Solid oxide fuel cell strip unit, stack unit, stack and assembly method

Abstract

The present invention provides a solid oxide fuel cell strip unit, a stack unit, a stack and an assembly method, belonging to the field of solid oxide fuel cells. The cell strip unit includes a cell strip, an insulating support and a conductor. The cell strip is disposed on the insulating support, and a conductor limiting structure is provided on the insulating support. The conductor limiting structure is used for limiting and guiding the conductor, and the conductor is used for connecting the positive or negative electrode of the cell strip to the outside. By using the solid oxide fuel cell strip unit, the stack unit, the stack and the assembly method provided by the embodiments of the present invention, the problems of large assembly difficulty and low product yield in the prior art can be solved.

Description

Technical Field

[0001] The present invention relates to the field of solid oxide fuel cells, and particularly to a solid oxide fuel cell strip unit, a stack unit, a stack and an assembly method. Background Art

[0002] A solid oxide fuel cell (SOFC for short) belongs to the third generation of fuel cells and is a fully solid-state chemical power generation device that directly and efficiently converts the chemical energy stored in fuels and oxidants into electrical energy at medium and high temperatures in an environmentally friendly manner. It is one of the fuel cells with the highest theoretical energy density and is generally considered to be a fuel cell that will be widely popularized and applied in the future.

[0003] The stack of a solid oxide fuel cell usually consists of several individual cell units. Among them, the cell unit includes a connection structure and a strip-shaped cell. The strip-shaped cell includes a positive electrode, a negative electrode and a solid oxide electrolyte. The two sides of the connection structure respectively include an anode flow field and a cathode flow field. Each strip-shaped cell and the connection structure are alternately arranged. The positive and negative electrodes of multiple strip-shaped cells need to be connected in series or in parallel to integrate different forms of battery structures. In the solid oxide fuel cell stack in the prior art, the strip-shaped cell reaches the purpose of current collection by leading the positive and negative electrodes of the cell to the outer surface of the cell and then winding positive and negative electrode wire harnesses such as silver wires or nickel wires on the positive and negative electrodes respectively.

[0004] In the prior art, when connecting the positive and negative electrodes of the strip-shaped cell by this method, there will be problems such as too many wire harnesses causing redundancy, difficulty in distinguishing and difficult connection operations, resulting in high assembly difficulty and low product yield of the solid oxide fuel cell stack. Summary of the Invention

[0005] The embodiments of the present invention provide a solid oxide fuel cell strip unit, a stack unit, a stack and an assembly method, which can solve the problems of high assembly difficulty and low product yield in the prior art. The technical solutions are as follows:

[0006] In a first aspect, a solid oxide fuel cell strip unit includes a cell strip, an insulating support and a conductor. The cell strip is arranged on the insulating support, and a conductor limiting structure is arranged on the insulating support. The conductor limiting structure is used for limiting and guiding the conductor;

[0007] The conductor is used to connect the positive electrode or the negative electrode of the cell strip to the outside.

[0008] Optionally, the conductor limiting structure is a conductor groove, and the conductor is arranged in the conductor groove.

[0009] Optionally, the conductor is disposed in the conductor groove by laying or grouting. The conductor is a nickel wire or silver paste. There are two insulating supports, and the battery strip is disposed between the two insulating supports.

[0010] Optionally, the insulating support is provided with a mounting groove matching the battery strip, and the battery strip is clamped in the mounting groove.

[0011] Optionally, a plurality of the battery strips are provided on the insulating support, and the conductor is used to connect the plurality of battery strips on the insulating support in series or in parallel.

[0012] In a second aspect, a stack unit includes a plurality of the aforementioned solid oxide fuel cell strip units. The plurality of solid oxide fuel cell strip units are stacked. In the stacking direction, two adjacent solid oxide fuel cell strip units share one insulating support. The insulating support includes a first side surface, and the conductor limiting structure is provided on the first side surface. The first side surfaces of the plurality of insulating supports are flush to form a circuit unit surface.

