KR101962267B1 - Stack Assembly with High temperature Fuel Cell Unit-cell with Homopolar plates - Google Patents

Abstract

The stack assembly in which the pressurizable high-temperature type fuel cell unit cells according to the present invention are stacked comprises a stretchable hollow cell box, a plurality of cathode common plates arranged to be electrically integrated with the cell box in the cell box, A plurality of anode common plates disposed between the plurality of cathode anode plates and connected to the fuel inlet and outlet ends of the cell box at the same time as the plurality of anode common plates and the plurality of anode common plates, And a plurality of anode electrodes disposed between the plurality of anode common plates and the electrolyte matrix, and a plurality of cathode electrodes disposed between the plurality of anode cathode plates and the electrolyte matrix, and a plurality of anode electrodes disposed between the plurality of anode common plates and the electrolyte matrix. Fuel cell unit cell; A cell box electrical insulator disposed between the cell boxes constituting the plurality of fuel cell unit cells to induce electrical insulation; And a header insulator disposed between the anode header and the anode header to induce electrical insulation, wherein the anode header and the cell box are coupled at a cell box connection point, and the plurality of cell boxes and the plurality of anode heads Are sequentially stacked to form a stack.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to stack assemblies,

[0001] The present invention relates to a stack assembly in which pressurizable high-temperature type fuel cell unit cells are stacked. More particularly, the present invention relates to a stack assembly in which a cell or a cell adjacent thereto is deteriorated And more particularly, to a stack assembly in which a partially replaceable pressurizable high temperature type fuel cell unit cell is stacked.

A fuel cell is a device that directly converts chemical energy into electric energy through hydrogen oxidation reaction in the anode and oxygen reduction reaction in the cathode (cathode). As an embodiment of the fuel cell, a molten carbonate fuel cell injects a fuel gas convertible into hydrogen into a fuel electrode, and supplies carbon dioxide and air (oxygen) to the air electrode to induce an electrochemical reaction under a certain operating temperature It produces electricity.

The molten carbonate fuel cell having a method of converting the fuel gas into hydrogen in the battery is called an internal reforming molten carbonate fuel cell. The steam reforming reaction (steam reforming reaction, CH ₄ + 2H ₂ O ⇒ 4H2 + CO ₂ ), and commercial products are sold by FuelCell Energy and POSCO Energy in the US.

The steam reforming reaction is an endothermic reaction requiring proper heat energy to produce hydrogen. Since the reaction heat of the fuel cell is used as a direct energy source, when a certain amount of the reforming catalyst is placed inside the cell, the thermal equilibrium of the endothermic- So that an appropriate operating temperature can be maintained.

The fuel cell has a bipolar plate 0 composed of an anode current collector (or gas diffusion layer) having a gas flow path on both sides and a cathode current collector. An anode and a cathode are attached to each current collector to form a cell package When stacking the cell package and electrolyte membrane (or matrix) on the end plate according to the planned output and applying a constant load between the upper and lower end plates to improve the adhesion between the cell parts, Stack is completed.

However, in the case of polymer electrolyte fuel cells (PEMFC, DMFC) or medium temperature fuel cell (PAFC) operated at low temperature, since components constituting the cell package can be separated at room temperature, However, a molten carbonate fuel cell or a solid oxide fuel cell, which is a high temperature type fuel cell, has a structure in which separation-reloading is impossible. This is because, in the case of a molten carbonate fuel cell, the electrolyte in a liquid state is uniformly distributed in the fuel electrode and the air electrode at the operating temperature, and when the temperature is lowered, a matrix between the cell package and the cell package and a solid body in which the electrolyte in the fuel electrode- .

Since the solid oxide fuel cell uses a solid oxide which is susceptible to thermal deformation as an electrode and a support component and is manufactured from an electrode assembly in which an anode, an electrolyte and a cathode are integrated in the manufacturing process in order to minimize contact resistance, It becomes difficult. In addition, when the fastening load is removed, if there is a weak vicinity due to any reason, it will cause breakage such as a crack and cause permanent damage.

Therefore, in a high temperature type fuel cell, it is not possible to separate only the cells from the assembly in the prior art, even if the performance of one or several cells in a stack of several hundred cell packages is reduced or a fatal defect occurs. We have no choice but to dispose of ourselves.

