1595results 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 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 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.

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 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 method for manufacturing a bipolar plate (10, 51) for an electrochemical cell unit (53) for converting electrochemical energy into electrical energy as a fuel cell unit (1) and / or for converting electrical energy into electrochemical energy as an electrolytic cell unit (49) having stacked electrochemical cells (52), the method comprising the steps of: providing a first plate 64) and a second plate (65), stacking the first plate (64) and the second plate (65) on top of one another such that inner surfaces (66) of the first and second plate (64, 65) lie on top of one another, applying contact forces to the first and second plates (64, 65) by means of negative pressure in a negative pressure chamber (104) relative to an ambient pressure so that, as a result of the contact forces applied by the ambient pressure, the inner surfaces (66) of the first and second plate (64, 65) lie on top of one another with an additional compression force in a contact region (68) due to the applied contact forces, producing at least one welded joint (69) between the first and second plate (64, 65) by means of a laser beam (74), forming connection channels (89) for process fluids in the first and / or second plate (64, 65), the channels opening into fluid openings (41) in the bipolar plates (10), 51) and into channels (12, 13, 14) for process fluids in the bipolar plates (10, 51), forming connection openings (93) in the first and / or second plate (64, 65) which connect the connection channels (89) to the channels (12, 13, 14) for process fluids in the bipolar plates (10, 51), the connection openings (93) being formed in the first and / or second plate (64, 65) by means of a laser beam (74).

The invention relates to the technical field of flow batteries, in particular to a flow battery electrode frame assembly and a battery unit.The flow battery electrode frame assembly comprises a mother frame, a public flow channel is formed in the mother frame, an internal flow channel set and an electrode cavity are formed in the mother frame, and the internal flow channel set communicates with the public flow channel and the electrode cavity; when the two adjacent mother frames are attached face to face, the internal flow channel sets on the two mother frames coincide and communicate with each other in the thickness direction of the mother frames, and the common flow channels on the two mother frames communicate with each other. The son frame is arranged on the mother frame; and the bipolar plate is arranged between the secondary frame and the primary frame. The electrode frame has the effect of increasing the depth of the flow channel within the limited thickness of the electrode frame.

A bipolar plate-gas diffusion layer (GDL) assembly for a polymer-electrolyte-membrane fuel cell includes a flat metallic bipolar plate and a porous metal GDL adjacent to and in direct contact with the flat metallic bipolar plate. The porous metal GDL includes flow channels defined by flow channel walls with flow channel surfaces. The flow channel walls and flow channel surfaces have an average porosity generally equal to an average porosity of an interior of the porous metal GDL.

The application relates to the technical field of all-vanadium redox flow batteries, and discloses an integrated electrode plate and a preparation method and application thereof, which comprises the following steps: mixing and calcining a metal organic framework material and polyvinylpyrrolidone to obtain a porous carbon material; uniformly melting and mixing the porous carbon material, resin and conductive carbon material, and performing die forming to obtain a modified bipolar plate; using silver-coated copper powder as a conductive filler, and using epoxy modified acrylic resin as an organic carrier to prepare ultraviolet light curing silver-coated copper conductive adhesive; and bonding the electrode and the modified bipolar plate through ultraviolet light curing to prepare the integrated electrode plate. The porous carbon is obtained by using a polyvinylpyrrolidone-assisted limited carbonization method, the conductivity of the bipolar plate is improved, epoxy modified acrylic resin is used as the organic carrier, the silver-coated copper powder is uniformly distributed in the organic carrier, the conductivity of the conductive adhesive is improved, and the integrated electrode plate improves the performance of the flow battery.

To provide a fuel cell that can be constructed thinly while ensuring sufficient thickness of the gas diffusion layer. [Solution] A fuel cell cell that generates electricity by the reaction of a reaction gas comprises a membrane electrode assembly having an electrolyte membrane and a catalyst layer, a gas diffusion layer laminated on the membrane electrode assembly and made of a porous metal, and a separator laminated on the gas diffusion layer and parallel to the plane direction of the membrane electrode assembly, wherein the gas diffusion layer has grooves through which the reaction gas flows on the separator side.

To provide a fuel cell cell having a separator that can improve drainage performance. [Solution] The fuel cell cell comprises a membrane electrode assembly, a pair of gas diffusion layers provided so as to sandwich the membrane electrode assembly, and a pair of separators provided so as to sandwich the pair of gas diffusion layers. At least one of the pair of separators has a flow channel portion through which the reaction gas flows on the surface facing the gas diffusion layer, and a rib portion provided adjacent to the flow channel portion and in contact with the gas diffusion layer. The flow channel portion has a bottom surface away from the gas diffusion layer and a side portion connecting the bottom surface and the rib portion, and the side portion is provided with a groove extending from the connection portion with the rib portion toward the bottom surface.