[0013] Optionally, one end of the battery strip is flush with the first side surface.

[0014] In a third aspect, a stack includes a plurality of the aforementioned stack units. The plurality of stack units are arranged in an array, and the circuit unit surfaces of the plurality of stack units are flush to form a circuit surface.

[0015] Optionally, an auxiliary support is further included. The auxiliary support is disposed on the battery strip and is used to fix the battery strip.

[0016] Optionally, the auxiliary support is provided with an auxiliary mounting groove matching the battery strip.

[0017] Optionally, there are a plurality of the auxiliary supports, and the plurality of auxiliary supports cooperate with the insulating supports to stack and form the stack unit.

[0018] Optionally, the plurality of battery strips form a plurality of battery groups. The battery strips in the battery group are connected in series through the conductor, and the plurality of battery groups are connected in parallel through the conductor.

[0019] Optionally, a first ceramic block is further included. The first ceramic block is connected to the insulating support. The first ceramic block has a second side surface flush with the circuit surface, and an extension groove communicating with the conductor limiting structure is provided on the second side surface.

[0020] Optionally, it further includes a second ceramic block and a third ceramic block. The second ceramic block is disposed between the insulating supports of two adjacent fuel cell stack units, and the third ceramic block is disposed between the auxiliary supports of two adjacent fuel cell stack units.

[0021] Optionally, it further includes a support frame body which is arranged around the battery strips of multiple fuel cell stack units.

[0022] Optionally, it further includes a pre-reforming chamber which is provided with a ceramic grid plate inside. The pre-reforming chamber is disposed on the circuit surface, and the outlet end of the pre-reforming chamber faces the circuit surface of the fuel cell stack.

[0023] Optionally, ventilation holes are formed in the battery strips along the length direction. One end of each ventilation hole is disposed on the circuit surface, and the outlet end of the pre-reforming chamber is communicated with all the ventilation holes on the fuel cell stack.

[0024] Optionally, the pre-reforming chamber includes a box body which is a box-shaped structure with openings at both ends. One end opening of the box body is disposed on the circuit surface, and a cover plate is provided at the other end of the box body. A pipe joint is arranged on the cover plate.

[0025] Optionally, a groove matching the box body is formed on the circuit surface, and one end of the box body is embedded and installed in the groove.

[0026] Optionally, a first step surface parallel to the circuit surface is arranged at the opening at the other end of the box body, and the cover plate is disposed on the first step surface.

[0027] Optionally, a second step surface parallel to the circuit surface is arranged inside the box body, and the ceramic grid plate is disposed on the second step surface.

[0028] Fourthly, an assembling method of a fuel cell stack is used for assembling the aforesaid fuel cell stack. The steps include:

[0029] Step 1: Dispose the insulating support on a processing table, apply high-temperature resistant glass glue on the upper surface of the insulating support, place the battery strip on the insulating support, and dispose the conductor in the conductor limiting structure on the insulating support. One end of the conductor is connected to the positive or negative electrode of the battery strip, and the other end is connected to the outside, thereby forming a solid oxide fuel cell strip unit.

[0030] Step 2: Repeat Step 1 to manufacture multiple solid oxide fuel cell strip units. Apply high-temperature resistant glass glue on the upper surface of one solid oxide fuel cell strip unit, and place another solid oxide fuel cell strip unit thereon for bonding.

[0031] Step 3: Repeat Step 2 until multiple said solid oxide fuel cell strip units are stacked into the stack unit of the required specification;

[0032] Step 4: Repeat Step 3 to fabricate multiple said stack units, and stack multiple said stack units into the stack of the required specification;

[0033] Step 5: Apply high-temperature resistant glass glue on the support frame and bond it around the battery strips of multiple said stack units;

[0034] Step 6: Apply high-temperature resistant glass glue on the opening surface of the casing and bond it to the circuit surface, then cover the cover plate on the other opening surface of the casing and bond it with high-temperature resistant glass glue.