The electrode manufacturing process of the molten carbonate fuel cell is performed by a separate process in which the electrode size is 7,000 cm 2 or more to assure the output per unit cell of 850 W or more. The slurry in which the organic material and the raw material are mixed is evenly dispersed to form a long roll, or the metal powder as a raw material is uniformly distributed on a support and then sintered in a high-temperature reduction furnace. After the anode and the cathode are adhered to the anode reaction part and the cathode reaction part in the cell package assembling process, the prepared electrode is made to be one cell package by increasing the contact degree by applying a certain load. However, the electrode manufacturing process of the prior art requires an expensive manufacturing apparatus and has a disadvantage of high manufacturing cost because it is composed of a plurality of processes.

On the other hand, in the conventional technology in which the separator is introduced, the output limitation of the stack due to the increase of the contact resistance is recognized as a serious technical difficulty. In the process of making the cell package, a plurality of metal plates are overlapped and welded, and an electrode manufactured through a separate process is physically attached. In this case, a corrosion layer is formed at the contact point between the electrode and the metal plate, and the formed corrosion layer acts as an electrical resistance between the electrode and the metal plate, thereby increasing the resistance, resulting in a voltage drop and a local temperature rise, And shorter life span. In addition, stacks fabricated by laminating hundreds of cells have a phenomenon in which they are deflected in one direction from a certain vicinity due to a temperature gradient in the stack height direction and a temperature gradient occurring between the inlet and outlet of each cell sheet. This results in a load distribution that deflects the distribution of the applied fastening force in a specific direction using an external structure to improve the contact of the cells, and as a result makes contact between the cell parts difficult.

In order to solve this problem, the prior art attempts to adjust the distribution of the reforming catalyst inside the stack, to improve the quality of parts production, or to make the temperature and composition of the reaction gas flowing into the stack uniform. However, due to the characteristics of the structure of the separator, there is a problem that it is difficult to completely control contact resistance generation and deepening.

(Patent Document 1) KR10-1198629 B

(Patent Document 2) KR10-0645190 B

(Patent Document 3) KR10-2014-0020885 A

(Patent Document 4) KR10-2015-0127735 A

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and it is an object of the present invention to provide a fuel cell module that can be used in a conventional bipolar plate fuel cell cell package, To provide a stack assembly. Still another object of the present invention is to provide an electrical connection method of a stack comprising a cell box having a coin-shaped plate, a method of supplying a reactive gas, a stack structure, and a structure of a stack / module.

Specifically, one cell package box has a structure in which several anode and cathode cathode plates are sequentially disposed in a box and surrounded by a matrix impregnated with an electrolyte. The cathode plate has a reaction part having a plurality of pores and a gas inlet / There is an electrolyte reservoir for buffering changes in the electrolyte composition during a long-term operation for several tens of thousands of hours. The cathode cathode plate is integrated with the cell box to make the cell box cathode, and the anode cathode plate has a gas A high temperature type fuel cell stack in which a coin cell package box integrated with a fuel distributor at an entrance and exit of a fuel cell stack, in which one cell composed of an anode and a cathode are implemented, is sequentially stacked with an electrical insulator.

In order to achieve the above object, a cell box used in a stack assembly in which a unit cell of a pressurizable high-temperature type fuel cell unit according to the present invention is stacked includes a plurality of anode common plates and a cathode common plate sequentially stacked in one cell package box A plurality of anode anode plates are connected in parallel with the cell package box to form an integrated cathode and a plurality of anode anode plates located inside the cell package box are connected to an anode header of a fuel inlet end to have an anode polarity.

When the cell box is sequentially stacked with the electric insulator having the same length and the same length, and the anode header for supplying the reaction gas to the anode common plate is sequentially stacked with the electric insulator, each cell box becomes completely electrically insulated , A cell box with a cathode polarity and an anode header are connected in series to form a stack composed of several tens to several hundred cell boxes.

The electrical insulator between the cell box and the cell box must have a dc voltage-current insulation and a buffering function against deformation of the cell box, and should be able to physically / mechanically separate from the cell box for easy replacement of the cell box. do.

