CN115882001A - Stack tower and fuel cell - Google Patents

Abstract

The invention discloses a stack tower and a fuel cell, wherein the stack tower comprises: a stack (100) having an anode gas port formed therein; a lower mica sheet (200) located below the stack (100); the gas distribution plate (300) is positioned below the lower mica sheet (200) and is provided with an anode sealing convex ring (400) protruding upwards; the anode sealing convex ring (400) penetrates through the lower mica sheet (200) and is inserted into the anode gas port, so that the anode gas port is radially sealed. Insert in the anode gas mouth and form the annular seal face through the sealed bulge loop of positive pole for the gaseous unable radial outward diffusion of positive pole realizes the one-level of this pile sealed, and is nested in the outside of the sealed bulge loop of positive pole through the sealing layer, forms the second grade and seals, guarantees that inside anode gas can not reveal to the pile outside, and the leakproofness of pile positive pole is good, has improved fuel utilization and generating efficiency, has guaranteed fuel cell's stability and security.

Description

Stack tower and fuel cell

Technical Field

The invention belongs to the technical field of fuel cell power generation, and particularly relates to a stack tower and a fuel cell.

Background

The solid oxide fuel cell consists of an anode, a cathode and an electrolyte, wherein the anode is fuel gas, and the cathode is air or oxidizing gas containing air. The anode fuel gas is mostly supplied by a pipeline or a gas distribution plate, and the cathode gas is mostly in an open gas distribution mode. Because the direct welding between the pipeline and the electric pile easily deforms the bottom plate of the electric pile, and the deformation can destroy the sealing relation between the battery pieces due to the stress generated by the deformation at high temperature. So that the cathode gas can leak to the anode and oxidize the anode fuel gas. Therefore, ensuring the tightness of the anode of the galvanic pile is particularly important for a single-pile test system or a pile tower.

Although the solid oxide fuel cell is usually provided with a mica gasket at the interface between the pipeline or the gas distribution plate and the bottom plate of the stack and coated with the high-temperature glue, the sealing condition can be improved to a certain extent, but in practical application, the sealing effect is not ideal due to the migration of the high-temperature glue at different temperatures, and the stability of the power generation performance and the accuracy of the test are affected.

Disclosure of Invention

In view of the above-mentioned drawbacks or deficiencies of the prior art, the present invention provides a stack tower and a fuel cell, wherein the stack tower has good anode sealing performance, improves fuel utilization and power generation efficiency, and ensures the stability and safety of the fuel cell.

To achieve the above object, according to one aspect of the present invention, there is provided a stack tower including:

a stack having an anode gas port formed therein;

the lower mica sheet is positioned below the galvanic pile;

the gas distribution plate is positioned below the lower mica sheet and is provided with an anode sealing convex ring which protrudes upwards;

the anode sealing convex ring penetrates through the lower mica sheet and is inserted into the anode air port so as to enable the anode air port to be sealed in the radial direction, sealing layers attached to the lower mica sheet are respectively arranged on at least part of wall surfaces of the galvanic pile and the air distribution plate, and the sealing layers are arranged outside the anode sealing convex ring in a surrounding mode.

In some embodiments, the anode sealing convex ring is annular and comprises a sealing ring gasket arranged along the height direction of the galvanic pile and an insulating boss for supporting the sealing ring gasket, and the outer peripheral wall surface of the sealing ring gasket is in sealing fit with the inner peripheral wall surface of the anode gas port.

In some embodiments, the gas distribution plate comprises a substrate, and an anode inlet branch channel and an anode outlet branch channel which are arranged on the substrate at intervals, wherein the anode inlet branch channel is used for accommodating an anode inlet branch pipe of the electric pile, and the anode outlet branch channel is used for accommodating an anode outlet branch pipe of the electric pile.

