CN217134436U - Fuel cell stack tower assembly and fuel cell control system - Google Patents

Abstract

The utility model provides a fuel cell stack tower component and a fuel cell control system, wherein each stack tower is formed by sequentially connecting and stacking a plurality of through type solid oxide fuel cells in series in the height direction; each fuel cell comprises a cell piece and pole pieces which are used as a positive pole and a negative pole of the fuel cell and are arranged at two ends of the cell piece; each pile of towers is provided with an air inlet channel and an air outlet channel which are mutually independent; the fuel cell stack tower assembly includes: the gas distribution device is used for providing fuel gas for the fuel cells in each stack tower and collecting tail gas generated after the fuel gas reacts with the fuel cells; the conductive collector plate is arranged on the gas distribution device; and the plurality of stack tower groups are vertically arranged on the conductive current collecting plate, and each stack tower group comprises a first stack tower and a second stack tower which are connected in series through the conductive current collecting plate. The utility model discloses a fuel cell stack tower subassembly simple structure, on the basis that does not change stack tower overall structure, the normal position is optimized, effectively avoids short circuit between the stack tower, realizes simple efficient stack tower series connection.

Description

Fuel cell stack tower assembly and fuel cell control system

Technical Field

The utility model relates to a solid oxide fuel cell technical field specifically relates to a fuel cell stack tower subassembly and a fuel cell control system.

Background

The solid oxide fuel cell is a clean and efficient power generation device, and the realization of large-scale, commercialization and intellectualization of a solid oxide fuel cell system is an important development direction. The through type solid oxide fuel cell is an important type of fuel cell, and compared with a non-through type electric stack configuration, the through type electric stack can realize direct stacking of electric stacks, and an additional gas distribution device is not needed between the electric stacks, so that system integration and simplification are facilitated.

In addition, when the solid oxide fuel cell system is used for power generation and grid connection, the required voltage of the power grid side is limited to a certain extent and cannot be too low, and when the through-type galvanic piles are vertically stacked to form a pile tower, the number of the galvanic piles in the pile tower is limited by the pressure bearing capacity of the galvanic piles and the gas distribution uniformity, and the required voltage of the power grid side cannot be achieved. In order to make the output voltage reach a specified value, the stack towers need to be connected in series, so that the structure of the solid oxide fuel cell system is complicated, the manufacturing cost is increased, the possibility of short circuit of the fuel cell is increased, and the safety factor is low.

SUMMERY OF THE UTILITY MODEL

An object of the embodiment of the utility model is to provide a fuel cell stack tower subassembly and fuel cell control system, this fuel cell stack tower subassembly is used for solving simple structure, and manufacturing cost is local, and factor of safety is high

In order to achieve the above object, an embodiment of the present invention provides a fuel cell stack tower assembly, each stack tower is formed by stacking a plurality of through solid oxide fuel cells in series in a height direction; each fuel cell comprises a cell piece and pole pieces which are used as a positive pole and a negative pole of the fuel cell and are arranged at two ends of the cell piece; each pile of towers is provided with an air inlet channel and an air outlet channel which are mutually independent; the fuel cell stack tower assembly includes:

the gas distribution device is used for providing fuel gas for the fuel cells in each stack tower and collecting tail gas generated after the fuel gas reacts with the fuel cells;

the conductive collector plate is arranged on the gas distribution device;

and the plurality of stack tower groups are vertically arranged on the conductive current collecting plate, and each stack tower group comprises a first stack tower and a second stack tower which are connected in series through the conductive current collecting plate.

Optionally, the gas inlet channel of each stack tower is communicated with the conductive collecting plate and the gas inlets arranged at corresponding positions on the gas distribution device, and the fuel gas from the fuel conveying pipeline is input into the gas inlet channel of the stack tower through the conductive collecting plate and the gas inlets on the gas distribution device;

and the gas outlet channel of each pile of towers is communicated with the conductive collecting plate and the gas outlet arranged at the corresponding position on the gas distribution device and is used for outputting the reacted tail gas to a gas recovery pipeline through the conductive collecting plate and the gas outlet on the gas distribution device.

Optionally, the gas distribution device includes:

the gas distribution plate is internally provided with a fuel supply channel and a tail gas discharge channel which are mutually independent in a penetrating way;

the air inlet on the air distribution device is communicated with the fuel conveying pipeline through a corresponding fuel supply channel;

and the exhaust port on the gas distribution device is communicated with the gas recovery pipeline through a corresponding tail gas exhaust channel.

Optionally, the fuel cell stack tower assembly further comprises:

the insulating cover plate is fixed at the top of the tower stacking group by taking the connecting rods vertically arranged on the gas distribution plate as supports.

Optionally, the pole pieces of the fuel cells at the respective ends of the first stack tower and the second stack tower of each stack tower group are respectively provided with a first tab, and the first tabs of the fuel cells at the respective ends of the first stack tower and the second stack tower of each stack tower group are respectively used as the positive pole and the negative pole of the stack tower group.

Optionally, at least one second tab serving as a connection electrode is disposed on the conductive current collecting plate.

The utility model also provides a fuel cell control system, the system includes: the fuel cell stack tower assembly described above; and a plurality of switch converting circuits;

each tower group is connected to a power transmission bus through a corresponding switch conversion circuit;

the switch conversion circuit is used for adjusting the output voltage of the corresponding stack tower group.