[0035] The beneficial effects brought by the technical solution provided by the embodiment of the present invention at least include:

[0036] For the solid oxide fuel cell strip unit, stack unit, stack and assembly method provided by the embodiment of the present invention, a conductor limiting structure is provided on the insulating support member, so that when the conductors are connected to the circuit, they are limited and guided by the conductor limiting structure, thereby connecting the battery strips to the external circuit. The conductors arranged in this way are not exposed outside because they are arranged in the conductor limiting structure, so that the conductors will not be entangled with each other, and thus the situation of excessive and cumbersome wire harnesses will not occur, thereby reducing the assembly difficulty of the stack of the solid oxide fuel cell and improving the product yield. Description of the Drawings

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0038] Figure 1 is the overall structural schematic diagram of the stack of the solid oxide fuel cell provided by the embodiment of the present invention;

[0039] Figure 2 is the overall structural explosion diagram of the stack of the solid oxide fuel cell provided by the embodiment of the present invention;

[0040] Figure 3 is the structural schematic diagram of the support frame provided by the embodiment of the present invention;

[0041] Figure 4 is the structural explosion diagram of the stack of the solid oxide fuel cell provided by the embodiment of the present invention;

[0042] Figure 5Explosion diagram of the circuit surface and the first side structure provided by an embodiment of the present invention;

[0043] Figure 6 Explosion diagram of the circuit surface structure provided by an embodiment of the present invention;

[0044] Figure 7 Provided by an embodiment of the present invention Figure 6 Enlarged schematic diagram at position A;

[0045] Figure 8 Front view structure schematic diagram of the stack of the solid oxide fuel cell provided by an embodiment of the present invention;

[0046] Figure 9 Provided by an embodiment of the present invention Figure 8 Cross-sectional view taken along line B-B;

[0047] Figure 10 Provided by an embodiment of the present invention Figure 8 Cross-sectional view taken along line C-C;

[0048] Figure 11 Provided by an embodiment of the present invention Figure 8 Cross-sectional view taken along line D-D;

[0049] Figure 12 Provided by an embodiment of the present invention Figure 11 Enlarged schematic diagram at position E;

[0050] Figure 13 Structure schematic diagram of the auxiliary support provided by an embodiment of the present invention;

[0051] Figure 14 Flowchart of the assembly method provided by an embodiment of the present invention.

[0052] In the figure: 1 - battery strip; 11 - ventilation hole; 12 - anode of the battery strip; 13 - cathode of the battery strip; 14 - solid electrolyte; 15 - negative electrode post of the battery strip; 16 - positive electrode post of the battery strip; 2 - insulating support; 21 - conductor limiting structure; 211 - conductor groove; 22 - installation groove; 23 - first side; 3 - conductor; 4 - circuit unit surface; 41 - circuit surface; 411 - groove; 5 - auxiliary support; 51 - auxiliary installation groove; 61 - first ceramic block; 611 - second side; 612 - extended groove; 62 - second ceramic block; 63 - third ceramic block; 7 - pre-reforming chamber; 71 - ceramic grid plate; 72 - casing; 721 - first step surface; 722 - second step surface; 73 - cover plate; 74 - pipe joint; 8 - support frame. Detailed implementation manners