In some embodiments, the insulation boss is located on the substrate, and the gas outlet end of the anode gas inlet branch pipe and the gas inlet end of the anode gas outlet branch pipe respectively penetrate through the insulation boss and extend into the sealing ring gasket, and the sealing ring gasket radially seals the anode gas inlet branch pipe and the anode gas outlet branch pipe; or, the gas outlet end of the anode gas inlet branch pipe and the gas inlet end of the anode gas outlet branch pipe are both formed into a stepped pipe part, the stepped pipe part comprises an integrally connected insulating boss on the substrate and a gas outlet pipe section extending into the sealing ring gasket, and the sealing ring gasket enables the anode gas inlet branch pipe and the anode gas outlet branch pipe to be radially sealed.

In some embodiments, the seal ring gasket is an octagonal metal ring gasket; and/or the insulation boss is a high-temperature-resistant insulation structural part.

In some embodiments, the lower mica sheet includes a mica end face disposed opposite the stack or the gas distribution plate, and the sealing layer is disposed in a closed surrounding arrangement along an outer periphery of the mica end face.

In some embodiments, the sealing layer is a high temperature glue.

In some embodiments, the stack tower comprises one said stack; or, the pile tower comprises a plurality of piles arranged along the pile height direction.

In some embodiments, the stack tower further comprises a fastening assembly for fastening the stack, the fastening assembly comprising:

the gas distribution plate comprises a gas distribution plate, wherein support lugs are symmetrically arranged on the peripheral wall surface of the gas distribution plate, an upper mica sheet is arranged above the galvanic pile, a galvanic pile pressing plate is arranged on the upper mica sheet at the top in the pile height direction, and the spring is arranged between each support lug and the galvanic pile pressing plate in a penetrating manner; and

the fixing bases are sleeved on the springs, the support lugs and the pile pressing plates are located between the fixing bases.

In some embodiments, the spring force of the spring decreases from top to bottom in the stacking direction.

In some embodiments, the stack tower further includes an anode inlet main pipe segment and an anode outlet main pipe segment, and the anode inlet branch pipe and the anode outlet branch pipe are respectively connected to the anode inlet main pipe segment and the anode outlet main pipe segment in a bypassing manner.

In some embodiments, in the stacking direction, adjacent anode gas inlet main segments and adjacent anode gas outlet main segments are connected through corrugated pipes.

In addition, the invention also provides a fuel cell, which comprises the stack tower.

In the pile tower and the fuel cell of the invention, the anode sealing convex ring is inserted into the anode gas port and forms an annular sealing surface, so that the anode gas can not be diffused outwards in the radial direction, the primary sealing of the pile is realized, and the sealing layer is nested outside the anode sealing convex ring to form secondary sealing, thus ensuring that the anode gas inside the pile can not leak to the outside of the pile, avoiding the cathode gas outside from entering the gas distribution plate to oxidize the anode gas, having good sealing performance of the pile anode, improving the fuel utilization rate and the power generation efficiency, and ensuring the stability and the safety of the fuel cell.

Additional features and advantages of the invention will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic view of a stack tower according to an embodiment of the present invention;

FIG. 2 is a split view of FIG. 1 showing the gas distribution plate, the upper mica sheet, the stack, the lower mica sheet, and the gas distribution plate from top to bottom;

FIG. 3 is a partial schematic structural view of FIG. 2, showing the lower mica sheet and the gas distribution plate;

FIG. 4 is a schematic partial structural view of FIG. 2 showing the upper mica sheets, the stack, the lower mica sheets and the gas distribution plate;

FIG. 5 is a partial schematic structural view of FIG. 1, showing the lower mica sheet and the sealing layer; and

fig. 6 is a schematic structural view of a stack tower according to an embodiment of the present invention, showing a stack tower structure having one stack.

Description of reference numerals:

100. mica sheet under 200 electric pile

300. Gas distribution plate 400 anode sealing convex ring

500. Sealing layer

410. Sealing ring gasket 420 insulation boss

310. Substrate 320 anode gas inlet branch channel

330. Anode gas outlet branch channel

1. Spring 2 support lug

3. Go up 4 electric pile clamp plates of mica sheet

5. Anode air inlet main pipe section 6 anode air outlet main pipe section

7. Corrugated pipe 8 ceramic ring

9. Anode gas inlet branch pipe extension seat 10 anode gas outlet branch pipe extension seat

11. Air inlet mica hole 12 air outlet mica hole

13. Spring hole 14 fixing seat

H stacking direction

Detailed Description

The following describes in detail embodiments of the present invention with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

In the present invention, unless specified to the contrary, use of the terms "upper, lower, top and bottom" in the orientation illustrated in the drawings generally refers to the orientation of the components as shown in the drawings or to the orientation of the components relative to each other in the vertical, vertical or gravitational direction.