Optionally, the switch converting circuit includes:

one end of the first grid-connection device is connected to the second lug through the first single-pole switch, and the other end of the first grid-connection device is connected to the first lug of the first stack tower of the corresponding stack tower group;

the second grid-connected device and the second single-pole switch are connected in parallel, one common end of the second grid-connected device and the second single-pole switch is connected with a first tab of a second reactor tower of the corresponding reactor tower group, and the other common end of the second grid-connected device and the second single-pole switch is connected between the first grid-connected device and the first single-pole switch;

the first grid-connected device and the second grid-connected device are connected to the power transmission bus.

Optionally, the switch converting circuit includes:

one end of the third grid-connected device is connected to the second lug through the third single-pole switch, and the other end of the third grid-connected device is connected to the first lug of the first stack tower of the corresponding stack tower group;

one end of the fourth grid-connected device is connected to the first tab of the second reactor of the corresponding reactor group, and the other end of the fourth grid-connected device is connected between the third grid-connected device and the third single-pole switch;

the moving end of the single-pole double-throw switch is connected between the third grid-connected device and the third single-pole switch, and the two fixed ends are respectively connected with a first pole lug of a first stack tower and a first pole lug of a second stack tower of the corresponding stack tower group;

and the third grid-connected device and the fourth grid-connected device are connected to the transmission bus.

Optionally, the switch converting circuit includes:

the system comprises a fourth single-pole switch, a fifth grid-connected device and a fifth single-pole switch, wherein one end of the fifth grid-connected device is connected to a first pole lug of a first stack tower of a corresponding stack tower group through the fourth single-pole switch, and the other end of the fifth grid-connected device is connected to a second pole lug through the fifth single-pole switch;

one end of the sixth grid-connected device is connected between the fifth grid-connected device and the fifth single-pole switch, and the other end of the sixth grid-connected device is connected to a first tab of a second reactor of the corresponding reactor group through the sixth single-pole switch;

one end of the seventh single-pole switch is connected to the first lug of the first stack tower of the corresponding stack tower group, and the other end of the seventh single-pole switch is connected between the fifth grid-connected device and the fifth single-pole switch;

and the fifth grid-connected device and the sixth grid-connected device are both connected to a transmission bus.

According to the technical scheme, all the stacking towers are arranged on one conductive current collecting plate, so that the lowest electrode of each stacking tower is at the same potential, and the conductive current collecting plate is used for connecting two stacking towers in each stacking tower group in series, so that short circuit among the stacking towers can be effectively avoided, the structure is simple, and the safety coefficient is high; on the basis of not changing the overall structure of the reactor, the in-situ optimization realizes simple and efficient series connection of the reactors, avoids the influence of the bearing capacity of the galvanic pile, and realizes the superposition of the voltage of the reactor group.

Other features and advantages of embodiments of the present invention will be described in detail in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments 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 embodiments of the invention, but do not constitute a limitation of the embodiments of the invention. In the drawings:

FIG. 1 is a schematic view of a portion of a fuel cell stack tower assembly provided by the present invention;

FIG. 2 is a schematic diagram of a fuel cell stack tower assembly provided by the present invention;

fig. 3 is a schematic structural diagram of a gas distribution device in a fuel cell stack tower assembly provided by the present invention;

fig. 4 is a schematic structural diagram of a first fuel cell provided by the present invention;

fig. 5 is a schematic structural diagram of a second fuel cell provided by the present invention;

fig. 6 is a schematic structural diagram of a fuel cell control system according to a first embodiment of the present invention;

fig. 7 is a schematic structural diagram of a fuel cell control system according to a second embodiment of the present invention;

fig. 8 is a schematic structural diagram of a fuel cell control system according to a third embodiment of the present invention;

fig. 9 is a schematic structural diagram of a fuel cell control system according to a fourth embodiment of the present invention.

Description of the reference numerals

2-air distribution device; 3-a conductive collector plate; 4-a stack of towers;

5-an insulating cover plate; 10-a transmission bus; 11-a fuel cell;

12-a first tab; 21-gas distribution plate; 22-fuel delivery pipes;

23-a gas recovery line; 31-a second tab; 41-a first column;

42-a second stack; 51-a connecting rod; 61-a first pooling device;

62-a second grid-connected device; 63-a third grid connection device; 64-a fourth grid connection device;

65-a fifth grid-connected device; 66-a sixth grid-connected device; 71-a first single pole switch;

72-a second single pole switch; 73-a third single-pole switch; 74-single pole double throw switch;

75-a fourth single-pole switch; 76-a fifth single-pole switch; 77-sixth single pole switch;

78-a seventh single-pole switch; 79-eighth single pole switch; 101-anode inlet;

102-anode gas outlet channel; 103-cathode inlet channel; 104-cathode gas outlet channel;

111-a cell sheet; 112-pole piece; 201-air inlet;

202-an exhaust port; 211-fuel supply channel; 212-exhaust gas discharge channel.

Detailed Description

The following describes in detail embodiments of the present invention with reference to the accompanying drawings. It is to be understood that the description herein is only intended to illustrate and explain embodiments of the present invention, and is not intended to limit embodiments of the present invention.