The stack / module also has a connection terminal that connects the anode and the cathode of the cell box in series, and finally the anode and the cathode bus bar are exposed to the outside. The connection terminal block is extended in the direction of the tightening device from the side base of the stack / module enclosure, and the cathode connection terminal is formed on the connecting part for joining the cathode anode plate and the cell box enclosure during manufacture of the cell box, It can be completed by serially connecting in series between the header supports. In particular, the connection terminal block is preferably installed in the lower base insulation layer of the stack / module enclosure to prevent the occurrence of contact resistance due to high temperature corrosion.

The stack / module has a surface pressure plate at the top and bottom to prevent high temperature deformation or displacement of the cell box, and a separate fastening device for applying an appropriate load to the surface pressure plate is located outside the stack / module enclosure. The size of the face plate has a transverse dimension similar to the cell box size and has concave grooves on the four corners to receive the load applied from the external fastening device.

The fastening device located outside the enclosure consists of a fastening plate, a fastening rod, and a spring. The stack and the enclosure are protected by a separate case while maintaining an electrically insulated state. Since the conventional fastening device is installed inside the enclosure, the fastening device located outside the enclosure can be made of a low-cost material as compared with the point that an expensive nickel-based metal material should be used, high temperature tensile durability and high temperature corrosion resistance must be ensured The advantage of being able to maintain an appropriate load constantly with little deformation is emphasized, so that a separate device for adjusting the stress distribution of the stack can be attached or the cell box can be easily separated and replaced.

The fastening plate includes a total of seven load-applying rods and four fastening rods, and includes a fastening block including a thrust block having a structure for joining a load bar, and a spring connected to the fastening bar. At this time, the load-applying rods are pulled out from the outside of the enclosure, and are positioned in correspondence with the grooves on the four corners of the face plate. Therefore, the load applied from the external fastening device is applied to the four corners of the surface pressure plate, and the load is uniformly supplied to the cell box through the entire area of the surface pressure plate.

The enclosure is divided into a lamination part and a cover, and the lamination part is composed of a side base and a lower base in which a cell box is stacked. The laminated part is composed of a heat insulating material and a metal plate. A metal plate is installed to prevent particles of the heat insulating material from being deformed due to high temperature deformation of the heat insulating material, and the outside of the laminated part, do.

The side base exerts the heat inside the enclosure to the outside to function as insulation and support the electric insulation and surface pressure of the surface plate. In order to minimize the thickness shrinkage of the insulation due to the surface pressure, it is preferable to select a material having heat insulation and compression resistance. The lower base has an inlet and outlet flange of fuel and air supplied from the outside, a sensor cluster for measuring the temperature, voltage and pressure in the stack, and a connection terminal for connecting the power generated from the stack to the power processor.

In particular, the inlet and outlet flanges are coated with an insulating material such as alumina, and insulation gaskets are introduced to keep the external devices and the stack / module enclosures electrically isolated, thereby eliminating electrical disturbances. The lower base also includes a shelf capable of stacking cell boxes, which must meet the function of supporting the load of the stack while maintaining electrical insulation with the cell box. When the lamination part including the stack is completed, it is completed by tightening the lamination part and the vessel with a bolt-nut by covering the vessel which serves as a cover. In particular, a hot gasket is applied to the fastening portion for gas tightness.

The right-side lamination unit with the clamping unit has four load-applying rods that directly apply load to the surface pressure plate in the stack / module, three load-applying units for applying load to the anode gasket plate inlet / It has a total of seven loads, Gabon inlet, including Gabon, and the inlet includes a bellows that provides gas tightness and electrical isolation to prevent gas from escaping from the enclosure to the outside.

The fastening device consists of a total of seven load-applying rods, four fastening rods and fastening plates. The fastening plate includes a connecting block to which the load-applying rods are connected and a connecting rod connecting portion. Here, the fastening device is divided into an upper end portion and a lower end portion of the stack / module, and a portion where the load supporting rod and the fastening rod are present is a right fastening device located on the right side of the stacking portion. The left fastening device is composed of a clamping plate which supports the load and a clamping rod which is connected to the clamping rod. The four corner clamping rods have four compression springs acting as a constant load. Since the stack is manufactured in this structure, the stack, the enclosure, and the fastening device can be secured in an insulated state that is not electrically connected, and the power generated in the stack can be safely connected to the external power conversion device.