A separator for a fuel cell includes a rectangular plate-shaped body. The body forms passages through which gas flows. The body includes central regions and a reversing region. The central regions extend along one side of the body, and are arranged in a direction in which another side of the body that intersects the one side extends. The passages include multiple central passage sections that extend in the longitudinal direction through each central region, and a reversing passage section that extends through the reversing region and connects the central passage sections of adjacent ones of the central regions. The ribs are formed such that two or more of the central passage sections are formed in each of the central regions, and the reversing passage section in the reversing region is connected to two or more of the central passage sections in the corresponding central region.

The invention discloses a composite forming process of a bipolar plate of a multilayer flow battery, which comprises the following steps of: placing a metal foil in a punching machine for rolling and punching to obtain a perforated metal foil; cleaning the perforated metal foil with alcohol, stacking the flexible graphite paper, the perforated metal foil and the flexible graphite paper according to a sandwich structure, and rolling and forming by a roller press to obtain a composite bipolar plate; and carrying out infiltration, cleaning, curing and drying treatment on the pressed composite bipolar plate to obtain the multilayer flow battery bipolar plate. According to the composite forming process of the bipolar plate of the multilayer flow battery, the perforated metal foil is used as the interlayer, the flexible graphite paper is used as the upper layer and the lower layer, and a'sandwich 'structure is constructed by adopting a sprint process, so that the prepared bipolar plate of the multilayer flow battery is high in combination degree, and layering of the metal foil and the flexible graphite paper can be avoided; the bending strength and the conductivity of the bipolar plate of the multilayer flow battery are effectively improved, the contact resistance is reduced, and a better conductive network is constructed.

The invention relates to a fuel cell membrane electrode assembly, a single cell and a fuel cell, the fuel cell membrane electrode assembly comprises a proton exchange membrane and a membrane electrode frame, the membrane electrode frame comprises a first frame connected to the cathode side of the proton exchange membrane, and one side, connected with the proton exchange membrane, of the first frame is further connected with a second frame; the thickness of the first frame is smaller than that of the second frame. According to the fuel cell, the first frame and the second frame are asymmetrically designed on the two sides of the proton exchange membrane, so that a space condition can be provided for increasing the flow channel depth of a cathode distribution area, the air or oxygen flow resistance on the cathode side is remarkably reduced, and the overall electrochemical reaction efficiency of the fuel cell is improved. Due to the low-density characteristic of hydrogen, the overall flow resistance of the anode is relatively small, so that the flow channel depth of the anode side distribution area is not changed or is properly reduced. And meanwhile, the first frame and the second frame form the membrane electrode frame with the double-layer structure, so that the packaging process is reduced, and the material cost and the process cost are reduced.

The invention relates to the technical field of electrochemical energy storage, in particular to a carbon-plastic composite bipolar plate, a preparation method and a flow battery, the carbon-plastic composite bipolar plate comprises a conductive copper material layer, a fine powder dry blank layer, a transition powder layer and a coarse powder dry blank layer, each of the fine powder dry blank and the coarse powder dry blank comprises 60-90% by mass of a conductive carbon material and 10-40% by mass of a resin material; the conductive copper material is used as the middle layer to improve the conductivity and mechanical strength of the bipolar plate; the coarse powder blank is few in particle gap and good in compactness after being subjected to hot pressing, and can greatly block infiltration of electrolyte as a surface layer material, so that the corrosion resistance of the bipolar plate is remarkably improved; the interface contact area is large and the mechanical property is good after fine powder blank making and hot pressing, the conductivity and the mechanical strength of the bipolar plate can be remarkably improved by wrapping the conductive copper layer, and internal swelling is not prone to occurring; the transition powder can promote interlayer cross-linking of coarse and fine powder, and interface resistance is reduced. The problems that a carbon-plastic composite bipolar plate is poor in conductivity and easy to swell inside and a flow battery is low in assembling and pressing mechanical strength are solved.