In the embodiments of the present invention, unless otherwise stated, the use of directional terms such as "upper, lower, left, and right" generally refers to the directions or positional relationships shown in the drawings, or the directions or positional relationships that the products of the present invention are usually placed when in use.

The terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

The terms "parallel", "perpendicular", etc. do not require that the components be absolutely parallel or perpendicular, but may be slightly inclined. For example, "parallel" merely means that the directions are more parallel relative to "perpendicular," and does not mean that the structures are necessarily perfectly parallel, but may be slightly tilted.

The terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal, vertical or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

Furthermore, the terms "substantially", and the like are intended to indicate that the relative terms are not necessarily strictly required, but may have some deviation. For example: "substantially equal" does not mean absolute equality, but it is difficult to achieve absolute equality in actual production and operation, and certain deviations generally exist. Thus, in addition to absolute equality, "substantially equal" also includes the above-described case where there is some deviation. In this case, unless otherwise specified, terms such as "substantially", and the like are used in a similar manner to those described above.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

FIG. 1 is a schematic view of a portion of a fuel cell stack tower assembly provided by the present invention; FIG. 2 is a schematic diagram of a fuel cell stack tower assembly provided by the present invention; fig. 3 is a schematic structural diagram of a gas distribution device in a fuel cell stack tower assembly provided by the present invention; fig. 4 is a schematic structural diagram of a first fuel cell provided by the present invention; fig. 5 is a schematic structural diagram of a second fuel cell provided by the present invention; fig. 6 is a schematic structural diagram of a fuel cell control system according to a first embodiment of the present invention; fig. 7 is a schematic structural diagram of a fuel cell control system according to a second embodiment of the present invention; fig. 8 is a schematic structural diagram of a fuel cell control system according to a third embodiment of the present invention.

As shown in fig. 1-2, the present embodiment provides a fuel cell stack assembly, each stack being formed by stacking a plurality of through-type solid oxide fuel cells 11 in series in the height direction; each fuel cell 11 includes a cell sheet 111 and pole pieces 112 as the positive pole and the negative pole of the fuel cell 11 at both ends of the cell sheet 111; each pile of towers is provided with an air inlet channel and an air outlet channel which are mutually independent; the fuel cell stack tower assembly includes:

the gas distribution device 2 is used for providing fuel gas for the fuel cells 11 in each stack tower and collecting tail gas generated after the fuel gas reacts with the fuel cells 11;

the conductive collector plate 3 is arranged on the gas distribution device 2;

and a plurality of stack tower groups 4 vertically arranged on the conductive current collecting plate 3, each stack tower group 4 including a first stack tower 41 and a second stack tower 42 connected in series through the conductive current collecting plate 3.

Specifically, the through-type solid oxide fuel cell 11 generally includes a cell sheet 111 and pole pieces 112 as a positive electrode and a negative electrode of the fuel cell 11 at both ends of the cell sheet 111, the pole pieces 112 as the positive electrode and the negative electrode are disposed on the top end face and the bottom end face of the cell sheet 111 and are respectively disposed in close contact with the top end face and the bottom end face of the cell sheet 111, so that the potential at each point on the pole piece 112 as the positive electrode or the negative electrode is the same and can function to fix the cell sheet 2. Each pile of tower is piled up by a plurality of fuel cell 11 in the direction of height and is formed by piling up in proper order in series, pole piece 112 between two adjacent fuel cell 11 contacts each other and sealing connection arranges, sealed glue sealing gap department specifically can be adopted, and each pile of tower all has mutually independent inlet channel and outlet channel, pole piece 112 between two adjacent fuel cell 11 contacts each other and sealing connection arranges, realize sealed contact, avoid the fuel gas in the inlet channel to outwards reveal, and avoid the tail gas in the outlet channel to outwards reveal.

More specifically, the gas distributor 2 is provided with the conductive current collecting plate 3, and a plurality of stack tower groups 4 are provided on the plurality of stack tower groups 4, and each stack tower group 4 comprises a first stack tower 41 and a second stack tower 42 which are connected in series through the conductive current collecting plate 3. The gas distribution device 2 is in direct close contact with the conductive current collecting plate 3, the contact surface of each stack tower group 4 and the conductive current collecting plate 3 is in close connection to realize sealing, specifically, sealant can be adopted to seal the gap, and the gas distribution device 2 can also play a bearing role; in addition, the gas distribution device 2 and the conductive current collecting plate 3 can adopt conductive materials with an integrally formed structure, and the conductive current collecting plate 3 and the gas distribution device 2 can be connected in a splicing mode of the conductive current collecting plate 3 capable of conducting electricity and the non-conductive gas distribution device 2; the specific structure of the conductive collector plate 3 can be designed according to the actual use environment and the arrangement mode of the stack tower group 4, and can be specifically set to be in the shapes of a cylinder, a ring, a cube and the like; the distribution of the pile tower groups 4 on the conductive current collecting plate 3 can also adopt a cylindrical shape or be arranged according to a certain rule, so that the heat dissipation and ventilation of each pile tower can be ensured.