In a conventional high-temperature fuel cell, a hundred-kilowatt-class stack, an anode electrode and a cathode electrode are fabricated by sequentially stacking hundreds of bipolar plates and matrices attached to the upper and lower ends of the separator plate. However, when a cell is broken or a fatal defect is expected in a stack composed of hundreds of cells during operation, it is impossible to separate only the corresponding cell due to the structural characteristics of the separator plate. Therefore, An additional cost is excessively required from the viewpoint of operation maintenance, such as performing an operation of completely blocking the electrochemical reaction, and there is a limit in reducing the manufacturing cost due to the complication of many parts and electrode manufacturing processes.

On the contrary, the stack composed of the modularized 1kW cell box proposed in the present invention can be manufactured by welding the upper and lower portions of the anode plate with the same metal mold, thereby saving manufacturing cost, Since they are physically separated from each other, separation can be performed as needed, so that the operation cost is considerably lower than in the prior art in which the stack itself is replaced.

In addition, only the 1 kW cell box itself, which is impossible in the prior art, can be pre-processed, and only the number of replacement cells can be pretreated if necessary. Particularly, since the cell box proposed in the present invention is completed by integrating the housing stainless steel plate and the cathode anode plate constituting the cell box by using separate connecting bodies and forming the anode common plate and the electric circuit, It is possible to considerably reduce the contact resistance between the separator plate-current collector and the current collector-electrode, which is a technical difficulty, so that the power generation efficiency and the power generation efficiency can be expected as compared with the prior art.

In the stack / module manufactured by the prior art, since the surface pressure plate and the fastening device are installed inside to maintain a constant surface pressure, the tensile stress must be maintained at a high temperature, and the corrosion resistance required to withstand harsh corrosive environments Based alloy is used. On the contrary, since the stacking apparatus / module fastening apparatus proposed in the present invention exists outside the stack / module enclosure, not only low-cost materials having tensile strength and corrosion resistance against atmospheric corrosion can be used, It has the merit of being able to compensate for the downfall by adjusting only the bolt outside the module enclosure.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing an electric circuit of a stack assembly which is completed by stacking cell boxes made of a co-
2 is a schematic view for explaining a cell box constituting a stack proposed in the present invention,
3 is a schematic view showing an electrical connection of a cell box proposed in the present invention,
4 is a schematic view showing the structure of a stack and a module enclosure, and
5 is a schematic view showing a structure of a module including a stack made by stacking cell boxes, a fastening device, and a surface pressure device.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood, however, that the invention is not limited to the disclosed embodiments, but is capable of other various forms of implementation, and that these embodiments are provided so that this disclosure will be thorough and complete, It is provided to let you know completely. Wherein like reference numerals refer to like elements throughout.

It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected or connected to the other component, Quot; may be "connected," "coupled," or "connected. &Quot;

Hereinafter, a stack assembly in which a pressurizable high temperature type fuel cell unit cell is stacked according to the present invention will be described with reference to FIGS. 1 to 5. FIG.

FIG. 1 is a schematic view showing an electric circuit of a stack assembly, which is completed by stacking cell boxes made of a coin-shaped plate proposed in the present invention, in which a cell box 100 and an electric insulator 500 are sequentially stacked, The header of the box and the anode common plate is coupled at the cell box connection point 600 and connected to the bus bar 601 outside the stacked base of the stack / module enclosure to complete the circuit.

By constructing such an electrical circuit, a high temperature fuel cell stack / module having a power capacity of several tens kW to several hundred kW can be manufactured by increasing the number of cell boxes arranged in series.

 2 is a schematic view for explaining a cell box constituting a stack proposed in the present invention. The high temperature fuel cell stack 800 is sequentially stacked with the unit cell box 100 and the electric insulator 500. The cell box includes a cell enclosure 100 as a cathode, a cathode electrode 200, a cathode half-cathode plate 210, a cathode anode plate 220, a cathode connection terminal 225, an electrolyte-matrix 300, 400, and an anode coplanar plate 410.