The invention belongs to the field of long-time energy storage, and provides a flow battery flow field structure with periodic gradient characteristics and a flow battery. The flow field structure comprises a base plate, a groove-shaped snakelike flow channel arranged on the base plate and a plurality of separating ribs, the snakelike flow channel is composed of a plurality of wide flow channels, a plurality of narrow flow channels and a plurality of connecting flow channels, the wide flow channels and the narrow flow channels are parallel to each other and are alternately arranged, the adjacent wide flow channels and narrow flow channels are separated by the separating ribs, and the connecting flow channels are connected with the connecting flow channels. The connecting flow channel is positioned at one end part of the separating rib, and the adjacent wide flow channel and narrow flow channel are communicated through the connecting flow channel in an end-to-end manner; the ratio of the width of the wide flow channel to the width of the narrow flow channel is (1.2-15): 1, and the width of the flow channel where the inlet of the snakelike flow channel is located is equal to the width of the flow channel where the outlet of the snakelike flow channel is located. The dynamic pressure gradient is established between the adjacent flow channels through periodic regulation and control of the width of the flow channels, convection under ribs is strengthened, permeation of electrolyte in the thickness direction of the electrode can be promoted, the distribution uniformity of reactants in the electrode is improved, and polarization loss is effectively inhibited.

The invention provides an optimal design scheme of a bipolar plate of a fuel cell, relates to the technical field of fuel cells, and aims to solve the technical problem of relatively low power generation performance of an existing fuel cell. The fuel cell bipolar plate comprises two single plates, a gas inlet area, a distribution area and a reaction area are arranged on the first surface of each single plate, the gas inlet area comprises a plurality of first flow channels, the distribution area comprises a plurality of second flow channels, the reaction area comprises a plurality of third flow channels, and each first flow channel is communicated with at least one third flow channel through the corresponding second flow channel; a second distance is formed between the bottom surface of the second flow channel and the first surface of the veneer, a third distance is formed between the bottom surface of the third flow channel and the first surface of the veneer, and the second distance is larger than the third distance; the first surface of the single plate faces the surface of the proton exchange membrane. The bipolar plate of the fuel cell can improve the power generation efficiency of the fuel cell.

The invention belongs to the technical field of surface engineering, and relates to a preparation method of a protective coating for a metal connector of a solid oxide battery. A compact transition metal oxide inner layer is deposited on a metal substrate in a reactive sputtering mode, then a transition metal alloy outer layer is deposited in a metal sputtering mode, a transition metal oxide / transition metal alloy composite coating is formed, and a spinel protective layer is formed after annealing treatment. According to the method, a transition metal oxide inner layer is used as a diffusion barrier layer, diffusion of elements such as Cr from a substrate to a coating and diffusion of oxygen to the substrate in the high-temperature annealing and long-term service process are effectively inhibited, and therefore the thickness of a reaction layer and the thickness of a thermal growth oxide layer are remarkably reduced. The composite coating is compact in structure, stable in component, good in matching with the thermal expansion coefficient of the substrate, excellent in oxidation resistance and low in surface specific resistance, and capable of effectively improving the long-term operation stability and prolonging the service life of the SOC connector.

A method for producing layered sheet structures from titanium or titanium alloy metal for use in or as electrodes of PEM-type electrolyzers or fuel cells. The method includes providing a first sheet-like green part with voids or open spaces, where first sheet-like green part is a green part of a first metal sheet layer. The method alternatively includes providing a first metal sheet layer comprising a metallic frame structure with voids or open spaces. The method further includes providing a second sheet-like green part, where second sheet-like green part is a green part of a second metal sheet layer, which is porous. The method alternatively includes providing a second metal sheet layer, which is porous. The method further includes forming a stack with a combination of the first and second sheet-like green part and the first and second metal sheet. The method further includes bonding the metal sheet layers.

A power transmission device (38) for a fuel cell unit (1) or a fuel cell system (2), comprising a device housing (39), at least two current conductors (48, 50) for conducting the electrical current generated by a fuel cell stack (3), at least one contact element (79) arranged on each current conductor (48, 50) for mechanically and electrically contacting a respective counter-contact element (81), at least one counter-contact element (81) and one counter-contact element (81) each being mechanically and electrically connected to a respective contact element (79), at least one sensor cable (78) and one sensor cable (78) each being mechanically and electrically connected to a respective counter-contact element (81), at least one sensor for detecting the voltage and / or the current of the electrical current conducted through the at least two current conductors (48, 50) of the electrical current generated by the fuel cell stack (3),wherein the at least one contact element (79) is formed in one piece with the respective current conductor (48, 50).