According to the fuel cell and the stack tower, the sealing performance of the anode of the stack in the stack tower is good, the fuel utilization rate and the power generation efficiency are improved, and the stability and the safety of the fuel cell are ensured. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

The solid oxide fuel cell has the characteristics of high chemical energy efficiency and environmental friendliness, so that the solid oxide fuel cell has wide application prospect, and for a small solid oxide fuel cell testing system or a KW-level electric pile power generation system, the bottom plate of the electric pile is easy to deform due to direct welding between a pipeline and the electric pile, and the sealing relation between cell pieces can be damaged due to the stress generated by the deformation at high temperature. So that the cathode gas can leak to the anode and oxidize the anode fuel gas. Therefore, it is important to ensure the sealing performance of the anode of the stack.

In the system, the anode adopts a pipeline for ventilation, the cathode adopts an open ventilation mode, and the sealing performance of the stack pushing tower mainly depends on two factors, wherein one factor is a sealing structure, and the other factor is the pressing force between the stacks. In order to avoid anodic oxidation caused by leakage of cathode gas to the anode, the anode of the stack tower is designed to have sealing performance. The invention provides a galvanic pile unit with a brand-new structure. Referring to the specific embodiments of fig. 1-6, a stack tower, in one aspect, includes: the electric pile 100, the lower mica sheet 200 and the gas distribution plate 300;

specifically, the stack 100, which forms an anode gas port, is a core element of the solid oxide fuel cell, and the stack 100 is used for converting chemical energy into electric energy;

the lower mica sheet 200 is positioned below the galvanic pile 100, and the lower mica sheet 200 has the functions of insulation and low-loss thermal resistance, can block heat transfer among the galvanic piles 100 and reduces the problem of tightness caused by stress generated by high temperature;

the gas distribution plate 300 is positioned below the lower mica sheet 200 and is provided with an anode sealing convex ring 400 protruding upwards, the gas distribution plate 300 is attached to the lower mica sheet 200, gas distribution is carried out on the stack 100 through the gas distribution plate 300, and anode gas flows in the anode sealing convex ring 400;

the anode sealing convex ring 400 penetrates through the lower mica sheet 200 and is inserted into an anode gas port, so that the anode gas port is radially sealed, at least part of wall surfaces of the galvanic pile 100 and the gas distribution plate 300 are respectively provided with a sealing layer 500 which is attached to the lower mica sheet 200, and the sealing layer 500 is arranged around the outside of the anode sealing convex ring 400, so that the problem that gas is easy to leak at a pipeline interface is solved, the anode sealing convex ring 400 is inserted into the anode gas port to form an attaching surface, the attaching surface enables the anode sealing convex ring 400 and the anode gas port to be in a sealing relation, namely, only an axial ventilation flow channel exists between the anode sealing convex ring 400 and the anode gas port, and a radial ventilation flow channel does not exist, so that anode gas cannot leak along the anode gas port, and the tightness of the anode gas is ensured. While the sealing layer 500 surrounds the outside of the anode sealing protrusion ring 400, thus forming a double sealing structure to further prevent leakage of the anode gas at the outside of the anode sealing protrusion ring 400.

Alternatively, for the stack 100, in the solid oxide fuel cell, there may be a plurality of stacks 100, and the plurality of stacks 100 are stacked on each other to form a stack tower. The electric pile 100 comprises a plurality of stacked battery pieces, an upper pile plate positioned at the top of the battery pieces and a lower pile plate positioned at the bottom of the battery pieces, wherein an anode gas port for ventilation is formed on the lower pile plate, and the anode gas port comprises an electric pile anode gas inlet for introducing anode gas and an electric pile anode gas outlet for leading out the anode gas, so that the anode gas inlet and the anode gas outlet can smoothly flow, and the number of the electric piles 100 and the size and the shape of the anode gas port can be various and are not particularly limited.