In a cell box of the present invention, a high-temperature type fuel cell is provided with a cushioning balloons (hereinafter referred to as " cushion balloons ") capable of buffering the expansion and contraction 110).

The cathode anode plate 220 is a principle in which the cathode connection terminal 225 is welded to the cell box 100 so as to electrically connect the cell box 100, and as a result, the cell box becomes a cathode. The anode coils 410 must be physically non-contact with the cell box 100. On the other hand, an anode lead 407 as shown in FIG. 3 is connected to form one anode. Since the cell box of the present invention has a precondition that ion conduction between the anode and the cathode must be perfect, the electrolyte-matrix is formed between the anode common electrode plate 410 and the cathode common electrode plate 220, the anode common electrode plate 410, The plate 210 must be present.

2, an electrolyte for ion conduction must exist in a site physically contacting with the cell box 100. For this purpose, the electrolyte supplement 227 is provided on the cathode common electrode plate 220, (220).

As shown in FIG. 3, several anode copper plates existing in the cell box are connected to the anode holder 403, and are connected to the cathode connection terminal 225 of the cell box at the cell box connection point 600 .

The anode terminal 403 and the cathode connection terminal 225 of one cell box may be connected to the bus bar. When the cell boxes are stacked and stacked, the anode terminal 403 and the cathode connection terminal 225 of the first cell box may be stacked. Is connected to the cathode connection terminal of the second cell box is repeatedly connected to the bus bar.

In addition, two types of electrical insulators are provided to maintain the electrical insulation of the cell box: a header insulator 405 to induce electrical insulation between the anode and anode hoses, and a cell box electrical insulator (500). The header insulator 405 is made of a ceramic material that has solid ceramic and elasticity to hold both electrical insulation and gas sealing force, and a ceramic insulator that minimizes the frictional force to have resistance to thermal expansion of the cell box and the header, It has the ability to be.

In particular, the header insulator has a large difference in function from the manifold used in the prior art molten carbonate fuel cell and the insulator provided between the stack. That is, the insulator of the prior art does not allow the electrolyte wettability because an electric arc is generated and damages the stack when the electrolyte in direct contact moves into the insulator and becomes wet.

However, since the electric insulator proposed in the present invention does not have a liquid electrolyte, it has an advantage that a function can be given by a less expensive ceramic material. In addition, to increase the gas sealing force, the header insulator has a structure in which the gas-sealing force is increased by performing a process of setting the contact surface to be contacted with the header at a height difference. Cell box electrical insulators also require strength and electrical insulation to withstand compression forces. The thickness of the two types of insulators is preferably the same in view of the stress distribution of the stack so that a constant surface pressure load can be applied to the cell box and the header.

As shown in FIG. 4, the enclosure 700 is composed of laminate part bases 703 and 704, a front cover 701, and a rear cover 702. The left side face base of the lamination part is a starting point where the cell box is sequentially stacked after the surface pressure plate is installed and the lower base of the lamination part supports the cell box and the electric insulator, 600). A connection terminal block 601 is connected to the outer busbar of the cell box connection points to connect the external busbar to the external power conversion device. A sensor aggregation 705 is provided.

The stack / module enclosure proposed in the present invention is advantageous in that stacking is performed in a separate space to eliminate the inconvenience of installing the module in the module and the cell box can be stacked directly in the enclosure, And a fastening device is installed to apply a load to the cell box. Finally, after the electrical connection is completed, the cover is covered, and then it is combined with the bolt and the nut, It offers the advantage of significantly reducing the production process.

As shown in FIG. 5, the stack 800 is located inside the stack / module enclosure 700, and a constant load is applied by the surface pressure plate 900. The face plate load is provided by a fastening device provided outside the stack / module enclosure, and the face pushing rod 902 is connected to the fastening plate 901 and the spring bolt 905 so that the fastening force is supplied to the face pressing plate along the face pushing rod .

The fastening force of the fastening plate is formed as the fastening plate 901 located on the left and right of the stack / module enclosure is fixed by the fastening rod 903 and the bolts 904. The fastening plate 901 is mounted on the left and right enclosure banks of the stack / module to ensure ease of installation, and is installed in order to assemble the stack / module.