By the method, on the basis of not changing the overall structure of the system stack towers, the in-situ optimization is carried out, the original voltages of the two stack towers are combined into the voltage of one stack tower group, the in-situ doubling of the grid-connected voltage is realized, the output power is not influenced, and the output voltage can meet the voltage requirement of the power grid side.

More specifically, each stack tower group 4 includes a first stack tower 41 and a second stack tower 42, and in order to connect the first stack tower 41 and the second stack tower 42 in series through the conductive current collecting plate 3, the arrangement directions of the positive and negative electrodes of the fuel cells 11 in the first stack tower 41 and the second stack tower 42 are opposite, so that the current flowing through the first stack tower 41 is opposite to the current flowing through the first stack tower 42.

Further, as shown in fig. 1-3, the gas inlet channel of each stack tower is communicated with the conductive current collecting plate 3 and the gas inlet 201 arranged at the corresponding position on the gas distribution device 2, and the fuel gas from the fuel delivery pipeline 22 is input into the gas inlet channel of the stack tower through the gas inlet 201 on the conductive current collecting plate 3 and the gas distribution device 2;

the gas outlet channel of each stack of towers is communicated with the conductive collecting plate 3 and the gas outlet 202 arranged at the corresponding position on the gas distribution device 2, and is used for outputting the reacted tail gas to the gas recovery pipeline 23 through the conductive collecting plate 3 and the gas outlet 202 on the gas distribution device 2.

Specifically, the fuel delivery pipe 22 and the gas recovery pipe 23 both use high-temperature-resistant insulating pipes to improve the service life and, at the same time, avoid causing short-circuiting of the battery cells. The corresponding positions of the conductive current collecting plate 3 and the gas distribution device 2 are respectively provided with a gas inlet 201 and a gas outlet 202, the number of the gas inlets 201 and the number of the gas outlets 202 are determined by the number of the stack tower groups 4, and the positions of the gas inlets 201 and the gas outlets 202 are determined by the arrangement positions of the stack tower groups 4.

Further, the gas distribution device 2 includes:

the exhaust gas purification device comprises a gas distribution plate 21, wherein a fuel supply channel 211 and an exhaust gas discharge channel 212 which are independent mutually are arranged in the gas distribution plate 21 in a penetrating way;

the air inlet 201 on the air distribution device 2 is correspondingly communicated with the fuel conveying pipeline 22;

the exhaust port 202 of the gas distribution device 2 is communicated with the gas recovery pipeline 23 through a corresponding exhaust gas discharge passage 212.

Specifically, the gas distribution device 2 comprises a gas distribution plate 21, the gas distribution plate 21 is a sheet structure with a certain thickness, and the shape of the gas distribution plate 21 is determined according to the arrangement position of the stacking tower group 4, and can be specifically set to be in the shape of a cylinder, a circular ring, a cube, or the like; in addition, a fuel supply channel 211 and a tail gas exhaust channel 212 which are independent from each other are arranged in the gas distribution plate 21, the fuel supply channel 211 and the tail gas exhaust channel 212 can be arranged independently from each other, and the fuel supply channel 211 is connected with the fuel conveying pipeline 22, so that fuel gas conveyed by the fuel conveying pipeline 22 can enter the corresponding stack tower through the corresponding fuel supply channel 211 through the corresponding gas inlet 201 for reaction, and after the fuel gas reacts with the fuel cell 11, the generated tail gas can enter the corresponding gas recovery pipeline 23 through the corresponding exhaust port 202 through the corresponding tail gas exhaust channel 212 for recovery.

More specifically, fig. 4 is a schematic structural diagram of a first fuel cell provided by the present invention; fig. 5 is a schematic structural diagram of a second fuel cell provided by the present invention. As shown in fig. 4-5, in the prior art, the fuel cells 11 generally have two structures, the first type of fuel cell 11 is an air-open stack, the cathode gas channel is coupled in the cell structure, the fuel cell 11 only includes an anode gas inlet channel 101 and an anode gas outlet channel 102, after the fuel cells 11 of this type are stacked in series in the height direction, the anode gas inlet channel 101 is stacked in series in the height direction to form a gas inlet channel of the stack tower, and the anode gas outlet channel 102 is stacked in series in the height direction to form a gas outlet channel of the stack tower; the second fuel cell 11 includes an anode inlet 101, an anode outlet 102, a cathode inlet 103, and a cathode outlet 104, where the inlet channel of the stack tower specifically includes an anode inlet channel and a cathode inlet channel, and the outlet channel of the stack tower specifically includes an anode outlet channel and a cathode outlet channel; the anode inlet channel 101 is sequentially overlapped in the height direction to form an anode inlet channel of the reactor tower, the anode outlet channel 102 is sequentially overlapped in the height direction to form an anode outlet channel of the reactor tower, the cathode inlet channel 103 is sequentially overlapped in the height direction to form a cathode inlet channel of the reactor tower, and the cathode outlet channel 104 is sequentially overlapped in the height direction to form a cathode outlet channel of the reactor tower.