[0053] To make the objectives, technical solutions and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0054] Figure 1 is a schematic diagram of the overall structure of the stack of the solid oxide fuel cell provided by an embodiment of the present invention; Figure 2 is an exploded view of the overall structure of the stack of the solid oxide fuel cell provided by an embodiment of the present invention; Figure 3 is a schematic diagram of the support frame structure provided by an embodiment of the present invention; Figure 4 is an exploded view of the stack structure of the solid oxide fuel cell provided by an embodiment of the present invention; Figure 5 is an exploded view of the circuit surface and the first side surface provided by an embodiment of the present invention; Figure 6 is an exploded view of the circuit surface structure provided by an embodiment of the present invention; Figure 7 is provided by an embodiment of the present invention Figure 6 enlarged schematic view of part A; Figure 8 is a front view schematic diagram of the stack of the solid oxide fuel cell provided by an embodiment of the present invention; Figure 9 is provided by an embodiment of the present invention Figure 8 cross-sectional view taken along line B-B; Figure 10 is provided by an embodiment of the present invention Figure 8 cross-sectional view taken along line C-C; Figure 11 is provided by an embodiment of the present invention Figure 8 cross-sectional view taken along line D-D; Figure 12 is provided by an embodiment of the present invention Figure 11 enlarged schematic view of part E; Figure 13 is a schematic diagram of the structure of the auxiliary support provided by an embodiment of the present invention; Figure 14 is a flowchart of the assembly method provided by an embodiment of the present invention. As Figures 1 to 14 shown, a solid oxide fuel cell strip unit includes a battery strip 1, an insulating support 2, and a conductor 3. The battery strip 1 is disposed on the insulating support 2. A conductor limiting structure 21 is provided on the insulating support 2, and the conductor limiting structure 21 is used to limit and guide the conductor 3; the conductor 3 is used to connect the positive or negative electrode of the battery strip 1 to the outside.

[0055] Exemplarily, in an embodiment of the present invention, the battery strip 1 is disposed on the insulating support 2. The battery strip 1 can be plugged into the insulating support 2 or laid on the insulating support 2. In this embodiment, the battery strip 1 is laid on the insulating support 2. The conductor limiting structure 21 can be a hole or a groove. By processing the insulating support 2, the conductor limiting structure 21 is opened in advance at the position where the conductor 3 needs to be arranged. After the battery strip 1 is matched with the insulating support 2, conductors 3 are connected to both the positive and negative electrodes of the battery strip 1, and the conductors 3 are made to pass through the conductor limiting structure 21 and be connected to the outside, thereby forming a solid oxide fuel cell strip unit. When there is only one solid oxide fuel cell strip unit, the other end of the conductor 3 is connected to an external circuit. When multiple solid oxide fuel cell strip units are assembled, the other end of the conductor 3 can be connected to the negative or positive electrode of the battery strip 1 of another solid oxide fuel cell strip unit, thereby forming a series or parallel connection of multiple battery strips 1. Compared with the conventional technology where the conductor wire harness is directly exposed to the outside, in the embodiment of the present invention, by providing the conductor limiting structure 21, a limiting and guiding effect is exerted on the arrangement of the conductor 3, so that the wire harness formed by the conductors 3 is not exposed to the outside, thereby preventing the positive and negative wire harnesses of the battery strip 1 from being redundant, simplifying the wiring operation, reducing the assembly difficulty of the solid oxide fuel cell stack, and improving the product yield.

[0056] The solid oxide fuel cell strip unit provided by the embodiment of the present invention is provided with a conductor limiting structure 21 on the insulating support 2, so that when the conductor 3 is connected in a circuit, the conductor limiting structure 21 is used for limiting and guiding, thereby connecting the battery strip 1 to an external circuit. The conductor 3 arranged in this way is not exposed to the outside because it is arranged in the conductor limiting structure 21, so that the conductors 3 do not get entangled with each other, and thus the situation of excessive and redundant wire harnesses will not occur, thereby reducing the assembly difficulty of the solid oxide fuel cell stack and improving the product yield.

[0057] Optionally, the conductor limiting structure 21 is a conductor groove 211, and the conductor 3 is arranged in the conductor groove 211.