Optionally, the lower mica sheet 200 may be a sheet structure, the shape of the lower mica sheet may be a rectangle adapted to the stack 100 to improve the integration and regularity of the stack tower, or a circle convenient to process, and the thickness of the lower mica sheet 200 may be 1mm to 2mm to play an insulating role. In addition, the two-piece structure can be integrated or split-jointed, and is not limited in particular.

Optionally, the gas distribution plate 300 may have a plate-shaped structure with an anode gas distribution groove, and at this time, the anode gas inlet and the anode gas outlet are separated from each other, so that the upper wall surface of the gas distribution plate 300 may be planar, the distance between the lower mica sheet 200 and the gas distribution plate 300 is reduced, the thickness of the sealing layer 500 is reduced, and the cost is saved; the gas distribution plate 300 may also be a box-shaped plate body having an inner cavity structure, and a partition plate is provided inside the box-shaped plate body to separate the anode inlet gas and the anode outlet gas.

Optionally, the anode sealing protruding ring 400 may be a split structure, and the anode sealing protruding ring 400 may be directly and fixedly mounted on the gas distribution plate 300, and may be embedded in the gas distribution plate 300, which is not limited herein.

In order to improve the sealing performance between the anode sealing protruding ring 400 and the anode gas port, in one embodiment, the anode sealing protruding ring 400 is annular and includes a sealing ring gasket 410 disposed along the stack height direction H of the stack 100 and an insulating boss 420 for supporting the sealing ring gasket 410, and an outer circumferential wall surface of the sealing ring gasket 410 is in sealing engagement with an inner circumferential wall surface of the anode gas port, as shown in fig. 2 and 3. The anode sealing convex ring 400 is a split structure, the insulating bosses 420 sleeved on the anode gas branch pipe can be fixedly installed on the gas distribution plate 300 or stacked on the gas distribution plate 300, the sealing ring gasket 410 is supported by the insulating bosses 420, and the insulating bosses 420 are clamped between the sealing ring gasket 410 and the gas distribution plate 300 to perform an insulating function.

The installation mode between the insulation boss 420 and the sealing ring gasket 410, and the installation mode between the insulation boss 420 and the sealing ring gasket 410 may be a groove block, for example, a boss groove body may be formed on the upper surface of the insulation boss 420, and the lower end of the sealing ring gasket 410 may be embedded in the boss groove body, so that not only the supporting force for the sealing ring gasket 410 may be ensured, but also the sealing property between the insulation boss 420 and the sealing ring gasket 410 may be improved. Be formed with on the lower mica sheet 200 and be used for inserting the inlet mica hole 11 and the outlet mica hole 12 of seal ring pad 410, the upper end of seal ring pad 410 passes inlet mica hole 11 or the outlet mica hole 12 inserts in the anode gas mouth, such grafting relation, make the outer peripheral wall face of seal ring pad 410 can laminate mutually with the inner peripheral wall face of anode gas mouth, and form annular seal face, this annular seal face parcel is in the gaseous outside of anode, make the gaseous unable radial outdiffusion of anode, thereby realize the one-level of this pile 100 and seal.

The anode gas is more uniformly and stably introduced into the cell stack 100 through the gas distribution plate 300, in an embodiment, the gas distribution plate 300 includes a substrate 310, and an anode gas inlet branch channel 320 and an anode gas outlet branch channel 330 which are arranged on the substrate 310 at intervals, the anode gas inlet branch channel 320 is used for accommodating an anode gas inlet branch of the cell stack 100, and the anode gas outlet branch channel 330 is used for accommodating an anode gas outlet branch of the cell stack 100, as shown in fig. 3 and fig. 4. At least two mutually spaced open slots can be set up on the face of gas distribution plate 300, one of them is the positive pole that can place the positive pole inlet branch pipe and admits air a passageway 320, its two are the positive pole that can place the positive pole outlet branch pipe and give vent to anger a passageway 330, thus, both make things convenient for the installation gas distribution of positive pole inlet branch pipe and positive pole outlet branch pipe, make the upper surface of gas distribution plate 300 again be planar, avoid producing the gas distribution plate 300 atress uneven that causes because of positive pole inlet branch pipe and positive pole outlet branch pipe protrusion, effectively protect positive pole inlet branch pipe and positive pole outlet branch pipe.