Here, it is preferable that the spring bolt 905 has a bellows type outline in order to simultaneously have a spring for maintaining surface pressure and a sealing function. On the other hand, the fastening device has a surface pushing rod 906 for applying a surface pressure to the anode inlet hole, an anode outlet bottom surface push rod 907, and a cathode outlet bottom surface push rod 908. They also have the same structure as the spring bolt 905 and must have a spring and sealing function.

On the other hand, on the left side base of the lamination portion of the stack / module enclosure in which the fastening plate is located, an inlet flange 909 and an outlet flange 910, a cathode inlet flange 911 and an outlet flange 912 for injecting fuel gas are provided. The point where the flange meets the stack / module enclosure should maintain the same sealing force as the spring bolt.

For this purpose, the gaskets and the bolt-nut fastening grooves are provided at both the point where the fastening plate meets and the point where the outer casing meets.

The cell box 100 using the co-current plate proposed in the present invention can produce a power of 1 kW through the generation of a voltage of less than 1 V and a current of 1000 A or more. The configuration of the cell box is preferably composed of three anode anode plates 410, two cathode anode plates 220, and a cathode half cathode plate 210.

However, when it is desired to increase the design power capacity of the unit cell box or to reduce the strategic capacity by reducing the area of the electrode reaction portion of the anode plate, the number of anode anode plates and cathode anode plates may be increased or decreased. As a practical example, a 1 kW class unit cell box of a molten carbonate fuel cell has three anode anode plates, two cathode anode plates, and two cathode anode plates with an apparent area of 1500 cm 2 of the anode and cathode on one anode plate And a total reaction area of 9000 cm 2 can be produced.

The upper and lower plates 210, 220 and 410 are manufactured and the inner supports 221 and 401, the plenums 223 and 403, the bellows 224 and 406, and the hiders 229 and 407 are manufactured do. Then, the anode anode plate is prepared by loading the reforming catalyst in accordance with the internal reforming ratio design of the manufactured inner support, then fixing the catalyst on the bottom plate, and then integrating the top plate and the bottom plate through laser welding.

The anode anode plate is completed by welding the plenum 403 and the bellows 406 to the integrated anode plate in this order. In order to lower the production cost, one mold is used for the anode plate, the plenum, ) One of the lower plates may be manufactured and welded.

The anode electrode is fabricated by directly coating the upper and lower anode portions of the anode using a transfer coating method or an arc plasma coating method. The anode material is a Ni-Cr-Al alloy powder that is commonly used in MCFC technology. It is coated with a porosity of 45% or more and a thickness of 0.1 mm or more as determined through experiments. Actually, an anode electrode using an arc plasma coating method has a plasma main voltage of 60 A or more and a separation distance between a plasma nozzle and an anode common electrode of 60 mm or more. However, rather than completely dissolving the raw material powder into plasma, And it was possible to secure a thickness of 0.1 mm or more and a porosity of 48% or more.

The cathode anode plate is subjected to the same manufacturing process as that of the anode anode plate. However, there is a difference between preparation of the inner support body 221 in which the electrolyte is loaded on the inner support body and preparation of the electrolyte supplementary sheet 228. In more detail, after the inner support 221 loaded with the electrolyte is fixed to the bottom plate of the cathode copper plate, the top plate is positioned thereon and integrated by laser welding. Then, the gas outlet side plenum 223 and the bellows 224 are sequentially welded. In the same way as the cathode anode plate, considering the reduction of the production cost, one metal mold can be manufactured and welded.

Next, the nickel powder or the nickel oxide powder is sequentially coated on the upper and lower reaction parts using the arc plasma coating method. In the electrode production using the arc plasma coating method and the nickel powder as raw materials, the thickness was 0.75 mm or more and the porosity was 78%. Thereafter, in order to secure the optimum power of the molten carbonate fuel cell, the necessary electrolyte is sequentially discharged to the cathode electrode 200 prepared by the arc plasma coating method located on the cathode active material plate and the bottom plate, It is manufactured by natural infiltration by the calculated amount.