[0058] Exemplarily, in an embodiment of the present invention, when the conductor limiting structure 21 is a hole, since the hole is arranged in the center of the insulating support 2, the process of processing the hole and arranging the conductor 3 is relatively complicated. When the conductor limiting structure 21 is a conductor groove 211, the conductor groove 211 can be arranged on the surface of the insulating support 2, and it is more convenient to process and form the conductor groove 211. After the conductor 3 is arranged in the conductor groove 211, high-temperature resistant glass glue is filled at the open end of the conductor groove 211 to fix the conductor 3 in the conductor groove 211, thereby improving the installation stability of the conductor 3.

[0059] Optionally, the conductor 3 is disposed in the conductor groove 211 by laying or grouting. The conductor 3 is a nickel wire or silver paste. There are two insulating supports 2, and the battery strip 1 is disposed between the two insulating supports 2.

[0060] Exemplarily, in the embodiment of the present invention, when the conductor 3 is in the form of a nickel wire, one end of the nickel wire is disposed on the positive or negative electrode of the battery strip 1, and the other end is ready to be connected to the outside. When the conductor 3 is in the form of silver paste, the silver paste is filled in the conductor limiting structure 21. After the silver paste is cooled and solidified, one end of the path formed by the silver paste is connected to the battery strip 1, and the other end is connected to the outside. These two forms of the conductor 3 have a simple structure and are convenient to operate. The conductor 3 can be disposed in the conductor limiting structure 21, and the conductor limiting structure 21 plays a guiding and limiting role for the conductor 3. Each battery strip 1 is clamped and fixed by two insulating supports 2, and a formed solid oxide fuel cell strip unit is relatively stable.

[0061] Optionally, the insulating support 2 is provided with an installation groove 22 matching the battery strip 1, and the battery strip 1 is clamped in the installation groove 22.

[0062] Exemplarily, in the embodiment of the present invention, the installation grooves 22 matching the battery strip 1 are provided on both sides of the insulating support 2 along the stacking direction, so that the battery strip 1 is more stable when being stacked and assembled with the insulating support 2. The battery strip 1 can be embedded in the installation groove 22 for limiting, so that the formed stacked overall structure is more stable, thereby improving the stability of the solid oxide fuel cell strip unit. At the same time, the voids in the stacking forming process can also be reduced, thereby improving the space utilization rate of the solid oxide fuel cell strip unit.

[0063] Optionally, the insulating support 2 is provided with a plurality of battery strips 1, and the conductor 3 is used to connect the plurality of battery strips 1 on the insulating support 2 in series or in parallel.

[0064] Exemplarily, in the embodiment of the present invention, by providing a plurality of battery strips 1 on the insulating support 2 and connecting the plurality of battery strips 1 in series or in parallel through the conductor 3, the capacitance of the solid oxide fuel cell strip unit can be increased, and more electric energy can be supplied to external circuit devices, thereby improving the power generation efficiency of the solid oxide fuel cell strip unit.

[0065] The embodiment of the present invention further provides a stack unit, including a plurality of such as Figure 4The shown solid oxide fuel cell strip unit, a plurality of solid oxide fuel cell strip units are stacked. In the stacking direction, two adjacent solid oxide fuel cell strip units share an insulating support 2. The insulating support 2 includes a first side surface 23, and a conductor limiting structure 21 is formed on the first side surface 23. The first side surfaces 23 of a plurality of insulating supports 2 are flush to form a circuit unit surface 4.

[0066] Exemplarily, in the embodiment of the present invention, as Figure 4 shown, the upper and lower stacks are stack units. The solid oxide fuel cell strip unit is composed of a cell strip 1 and an insulating support 2. A plurality of solid oxide fuel cell strip units are stacked to form a stack unit. According to the size and shape of the stack unit to be fabricated, cell strips 1 and insulating supports 2 of different sizes can be selected for stacking, and different numbers of solid oxide fuel cell strip units can be used for stacking to form stack units of different sizes and shapes. By arranging the first side surfaces 23 of the insulating supports 2 of a plurality of stack units flush to form a circuit unit surface 4, and by forming a conductor groove 211 on the first side surface 23, after the stack unit is processed and formed, it is more convenient to install the conductor 3, and it is easier to observe the circuit connection form between a plurality of cell strips 1, thereby improving the operation convenience of the present stack unit.