For the anode inlet pipe and the anode outlet pipe, in one embodiment, the insulation boss 420 is located on the substrate 310, the outlet end of the anode inlet branch pipe and the inlet end of the anode outlet branch pipe respectively penetrate through the insulation boss 420 and extend into the sealing ring gasket 410, and the sealing ring gasket 410 seals the anode inlet branch pipe and the anode outlet branch pipe radially. And the anode gas inlet pipe and the anode gas outlet pipe can be in an L shape, namely, the anode gas inlet pipe and the anode gas outlet pipe comprise an anode gas transverse pipe section positioned in the gas distribution plate 300 and an anode gas vertical pipe section protruding upwards, the insulating boss 420 can be fixedly sleeved on the anode gas vertical pipe section, namely, the insulating boss 420 and the anode gas vertical pipe section are in a split structure, and the port of the anode gas vertical pipe section can be 2-3 mm higher than the plane of the substrate 310 and positioned in the sealing ring gasket 410, so that an annular sealing surface is formed between the port of the anode gas vertical pipe section and the sealing ring gasket 410, and gas leakage is further reduced.

In another embodiment, the gas outlet end of the anode gas inlet branch pipe and the gas inlet end of the anode gas outlet branch pipe are both formed as a stepped pipe portion, the stepped pipe portion includes an integrally connected insulating boss 420 on the substrate 310 and a gas outlet pipe portion extending into the sealing ring gasket 410, and the sealing ring gasket 410 seals the anode gas inlet branch pipe and the anode gas outlet branch pipe in a radial direction. The diameter of insulating boss 420 is greater than the diameter of the pipe section of giving vent to anger, in order to form the echelonment structure, anode intake pipe and anode outlet pipe can be the L form, including the horizontal pipe section of the gaseous positive pole that is located gas distribution plate 300 and the gaseous vertical pipe section of bellied positive pole that makes progress, can understand, insulating boss 420 and the gaseous vertical pipe section structure as an organic whole of positive pole this moment, the pipe section of giving vent to anger as the gaseous vertical pipe section opening end of positive pole can be higher than base plate 310 plane 2-3 millimeters and lie in seal ring pad 410, like this, make and form annular sealing face between the port of the gaseous vertical pipe section of positive pole and the seal ring pad 410, further reduce gas leakage.

Further to the structure of the seal ring gasket 410, in one embodiment, the seal ring gasket 410 is an octagonal metal ring gasket; and/or the insulation boss 420 is a high temperature resistant insulation structure. On one hand, as shown in fig. 2 and fig. 3, the octagonal metal ring gasket is a solid metal gasket with an octagonal cross section, which is made of metal materials through forging, heat treatment and machining, is used under the working condition of temperature fluctuation, has the radial self-tightening sealing effect, and can resist high temperature and high pressure, and the sealing is durable and reliable. On the other hand, since the operating temperature of the fuel cell can reach as high as 600 to 800 ℃, and an insulation treatment needs to be performed between the seal ring gasket 410 and the gas distribution plate 300, so that the insulation boss 420 needs to have dual characteristics of high temperature resistance and insulation, the insulation boss 420 may be made of a high temperature resistant mica material, a ceramic material, or a vermiculite material, such as a mica ring, which is not specifically limited herein.