At this time, the gas inlet 201 is divided into an anode gas inlet and a cathode gas inlet, and the gas outlet 202 includes a gas outlet and a cathode gas outlet; the corresponding fuel supply channel 211 is divided into an anode fuel supply channel and a cathode fuel supply channel, and the tail gas exhaust channel 212 is divided into an anode tail gas exhaust channel and a cathode tail gas exhaust channel; the corresponding fuel conveying pipelines are divided into an anode fuel conveying pipeline and a cathode fuel conveying pipeline, and the gas recovery pipeline is divided into an anode gas recovery pipeline and a cathode gas recovery pipeline. And the anode fuel supply channel, the cathode fuel supply channel, the anode tail gas exhaust channel and the cathode tail gas exhaust channel are all positioned in the gas distribution plate 21 and are independent of each other, the anode fuel supply channel is communicated with the anode fuel conveying pipeline, the cathode fuel supply channel is communicated with the cathode fuel conveying pipeline, the anode tail gas exhaust channel is communicated with the cathode gas recovery pipeline, and the cathode tail gas exhaust channel is communicated with the cathode gas recovery pipeline.

Further, the fuel cell stack tower assembly further comprises:

the insulating cover plate 5 is supported and fixed on the top of the stack tower group 4 by the connecting rods 51 vertically arranged on the gas distribution plate 21.

Specifically, the insulating cover plate 5 is arranged to assist and fix each stack tower, the insulating cover plate 5 is fixed at the top of the stack tower group 4 by using a plurality of connecting rods 51 vertically arranged on the gas distribution plate 21 as supports, each stack tower is fixed between the gas distribution plate 21 and the insulating cover plate 5 by using the plurality of connecting rods 51 as supports, and more specifically, the insulating cover plate 5 and each stack tower can be arranged in grooves matched with each other by the fuel cell at the contact position of the insulating cover plate 5 and each stack tower, so that the pole piece 112 part at the end part of each stack tower is positioned in the groove to realize the limit clamping.

Further, the pole piece 112 of the fuel cell at the end of each of the first stack tower 41 and the second stack tower 42 of each stack tower group 4 is provided with a first tab 12, and the first tab 12 of the fuel cell at the end of each of the first stack tower 41 and the second stack tower 42 of each stack tower group 4 is used as the positive pole and the negative pole of the stack tower group 4, respectively.

Specifically, in order to facilitate the output voltage of each stack of tower groups 4, the first tab 12 is disposed on the pole piece 112 of the fuel cell at the end of each of the first stack tower 41 and the second stack tower 42 of each stack of tower groups 4, and since the bottom end of each of the first stack tower 41 and the second stack tower 42 of each stack of tower groups 4 contacts the current-conducting current-collecting plate 3, the pole piece 112 of the fuel cell at the end of each of the first stack tower 41 and the second stack tower 42 of each stack of tower groups 4 can be understood as the first tab 12 disposed on the pole piece 112 at the top of the fuel cell at the topmost end of each of the first stack tower 41 and the second stack tower 42, which serves as the positive pole and the negative pole of the stack of tower groups 4, so as to be in contact with a testing device, a grid-connected device or a load to form a loop for providing electric energy. Further, for convenience of connection, the first tab 12 may be disposed on the end face of the pole piece 112, or may be disposed on the side face. When the terminal is arranged on the end face of the pole piece 112, a through hole is formed in the corresponding position of the insulating cover plate 5 for the corresponding first tab 12 to pass through, so that the wiring is convenient.

Further, at least one second tab 31 as a connection electrode is provided on the conductive current collecting plate 3.

Specifically, the second tab 31 is disposed on the current collecting plate 3, and serves as one pole of each stack of towers, and under a specific condition, the corresponding first tab 12 is matched to connect two ends of the testing device, the grid-connected device or the load, so that the stack of towers and the testing device, the grid-connected device or the load form a loop, and a single stack of towers provides electric energy. The second tabs 31 may be provided in a plurality, and are distributed on the current collecting plate 3 in an interval arrangement manner, or may be determined according to the arrangement position of the stack tower groups 4, specifically, one second tab 31 may be provided between adjacent stack tower groups, so as to reduce the path of the current flowing through the current collecting plate 3.

The utility model discloses the embodiment still provides a fuel cell control system, the system includes: the fuel cell stack tower assembly described above; and a plurality of switch converting circuits;

each tower group 4 is connected to a power transmission bus 10 through a corresponding switch conversion circuit;

the switch conversion circuit is used for adjusting the output voltage of the corresponding stack tower group 4.

Specifically, each stack tower group 4 is connected to the power transmission bus 10 through a corresponding switch conversion circuit, the switch conversion circuit plays a role in conducting electricity, electric energy generated by the stack tower groups 4 is connected into the power transmission bus 10 in a grid mode, and meanwhile output voltage can be adjusted to meet voltage use requirements of loads.

Fig. 6 is a schematic structural diagram of a fuel cell control system according to a first embodiment of the present invention, and as shown in fig. 6, in the present embodiment, the switching converter circuit includes:

one end of the first grid collecting device 61 is connected to a second pole lug through the first single-pole switch 71, and the other end of the first grid collecting device 61 is connected to a first pole lug of the first stack tower 41 of the corresponding stack tower group 4;

a second grid-connected device 62 and a second single-pole switch 72 connected in parallel, wherein one common end of the second grid-connected device 62 and the second single-pole switch 72 is connected with a first tab of a second stack tower 42 of the corresponding stack tower group 4, and the other common end is connected between the first grid-connected device 61 and the first single-pole switch 71;

the first grid-connected device 61 and the second grid-connected device 62 are both connected to the transmission bus 10.