[0067] Optionally, one end of the cell strip 1 is flush with the first side surface 23.

[0068] Exemplarily, in the embodiment of the present invention, by arranging one end of the cell strip 1 flush with the first side surface 23, when the conductor 3 connects each cell strip 1, the operation is more convenient, and it is easier to observe the circuit connection form between a plurality of cell strips 1, thereby further improving the operation convenience of the present stack unit.

[0069] The embodiment of the present invention further provides a stack, including a plurality of Figure 4 stack units as shown. A plurality of stack units are arranged in an array, and the circuit unit surfaces 4 of a plurality of stack units are flush to form a circuit surface 41.

[0070] Exemplarily, in the embodiment of the present invention, by stacking different numbers of stack units in different arrangement forms, solid stacks of different shapes and different sizes can be formed. In this embodiment, as Figure 4 shown, the stack is formed by arranging two upper and lower stack units in a reverse manner and bonding them with a high-temperature resistant glass glue. The circuit unit surfaces 4 of a plurality of stack units are flush to form a circuit surface 41, so that when installing the conductor 3 to connect a plurality of stack units, it is more convenient, and it is easier to observe the circuit connection form between a plurality of cell strips 1, thereby improving the operation convenience of the present stack.

[0071] Optionally, it further includes an auxiliary support member 5 which is arranged on the battery strip 1 for fixing the battery strip 1.

[0072] Exemplarily, in the embodiment of the present invention, the battery strip 1 is in a long strip structure. After stacking and bonding one end of the battery strip 1 with the insulating support member 2, due to the self-gravity of the battery strip 1, the other end of the battery strip 1 bends, and in severe cases, the battery strip 1 may be deformed and scrapped. By providing the auxiliary support member 5, a supporting force can be provided for the battery strip 1, enabling the battery strip 1 to be assembled more stably, thereby improving the stability of this fuel cell stack unit.

[0073] Optionally, an auxiliary installation groove 51 matching the battery strip 1 is formed on the auxiliary support member 5.

[0074] Exemplarily, in the embodiment of the present invention, auxiliary installation grooves 51 matching the battery strip 1 are formed on both sides of the auxiliary support member 5 along the stacking direction, making the battery strip 1 more stable when stacked and assembled with the auxiliary support member 5. The battery strip 1 can be embedded in the auxiliary installation groove 51 for positioning, making the overall stacked structure more stable, thereby improving the stability of this fuel cell stack. At the same time, the gaps during the stacking and forming process can also be reduced, thereby improving the space utilization rate of this fuel cell stack.

[0075] Optionally, there are multiple auxiliary support members 5, and the multiple auxiliary support members 5 cooperate with the insulating support member 2 to stack and form a fuel cell stack unit.

[0076] Exemplarily, in the embodiment of the present invention, arranging multiple auxiliary support members 5 for stacking is more convenient during the assembly of the fuel cell stack unit. An insulating support member 2 and an auxiliary support member 5 can be arranged in parallel at intervals, with a battery strip 1 placed thereon, and the above stacking is repeated to form a fuel cell stack unit. Compared with stacking the insulating support member 2 and the battery strip 1 first and then inserting the overall auxiliary support member 5, the method in this embodiment is easier to form and less likely to cause bending of the battery strip 1, thereby improving the operation convenience of the assembly of this fuel cell stack.

[0077] Optionally, multiple battery strips 1 form multiple battery groups, and the battery strips 1 within the battery group are connected in series through a conductor 3, and multiple battery groups are connected in parallel through a conductor 3.