The invention provides a flow battery, and relates to the technical field of batteries. According to the specific technical scheme, the flow battery comprises a first electrolyte, a first bipolar plate and a first electrode, the first bipolar plate is in contact with the first electrolyte, the first electrode is in contact with the first electrolyte, the first electrode is fixed to the first bipolar plate, and the first electrolyte can be subjected to an oxidation-reduction reaction on the first electrode; a first electrode layer is arranged on the first bipolar plate, and the first electrolyte can be subjected to oxidation-reduction reaction on the first electrode layer; by adopting the scheme, the electrochemical active area of the electrode in the flow battery can be increased, more active sites are provided for the oxidation-reduction reaction of the active substance in the first electrolyte, the internal resistance of the flow battery is reduced, and the power and energy efficiency of the flow battery are improved.

To create an electrochemical device comprising several electrochemical units arranged successively along a stacking direction, each comprising at least one perforated plate, a bipolar plate, and a membrane assembly, which enables simple and precise positioning of the membrane assembly of an electrochemical unit relative to another, at least partially metallic element of the same electrochemical unit and / or relative to an at least partially metallic element of another electrochemical unit during assembly of the electrochemical device, it is proposed that each electrochemical unit include a positioning device for positioning the membrane assembly in at least one transverse direction, oriented perpendicular to the stacking direction, relative to another,includes at least a partially metallic element of the same electrochemical unit and / or relative to at least a partially metallic element of another electrochemical unit.

The invention relates to a method for manufacturing a bipolar plate string (214), the method comprising the steps of: - providing a monopolar plate string (200, 202), - guiding the monopolar plate string (200, 202) in the direction of a roll gap (104) of a roll pair (106) of a roll arrangement (102) provided with a roll structure (112), - emitting a laser beam (110) of a laser arrangement (108) onto a rotating, mirrorized polygonal wheel (146), whereby the laser beam (110) is aligned towards a plurality of individual positions of a surface (210, 212) of one or both of the monopolar plate strings (200, 202) and thus the individual positions are heated to a joining temperature directly before or at the time the monopolar plate string (200, 202) enters the roll gap (104), and - joining the monopolar plate string (200, 202) into the bipolar plate string (214) at at least one of the individual positions of the surface (210, 212) under pressure while the monopolar plate string (200, 202) is transported through the roll gap (104). The invention also relates to a method for manufacturing a bipolar plate and to an apparatus (100) for performing the method.

The present invention provides a membrane electrode assembly which is provided with: a polymer electrolyte membrane; a pair of electrode catalyst layers that are in contact with the surfaces of the polymer electrolyte membrane, while having the polymer electrolyte membrane sandwiched therebetween; and gas diffusion layers that are respectively superposed on the pair of electrode catalyst layers. Each of the gas diffusion layers comprises a microporous layer that is in contact with one of the electrode catalyst layers, and a diffusion base material layer that is formed of a fiber base material. The average fiber diameter of fiber materials contained in the diffusion base material layer is 10 to 150 times the average fiber diameter of fibrous substances contained in the electrode catalyst layers.

To provide a fuel cell column capable of achieving a smaller temperature distribution within fuel cell stacks and within the column as a whole.SOLUTION: A fuel cell column 140 includes a plurality of fuel cell stacks 14, at least one fuel manifold 204 configured to provide fuel to the plurality of fuel cell stacks 14, and at least one heat sink insert 301 located between adjacent fuel cells of the plurality of fuel cell stacks.SELECTED DRAWING: Figure 2

The invention discloses a metal stack cavity header tube region polar plate anti-corrosion structure and an applied stack thereof. The stack comprises a plurality of groups of stacked metal bipolar plates, wherein a corrosion sacrifice structure is arranged on the metal bipolar plate on the high-voltage side of a fuel cell stack close to the liquid outlet side of a circulation cavity in an extending manner along a second direction; according to the corrosion sacrifice structure, the overlapped edge area of the metal bipolar plate and the insulating sealing gasket can be subjected to electrochemical corrosion preferentially, corrosion of the interior of a galvanic pile to a polar plate material is reduced and avoided, a corrosion reaction can occur preferentially in a designed corrosion area, and on the premise that the material cost is not increased and the design compactness is not sacrificed, the service life of the galvanic pile is prolonged. The discharge area can be effectively increased, corrosion current can be intercepted in advance, the corrosion resistance of the metal bipolar plate is effectively improved, the highest potential and the reaction active area of the adjacent power generation unit are protected, and the service life of the fuel cell stack is remarkably prolonged.