In the actual using process, because the voltage requirements of loads and the like may have certain differences in different application stages, the first grid-connected device 61 can control the first stack tower 41 to be connected to the grid and the second grid-connected device 62 can control the second stack tower 42 to be connected to the grid by closing the first single-pole switch 71 and opening the second single-pole switch 72 according to the using requirements, so that the first stack tower 41 and the second stack tower 42 can be controlled independently; further, the first single pole switch 71 is turned off, the second single pole switch 72 is turned on, the first tower 41 and the second tower 42 are connected in series, and the first grid-connection device 61 simultaneously controls the first tower 41 and the second tower 42 to be connected in a grid, thereby achieving series grid-connection of the first tower 41 and the second tower 42.

In the embodiment, only two single-pole switches are adopted for control, the number of switches is small, the control method is simple, the cost can be saved, and the independent control and the synchronous control of the first piling tower 41 and the second piling tower 42 can be realized.

Fig. 7 is a schematic structural diagram of a fuel cell control system according to a second embodiment of the present invention; as shown in fig. 7, the switching conversion circuit includes:

a third grid-connected device 63 and a third single-pole switch 73, wherein one end of the third grid-connected device 63 is connected to the second tab through the third single-pole switch 73, and the other end is connected to the first tab of the first stack tower 41 of the corresponding stack tower group 4;

a fourth grid-connected device 64, one end of which is connected to the first tab of the second stack tower 42 of the corresponding stack tower group 4, and the other end of which is connected between the third grid-connected device 63 and the third single-pole switch 73;

a single-pole double-throw switch 74, a moving end of the single-pole double-throw switch 74 is connected between the third grid-connected device 63 and the third single-pole switch 73, and two fixed ends are respectively connected with a first pole ear of the first stack tower 41 and a first pole ear of the second stack tower 42 of the corresponding stack tower group 4;

the third grid connection device 63 and the fourth grid connection device 64 are both connected to the transmission bus 10.

In the actual using process, because there may be a certain difference in the voltage requirements of the load and the like at different operating stages, according to the using requirements, the third grid-connected device 63 controls the first stack tower 41 to be connected to the grid and the fourth grid-connected device 64 controls the second stack tower 42 to be connected to the grid by closing the third single-pole switch 73 and opening the single-pole double-throw switch 74, so that the first stack tower 41 and the second stack tower 42 can be controlled independently; in addition, by disconnecting the third single-pole switch 73, the moving end of the single-pole double-throw switch 74 is switched to the stationary end connected with the first tab of the first stack 41, so that the first stack 41 and the second stack 42 are connected in series, and the third grid-connection device 63 simultaneously controls the first stack 41 and the second stack 42 to be connected in parallel, thereby realizing the series grid-connection of the first stack 41 and the second stack 42; and after the third single-pole switch 73 is switched off, the moving end of the single-pole double-throw switch 74 is switched to the fixed end of the first tab connected with the second stack tower 42, so that the first stack tower 41 and the second stack tower 42 are connected in series, and the fourth grid-connection device 64 simultaneously controls the first stack tower 41 and the second stack tower 42 to be connected in a grid mode, so that the series connection of the first stack tower 41 and the second stack tower 42 is realized.

In addition, in the embodiment, when the third grid-connected device 63 of the two grid-connected devices fails, the isolation of the failed third grid-connected device 63 can be realized by switching the single-pole double-throw switch 74, and the fourth grid-connected device 64 can be rapidly switched to the fourth grid-connected device 64 for control, and similarly, when the fourth grid-connected device 64 fails, the isolation of the failed fourth grid-connected device 64 is realized by switching the single-pole double-throw switch 74, and the control can be rapidly switched to the third grid-connected device 63 for control.

Fig. 8 is a schematic structural diagram of a fuel cell control system according to a third embodiment of the present invention, and as shown in fig. 8, the switching circuit includes:

a fourth single-pole switch 75, a fifth grid-connected device 65, and a fifth single-pole switch 76, where one end of the fifth grid-connected device 65 is connected to the first tab of the first stack tower 41 of the corresponding stack tower group 4 through the fourth single-pole switch 75, and the other end is connected to the second tab through the fifth single-pole switch 76;

a sixth grid-connected device 66 and a sixth single-pole switch 77, wherein one end of the sixth grid-connected device 66 is connected between the fifth grid-connected device 65 and the fifth single-pole switch 76, and the other end is connected to the first tab of the second stack tower 42 of the corresponding stack tower group 4 through the sixth single-pole switch 77;

a seventh single-pole switch 78, one end of which is connected to the first tab of the first stack tower 41 of the corresponding stack tower group 4, and the other end of which is connected between the fifth grid-connected device 65 and the fifth single-pole switch 76;

the fifth grid-connection device 65 and the sixth grid-connection device 66 are both connected to the transmission bus 10.