In order to improve the sealing of the respective layers of the support, in one embodiment, the lower mica sheet 200 includes a mica end surface disposed opposite to the stack 100 or the gas distribution plate 300, and the sealing layer 500 is disposed in a closed surrounding arrangement along an outer periphery of the mica end surface, as shown in fig. 1 and 5. The sealing layer 500 is closed, can be rectangular or annular, wherein the lower mica sheet 200 can form a distance of 1-2 mm with the galvanic pile 100 or the gas distribution plate 300 for coating the sealing layer 500, the sealing layer 500 is nested outside the anode sealing convex ring 400 to form a secondary seal, so that anode gas in the sealing layer can not be leaked to the outside of the galvanic pile 100, and the external cathode gas can be prevented from entering the gas distribution plate 300 to oxidize the anode gas, thereby improving the fuel utilization rate and the power generation efficiency.

Since the stack 100 is in a high temperature state in an operating state, the sealing layer 500 is a high temperature glue in one embodiment. The temperature resistance of the high-temperature adhesive can be from 200 ℃ to 1800 ℃, good bonding performance and corrosion resistance can be kept at high temperature, and the high-temperature adhesive is convenient to use and long in service life.

In order to improve the applicability of the sealed electric pile, in an embodiment, the electric pile tower comprises an electric pile 100, as shown in fig. 4 and fig. 6, the single electric pile 100 can be used for a small-sized solid oxide fuel cell testing system, the airtightness of anode gas can be ensured, and support guarantee can be provided for the testing system to obtain more accurate data; or, in an embodiment, the stack tower includes a plurality of stacks 100 arranged along the stack height direction H, and can be used in a KW-class stack power generation system, so as to ensure the airtightness of the anode gas, and ensure the safety of the stacks 100 and the stability of the power generation performance. In addition, each cell stack 100, the lower mica sheet 200 and the gas distribution plate 300 at the bottom, and the upper mica sheet 3 at the top form a unit body, and a plurality of unit bodies are stacked to form a cell stack tower of the multi-cell stack 100.

On the other hand, when the stack tower operates, due to a high-temperature environment, the stack 100 expands, the stack 100 on the lower floor has a larger pressure bearing and is restrained from expanding to a certain extent, while the stack 100 on the upper floor has a much smaller pressure bearing than the stack 100 on the lower floor and is obviously expanded, and in an expanded state, the sealing effect between the stacks 100 inevitably changes, so that anode gas has a risk of leakage.

Thus, in one implementation, the stack tower further includes a fastening assembly for fastening the stack 100, the fastening assembly including: the gas distribution plate comprises springs 1, wherein support lugs 2 are symmetrically arranged on the peripheral wall surface of the gas distribution plate 300, an upper mica sheet 3 is arranged above a galvanic pile 100, a galvanic pile pressing plate 4 is arranged on the upper mica sheet 3 at the top in the pile height direction H, and the springs 1 are arranged between each support lug 2 and the galvanic pile pressing plate 4 in a penetrating manner; and fixing base 14, all overlap on every spring 1 and be equipped with two fixing bases 14, journal stirrup 2 and galvanic pile clamp plate 4 all are located between two fixing bases 14. As shown in fig. 2 and fig. 6, the support lug 2 of the gas distribution plate 300 is provided with a spring hole 13, the spring 1 penetrates through the spring hole 13, the cell stack pressure plate 4 of the cell stack tower is connected with each gas distribution plate 300 through the spring 1, and a certain pretightening force is given to the cell stack 100 during high-temperature expansion, so that the expansion amount of the upper cell stack is reduced, the sealing effect between the cell stacks is ensured to a certain extent, and the springs 1 are symmetrically arranged on two sides of the cell stack 100, so that the acting force acting on the cell stack 100 is more balanced. The fixing seat 14 is arranged on the upper portion of the stack pressing plate 4 and the lower portion of the gas distribution plate 300 at the bottom, a gap is formed between the fixing seat 14 and the stack pressing plate 4 and the gas distribution plate 300, the stack pressing plate 4 and the gas distribution plate 300 can be limited to a certain extent through the fixing seat 14, and the stack pressing plate and the gas distribution plate 300 are prevented from falling off from the spring 1.