The electrolyte applied to the cathode electrode is naturally permeated into the micropores by the capillary force and the gravity, and the suspension having the electrolyte particles smaller than the micropores must be used in order to proceed smoothly. The electrolyte impregnated amount of the cathode electrode thus fabricated can be impregnated into the cathode pores by 50 vol% or more.

A cathode half cathode plate is manufactured in the same manner and a drying process is performed to remove all the solvent of the applied electrolyte suspension. Drying is performed using a dry box that is shut off from the outside, and after the outside air is drawn into the drying box at a fixed temperature of 50 ° C or higher, the solvent is volatilized through the discharge to the outside. More preferably, a drying furnace capable of continuous drying is useful for mass production.

The dried cathode is again coated with Al ₂ O ₃ or LiAlO ₂ to form a matrix layer. For example, the matrix produced by the arc plasma coating method has a thickness of 0.4 t or more and a porosity of 45 vol%, preferably a plasma main power of 100 A or more, and a distance between the plasma torch and the cathode of 60 mm or more

As shown in FIG. 2, the manufactured anode and cathode anode plates are sequentially laminated in a cell box divided into a left side-right side portion, followed by a laser welding process. In order to improve the contact between the anode and the cathode electrode during stacking, the cell box applies a surface pressure of 6 kgf / cm 2 to the left and right.

In order to improve the electrical contact between the cathode anode plate and the cell box, the cathode connection terminal 225 is inserted into the cathode anode plate and the cell box, and is integrated by resistance welding or laser welding.

As shown in FIG. 3, three bellows of the anode current collector plate are integrally welded to the anode current collector to electrically integrate the anode current collector. To be more specific, the anode current collector is divided into two parts divided into left and right The left side that meets the bellows has 3 holes at the time of manufacture, and the bellows is inserted in the bellows, and the weld is integrated with the inside of the header, and the right side of the header is welded to the left side.

It can be seen that the three anode anode plates become anodes having the same polarity when manufactured in this way. The outlet bellows of the cathode cathode plate and the cathode cathode plate header are welded in the same process. The manufactured cell box is completed with stacks and modules by assembling various components described in the procedure as shown in Fig. In order to assure the seating of various components and the ease of stacking of the cell box, the stacking / module enclosure base portion is slantly fixed, the left surface pressure plate is firstly installed, and then the cell box 100 and the cathode (anode) The assembled assembly and the electrical insulator must be stacked.

The stacking method of the present invention stacks a cell box directly on a stack / module enclosure. The stack is stacked on a lower base of the enclosure, covered with a vessel, and welded .

When the lamination is completed, the right side pressing plate is installed, and the left and right side pressing sticks 902 are inserted. Then, the spring bolts 905 are installed, and the connecting plate 901 and the connecting rod 903 are positioned. Thereafter, the bolts 904 of the connecting portion connecting the connecting rod 903 and the connecting plate 901 are firstly fastened, and the surface pushing rod 902 and the header surface pushing rods 906, 907 and 908 are fastened together. Thereafter, a hydraulic press is connected to eleven bolts to gradually apply a pressure equivalent to about 6 kgf / cm 2 to move the position of the bolt.

When these components are assembled according to this fastening procedure, the mechanical connection of the stack / module is completed.

Then, as shown in FIG. 4, a cold electric power line is connected and fixed between the cell box having the cathode polarity and the anode header, and finally, the electric wire is firmly coupled to the bus bar connection terminal 601. When the mechanical and electrical connection work according to this procedure is completed, the rear cover 702 of the stack / module enclosure is coupled with the enclosure 700 by bolts and nuts, and the front cover is then successively The high temperature fuel cell stack / module is completed.

As described above, according to the present invention, a stack composed of a modularized 1 kW cell box can be manufactured by welding the upper and lower portions of the same plate with the same metal mold, thereby saving manufacturing costs, and the cell box and the cell box can be electrically and physically So that it is possible to separate it according to need, and the operation cost is considerably lower than that of the prior art in which the stack itself is exchanged.