In the actual using process, because there may be a certain difference in the voltage requirements of the loads and the like in different operation stages, according to the using requirements, the fifth grid-connected device 65 controls the first stack tower 41 to be connected to the grid, and the sixth grid-connected device 66 controls the second stack tower 42 to be connected to the grid, by closing the fourth single-pole switch 75, the fifth single-pole switch 76 and the sixth single-pole switch 77, and opening the seventh single-pole switch 78, the first stack tower 41 and the second stack tower 42 can be controlled independently; in addition, the fourth single pole switch 75 and the fifth single pole switch 76 are opened, the sixth single pole switch 77 and the seventh single pole switch 78 are closed, the first stack tower 41 and the second stack tower 42 are connected in series, and the sixth grid connection device 66 simultaneously controls the grid connection of the first stack tower 41 and the second stack tower 42, so that the series grid connection of the first stack tower 41 and the second stack tower 42 is realized.

In the embodiment, a plurality of single-pole switches are used for control, when the switches are disconnected, the fifth grid-connected device 65 and the sixth grid-connected device 66 are completely disconnected from the main loop, so that the main loop is under safe voltage, and when the fifth grid-connected device 65 and the sixth grid-connected device 66 have faults, new equipment can be timely replaced under the condition that the temperature of the galvanic pile is not increased or decreased, so that the working efficiency can be effectively improved.

Fig. 9 is a schematic structural diagram of a fuel cell control system according to a fourth embodiment of the present invention, as shown in fig. 9, based on the embodiment of fig. 8, a ninth single-pole switch 79 is connected in parallel to two ends of the sixth single-pole switch 77, the fourth single-pole switch 75, the fifth single-pole switch 76, and the sixth single-pole switch 77 are grouped into an individual control switch group, and the seventh single-pole switch 78 and the eighth single-pole switch 79 are grouped into a synchronous control switch group; one controller is adopted to control each switch in the switch group to realize that the fifth grid-connected device 65 controls the first stack tower 41 to be connected in a grid mode, and the sixth grid-connected device 66 controls the second stack tower 42 to be connected in a grid mode; and one controller is adopted to control each switch in the synchronous control switch group, so that the sixth grid-connected device 66 controls the second stack tower 42 to be connected in a grid mode, the first stack tower 41 and the second stack tower 42 are connected in series, the sixth grid-connected device 66 simultaneously controls the first stack tower 41 and the second stack tower 42 to be connected in a grid mode, and the first stack tower 41 and the second stack tower 42 are connected in a grid mode in a series mode.

In the embodiment, a plurality of single-pole switches are adopted for control, under the condition that the switches are disconnected, the fifth grid-connected device 65 and the sixth grid-connected device 66 are completely disconnected from the main loop, the fifth grid-connected device 65 and the sixth grid-connected device 66 are enabled to be under safe voltage, safety risks are reduced, when the fifth grid-connected device 65 and the sixth grid-connected device 66 break down, new grid-connected equipment can be timely replaced under the condition that the temperature of the electric pile is not increased or decreased, the safety of operators can be guaranteed, the working efficiency is effectively improved, the temperature increase or decrease of the system and the electric pile is avoided, and the service life of the electric pile is prolonged.

In the above embodiment, each of the single-pole switches and the single-pole double-throw switches is provided with a relay or the like capable of being remotely controlled, so that remote switching control can be realized to change the output voltage of each stack tower group 4 and the fuel cell system, thereby improving the safety level. Each grid-connected device may be specifically configured as an inverter or the like, and each grid-connected device may also be replaced by a stack testing device, so as to measure the voltages of the first stack tower 41 and the second stack tower 42 separately or measure the voltage of the first stack tower 41 and the second stack tower 42 after being connected in series through one stack testing device.

The above describes in detail optional implementation manners of embodiments of the present invention with reference to the accompanying drawings, however, the embodiments of the present invention are not limited to the details in the above implementation manners, and in the technical concept scope of the embodiments of the present invention, it is possible to perform various simple modifications on the technical solutions of the embodiments of the present invention, and these simple modifications all belong to the protection scope of the embodiments of the present invention.

It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, the embodiments of the present invention do not separately describe various possible combinations.

Those skilled in the art will understand that all or part of the steps in the method according to the above embodiments may be implemented by a program, which is stored in a storage medium and includes several instructions to enable a single chip, a chip, or a processor (processor) to execute all or part of the steps in the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.

In addition, various different implementation manners of the embodiments of the present invention can be combined arbitrarily, and as long as it does not violate the idea of the embodiments of the present invention, it should be considered as the disclosure of the embodiments of the present invention.

Claims (10)

1. A fuel cell stack assembly, each stack being formed by stacking a plurality of through-solid oxide fuel cells (11) in series in the height direction; each fuel cell (11) comprises a cell sheet (111) and pole pieces (112) which are used as a positive pole and a negative pole of the fuel cell (11) and are arranged at two ends of the cell sheet (111); each pile of towers is provided with an air inlet channel and an air outlet channel which are mutually independent; wherein the fuel cell stack tower assembly comprises:

the gas distribution device (2) is used for providing fuel gas for the fuel cells (11) in each stack tower and collecting tail gas generated after the fuel gas reacts with the fuel cells (11);

the conductive collector plate (3) is arranged on the gas distribution device (2);

and a plurality of stack tower groups (4) vertically arranged on the conductive current collecting plate (3), wherein each stack tower group (4) comprises a first stack tower (41) and a second stack tower (42) which are connected in series through the conductive current collecting plate (3).