Further, in the stack tower of the multi-stack 100, the more the upper stack 100 is likely to leak, the less the probability of the lower stack 100 to leak is, mainly because the lower stack 100 is higher for the same stack 100, and the upper stack 100 may exceed the mechanical strength that the lower stack 100 can bear if the same stack 100 is applied. In order to reduce the difference in pressing force between the respective stacks 100, in one embodiment, the elastic force of the spring 1 is gradually reduced from top to bottom in the stack height direction H. The elasticity of the upper end of the spring 1 is relatively larger, and the elasticity of the lower end of the spring 1 is relatively smaller, so that the pressing force among the electric piles 100 is closer, the sealing workers among the electric piles 100 are closer, and the distribution of the anode gas is more uniform.

For the anode gas transmission pipeline, in an embodiment, the stack tower further includes an anode gas inlet main pipe segment 5 and an anode gas outlet main pipe segment 6, and the anode gas inlet branch pipe and the anode gas outlet branch pipe are respectively connected to the anode gas inlet main pipe segment 5 and the anode gas outlet main pipe segment 6, as shown in fig. 1 and 3. An anode inlet branch pipe extension seat 9 and an anode outlet branch pipe extension seat 10 are arranged on the gas distribution plate 300, the anode inlet branch pipe is positioned in the anode inlet branch pipe extension seat 9 and communicated with the anode inlet main pipe section 5, and the anode outlet branch pipe is positioned in the anode outlet branch pipe extension seat 10 and communicated with the anode outlet main pipe section 6.

Further, in an embodiment, in the stack height direction H, the adjacent anode gas inlet main pipe segments 5 and the adjacent anode gas outlet main pipe segments 6 are connected through the corrugated pipes 7, the anode gas inlet main pipe segment 5 and the anode gas outlet main pipe segment 6 of each stack 100 are communicated through the corrugated pipes 7 to form an anode gas main pipe which is located outside the stack and extends along the stack height direction H, the corrugated pipes 7 can buffer the pipeline expansion gas passage at high temperature, the anode gas inlet main pipe segment 5 is taken as an example, two or more corrugated pipes 7 can be arranged between the adjacent anode gas inlet main pipe segments 5, and the adjacent corrugated pipes 7 can be insulated by the ceramic ring 8 between the corrugated pipes 7 and can radially seal the corrugated pipes 7.

In addition, the invention also provides a fuel cell, the fuel cell comprises the stack tower, the fuel cell can be a small solid oxide fuel cell testing system and also can be a KW-level stack power generation system, on one hand, the sealing ring gasket 410 is inserted into the anode gas port and forms an annular sealing surface, so that the anode gas cannot be diffused outwards in the radial direction, primary sealing of the stack 100 is realized, the sealing layer 500 is nested outside the anode sealing convex ring 400 to form secondary sealing, and therefore, the anode gas in the stack 100 cannot be leaked to the outside, the cathode gas outside is prevented from entering the gas distribution plate 300 to oxidize the anode gas, and the fuel utilization rate and the power generation efficiency are improved. On the other hand, a pretightening force is provided for the galvanic pile 100 through the spring, the expansion amount of the upper galvanic pile 100 is reduced, and the sealing effect among the galvanic piles is further ensured.

In conclusion, the fuel cell stack tower and the fuel cell stack anode have good sealing performance, and the fuel utilization rate and the power generation efficiency are improved, so that the stability and the safety of the fuel cell are ensured.

It should be noted that other configurations and functions of the stack tower and the fuel cell according to the embodiment of the present invention are known to those skilled in the art, and are not described herein in detail to reduce redundancy.

The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications, such as changes in the shape, thickness and material of the end plate sealing layer, may be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the scope of the present invention.

Furthermore, it should be noted that in the description of the present specification, reference to the description of "one embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. In other cases, the combination may be performed in any suitable manner, and the invention will not be described in detail in order to avoid unnecessary repetition.

In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.

Claims (13)

1. A stack tower, comprising:

a stack (100) having an anode gas port formed therein;

a lower mica sheet (200) located below the stack (100);

the gas distribution plate (300) is positioned below the lower mica sheet (200) and is provided with an anode sealing convex ring (400) which protrudes upwards;

the anode sealing convex ring (400) penetrates through the lower mica sheet (200) and is inserted into the anode gas port so as to enable the anode gas port to be sealed in the radial direction, sealing layers (500) attached to the lower mica sheet (200) are respectively arranged on at least partial wall surfaces of the stack (100) and the gas distribution plate (300), and the sealing layers (500) are arranged outside the anode sealing convex ring (400) in a surrounding mode.

