is overcome, the conductivity is enhanced, and the compatibility with a resin base material is better; secondly, the fluidized bed reactor is used for reaction, so that the reaction time is saved; finally, the composition is preheated and mixed through an airflow dryer, so that mixing is more uniform, the forming property of the bipolar plate is better, the preparation method is simple, the reaction time is short, the reaction efficiency is high, the formed bipolar plate can be applied to assembly of a redox flow battery electric pile through laser welding, and the bipolar plate has excellent conductivity and mechanical strength and is easy to industrially produce.