2. The fuel cell stack tower assembly according to claim 1, wherein the gas inlet channel of each stack tower is communicated with the conductive current collecting plate (3) and the gas inlet (201) arranged at the corresponding position on the gas distribution device (2), and the fuel gas from the fuel conveying pipeline (22) is input into the gas inlet channel of the stack tower through the gas inlet (201) arranged on the conductive current collecting plate (3) and the gas distribution device (2);

the gas outlet channel of each pile of towers is communicated with the conductive collecting plate (3) and the gas outlet (202) arranged at the corresponding position on the gas distribution device (2) and is used for outputting the reacted tail gas to the gas recovery pipeline (23) through the conductive collecting plate (3) and the gas outlet (202) on the gas distribution device (2).

3. The fuel cell stack tower assembly according to claim 2, wherein the gas distribution device (2) comprises:

the device comprises an air distribution plate (21), wherein a fuel supply channel (211) and an exhaust gas discharge channel (212) which are independent mutually are arranged in the air distribution plate (21) in a penetrating way;

an air inlet (201) on the air distribution device (2) is communicated with the fuel conveying pipeline (22) through a corresponding fuel supply channel (211);

and an exhaust port (202) on the gas distribution device (2) is communicated with the gas recovery pipeline (23) through a corresponding tail gas exhaust channel (212).

4. The fuel cell stack tower assembly of claim 3, further comprising:

the insulating cover plate (5) is fixed at the top of the stacking tower group (4) by taking the connecting rods (51) vertically arranged on the gas distribution plate (21) as supports.

5. The fuel cell stack tower assembly according to claim 4, wherein the pole pieces (112) of the fuel cells at the respective ends of the first stack tower (41) and the second stack tower (42) of each stack tower group (4) are provided with first tabs (12), and the first tabs (12) of the fuel cells at the respective ends of the first stack tower (41) and the second stack tower (42) of each stack tower group (4) are respectively used as the positive pole and the negative pole of the stack tower group (4).

6. The fuel cell stack tower assembly according to claim 1, wherein at least one second tab (31) is provided as a connecting electrode on the electrically conductive current collector plate (3).

7. A fuel cell control system, characterized in that the system comprises: the fuel cell stack tower assembly of any one of claims 1-6; and a plurality of switch converting circuits;

each stack tower group (4) is connected to a power transmission bus (10) through a corresponding switch conversion circuit;

the switch conversion circuit is used for adjusting the output voltage of the corresponding stack tower group (4).

8. The fuel cell control system according to claim 7, wherein the switching conversion circuit includes:

one end of the first grid-connection device (61) is connected to a second pole lug through the first single-pole switch (71), and the other end of the first grid-connection device (61) is connected to a first pole lug of a first stack tower (41) of the corresponding stack tower group (4);

a second grid-connected device (62) and a second single-pole switch (72) which are connected in parallel, wherein one common end of the second grid-connected device (62) and the second single-pole switch (72) is connected with a first pole lug of a second stack tower (42) of the corresponding stack tower group (4), and the other common end is connected between the first grid-connected device (61) and the first single-pole switch (71);

the first grid-connection device (61) and the second grid-connection device (62) are both connected to the transmission busbar (10).

9. The fuel cell control system according to claim 7, wherein the switching conversion circuit includes:

the third grid-connected device (63) and the third single-pole switch (73), one end of the third grid-connected device (63) is connected to the second pole lug through the third single-pole switch (73), and the other end of the third grid-connected device is connected to the first pole lug of the first stack tower (41) of the corresponding stack tower group (4);

one end of the fourth grid-connected device (64) is connected to the first pole lug of the second stack tower (42) of the corresponding stack tower group (4), and the other end of the fourth grid-connected device is connected between the third grid-connected device (63) and the third single-pole switch (73);

the moving end of the single-pole double-throw switch (74) is connected between the third grid-connected device (63) and the third single-pole switch (73), and the two fixed ends are respectively connected with the first pole lug of the first stack tower (41) and the first pole lug of the second stack tower (42) of the corresponding stack tower group (4);

the third grid connection device (63) and the fourth grid connection device (64) are both connected to the transmission bus (10).

10. The fuel cell control system according to claim 7, wherein the switching conversion circuit includes:

one end of the fifth grid-connected device (65) is connected to a first pole lug of a first stack tower (41) of the corresponding stack tower group (4) through the fourth single-pole switch (75), and the other end of the fifth grid-connected device (65) is connected to a second pole lug through the fifth single-pole switch (76);

a sixth grid-connected device (66) and a sixth single-pole switch (77), wherein one end of the sixth grid-connected device (66) is connected between the fifth grid-connected device (65) and the fifth single-pole switch (76), and the other end of the sixth grid-connected device is connected to a first tab of a second stack tower (42) of the corresponding stack tower group (4) through the sixth single-pole switch (77);

a seventh single-pole switch (78), one end of which is connected to the first pole ear of the first stack tower (41) of the corresponding stack tower group (4), and the other end of which is connected between the fifth grid-connected device (65) and the fifth single-pole switch (76);

the fifth grid-connection device (65) and the sixth grid-connection device (66) are both connected to the transmission busbar (10).

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