2. The stack tower according to claim 1, wherein the anode sealing convex ring (400) is annular and comprises a sealing ring gasket (410) arranged along the stack height direction (H) of the stack (100) and an insulating boss (420) used for supporting the sealing ring gasket (410), and the outer peripheral wall surface of the sealing ring gasket (410) is in sealing fit with the inner peripheral wall surface of the anode gas port.

3. The stack tower according to claim 2, wherein the gas distribution plate (300) comprises a base plate (310), and an anode inlet branch channel (320) and an anode outlet branch channel (330) which are arranged on the base plate (310) at intervals, the anode inlet branch channel (320) is used for accommodating an anode inlet branch pipe of the stack (100), and the anode outlet branch channel (330) is used for accommodating an anode outlet branch pipe of the stack (100).

4. The stack tower of claim 3, wherein the insulation boss (420) is located on the base plate (310), the outlet end of the anode inlet branch pipe and the inlet end of the anode outlet branch pipe respectively penetrate through the insulation boss (420) and extend into the sealing ring gasket (410), and the sealing ring gasket (410) seals the anode inlet branch pipe and the anode outlet branch pipe in a radial direction; or, the gas outlet end of the anode gas inlet branch pipe and the gas inlet end of the anode gas outlet branch pipe are both formed into a stepped pipe part, the stepped pipe part comprises an integrally connected insulating boss (420) positioned on the substrate (310) and a gas outlet pipe section extending into the sealing ring gasket (410), and the sealing ring gasket (410) enables the anode gas inlet branch pipe and the anode gas outlet branch pipe to be radially sealed.

5. The stack tower according to claim 2, wherein the seal ring gasket (410) is an octagonal metal ring gasket; and/or the insulation boss (420) is a high-temperature-resistant insulation structural member.

6. The stack tower according to any one of claims 1 to 5, wherein the lower mica sheet (200) comprises a mica end face disposed opposite to the stack (100) or the gas distribution plate (300), and the sealing layer (500) is disposed in a closed surrounding manner along an outer periphery of the mica end face.

7. The stack tower according to claim 6, wherein the sealing layer (500) is a high temperature glue.

8. The stack tower according to claim 1, characterized in that it comprises one said stack (100); or, the stack tower comprises a plurality of said stacks (100) arranged in a stack height direction (H).

9. The stack tower according to claim 8, further comprising a fastening assembly for fastening the stack (100), the fastening assembly comprising:

the gas distribution plate comprises springs (1), wherein support lugs (2) are symmetrically arranged on the peripheral wall surface of the gas distribution plate (300), an upper mica sheet (3) is arranged above the galvanic pile (100), a galvanic pile pressing plate (4) is arranged on the upper mica sheet (3) at the top in the pile height direction (H), and the springs (1) are arranged between each support lug (2) and the galvanic pile pressing plate (4) in a penetrating manner; and

the fixing seats (14) are respectively sleeved on the springs (1), the fixing seats (14) are respectively sleeved on the support lugs (2) and the pile pressing plate (4) and are respectively located between the fixing seats (14).

10. The stack tower according to claim 9, wherein the elastic force of the spring (1) is gradually reduced from top to bottom in the stack height direction (H).

11. The stack tower according to claim 3, further comprising an anode inlet main pipe segment (5) and an anode outlet main pipe segment (6), wherein the anode inlet branch pipe and the anode outlet branch pipe are respectively by-connected to the anode inlet main pipe segment (5) and the anode outlet main pipe segment (6).

12. The stack tower according to claim 11, wherein adjacent anode inlet main pipe segments (5) and adjacent anode outlet main pipe segments (6) are connected by corrugated pipes (7) in the stack height direction (H).

13. A fuel cell comprising a stack column according to any one of claims 1 to 12.

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