It is to be understood that the terms "comprises", "comprising", or "having" as used in the foregoing description mean that the constituent element can be implanted unless specifically stated to the contrary, But should be construed as further including other elements. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Commonly used terms, such as predefined terms, should be interpreted to be consistent with the contextual meanings of the related art, and are not to be construed as ideal or overly formal, unless expressly defined to the contrary.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

Claims (10)

A plurality of cathode common plates arranged to be electrically integrated with the cell box in the cell box, a plurality of cathode common plates disposed in the cell box between the plurality of cathode common plates, An electrolyte matrix having a structure that surrounds the anode common electrode and the cathode common electrode so as to physically separate the plurality of anode common electrode plates and the plurality of cathode common electrode plates, the plurality of anode common electrode plates, A plurality of fuel cell unit cells including a cathode electrode disposed between the electrolyte matrices and an anode electrode disposed between the plurality of anode common plates and the electrolyte matrix;
A cell box electrical insulator disposed between the cell boxes constituting the plurality of fuel cell unit cells to induce electrical insulation; And
And a header insulator disposed between the anode headers connected to the anode common electrode to induce electrical insulation,
Wherein the anode header and the cell box are joined at a cell box connection point,
Wherein the plurality of cell boxes and the plurality of anode heads are sequentially stacked to form a stack,
A stack assembly in which a pressurizable high temperature type fuel cell unit cell is stacked.
The method according to claim 1,
Wherein when the anode header is sequentially stacked with the header insulator, each of the cell boxes becomes completely electrically insulated, and when the cell boxes having the anode header and the cathode polarity are sequentially connected in series, Of the cell box is completed,
The cell box electrical insulator having an insulation and buffer function and being mechanically separable from the cell box to enable replacement of the cell box,
A stack assembly in which a pressurizable high temperature type fuel cell unit cell is stacked.
The method according to claim 1,
The cell box includes:
Which constitutes a buffering bellows that can buffer the expansion and contraction occurring during the operation process,
A stack assembly in which a pressurizable high temperature type fuel cell unit cell is stacked.
The method according to claim 1,
On a stack assembly on which a plurality of unit cells are stacked,
Wherein an anode header of a cell box disposed at the uppermost stage and a cathode connection terminal of a cell box disposed at the lowermost stage are connected to a bus bar,
A stack assembly in which a pressurizable high temperature type fuel cell unit cell is stacked.
The method according to claim 1,
A stack enclosure for receiving the stack therein;
A surface pressure plate disposed on upper and lower sides of the stack in the stack enclosure; And
And a fastening module for applying a load on the surface pressure plate through the stack enclosure.
A stack assembly in which a pressurizable high temperature type fuel cell unit cell is stacked.
6. The method of claim 5,
The fastening module includes:
A pressing rod connected to the surface pressure plate through the fixing plate, and a pressing rod connected between the outer surface of the stack casing and the inner surface of the fixing plate, Comprising a spring disposed therein,
A stack assembly in which a pressurizable high temperature type fuel cell unit cell is stacked.
The method according to claim 6,
Wherein the clamping rod connects the clamping plate facing the outer side of the stack enclosure and the spring is arranged to penetrate the clamping plate on the clamping rod and applies a constant load to the clamping plate from the clamping plate,
A stack assembly in which a pressurizable high temperature type fuel cell unit cell is stacked.
8. The method of claim 7,
Wherein a seating groove having a predetermined shape is formed on the surface pressing plate for contact with the surface pressing bar,
A stack assembly in which a pressurizable high temperature type fuel cell unit cell is stacked.
6. The method of claim 5,
The stack enclosure,
An enclosure body having both side open sides, a lamination part disposed inside the enclosure body, and a cover for closing both open sides of the enclosure body,
Wherein the stacking portion includes a side base for performing an insulating function for discharging the heat inside the stack enclosure to the outside and a function for supporting electrical insulation and surface pressure of the surface pressure plate and a lower base on which the stack is placed,
A stack assembly in which a pressurizable high temperature type fuel cell unit cell is stacked.
10. The method of claim 9,
The lower base includes:
An inlet and outlet flange of fuel and air supplied from the outside, a sensor assembly for measuring temperature, voltage, and pressure in the stack, and a connection terminal block for connecting the power generated in the stack to an external power processing device. A stack assembly in which fuel cell unit cells are stacked.

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