[0078] Exemplarily, in the embodiment of the present invention, as Figure 6As shown in the figure, a vertical column in the figure is a battery pack. The battery strips 1 within the battery pack are connected in series, and the battery packs are connected in parallel. In this embodiment, it is designed such that every six battery strips 1 are connected in series and then in parallel. In the figure, solid lines represent the positive electrodes, and dashed lines represent the negative electrodes. According to the circuit direction, the negative electrodes are appropriately connected in parallel, while the positive electrodes are not connected in parallel first to avoid the occurrence of circulating current, and are left for the subsequent connection harness to connect in parallel. By setting the series-parallel circuit connection form, the circuits formed by multiple battery strips 1 can be diversified, and each battery strip 1 can be connected in series or in parallel according to the required circuit form to constitute a circuit structure that meets the actual usage requirements, thereby improving the diversity of this fuel cell stack.

[0079] Optionally, it further includes a first ceramic block 61. The first ceramic block 61 is connected to the insulating support 2. The first ceramic block 61 has a second side surface 611 that is flush with the circuit surface 41, and an extended groove 612 communicating with the conductor limiting structure 21 is formed on the second side surface 611.

[0080] Exemplarily, in the embodiment of the present invention, as Figure 5 shown, when the fuel cell stack is a structure formed by arranging two fuel cell stack units in a reverse manner, the circuit surface 41 is rectangular. First ceramic blocks 61 are arranged on both the upper and lower sides and the left and right sides of the circuit surface 41. By setting the first ceramic blocks 61, the circuit area of the circuit surface 41 can be enlarged, so that more circuit forms can be designed thereon, and multiple battery strips 1 can be connected in series or in parallel in different forms. Extended grooves 612 communicating with the conductor grooves 211 are formed on the first ceramic blocks 61 to meet more circuit requirements, thereby further improving the diversity of this fuel cell stack.

[0081] Optionally, it further includes a second ceramic block 62 and a third ceramic block 63. The second ceramic block 62 is arranged between the insulating supports 2 of two adjacent fuel cell stack units, and the third ceramic block 63 is arranged between the auxiliary supports 5 of two adjacent fuel cell stack units.

[0082] Exemplarily, in the embodiment of the present invention, by setting the second ceramic block 62 and the third ceramic block 63, the distance between two adjacent fuel cell stack units can be adjusted, which is convenient for later inserting the cathode outlet pipe of the heat exchanger between the two fuel cell stack units to supply air for combustion with the fuel in the combustion chamber. At the same time, the maximum outer dimension of the fuel cell stack can be adjusted, so that the assembled fuel cell stack can meet the actual usage requirements. On the other hand, the assembly error caused by stacking can be adjusted by adjusting the thickness or quantity of the second ceramic block 62 and the third ceramic block 63. By setting the second ceramic block 62 and the third ceramic block 63, the diversity of this fuel cell stack is further improved.

[0083] Optionally, it further includes a support frame 8. The support frame 8 is arranged around the battery strips 1 of multiple fuel cell stack units.

[0084] Exemplarily, in an embodiment of the present invention, the support frame 8 is of an annular structure, and the battery strips 1 between the insulating support 2 and the auxiliary support 5 are surrounded by the support frame 8. By providing the support frame 8, a support force can be provided for the stack formed by the fuel cells, and a plurality of battery strips 1 can be centrally fixed, thereby further improving the stability of the fuel cell stack. For the convenience of installing the support frame 8, during production and manufacturing, the support frame 8 can be manufactured in two symmetric sub-support frames 81, and then installed by clamping from opposite sides of the fuel cell stack towards the fuel cell stack, and a high-temperature resistant glass glue is applied at the joint of the two sub-support frames 81 for connection, thereby further improving the operational convenience of assembling the fuel cell stack.

[0085] Optionally, a pre-reforming chamber 7 is further included. A ceramic grid plate 71 is provided in the pre-reforming chamber 7. The pre-reforming chamber 7 is arranged on the circuit surface 41, and the outlet end of the pre-reforming chamber 7 faces the circuit surface 41 of the fuel cell stack.

[0086] Exemplarily, in an embodiment of the present invention, before the hydrocarbon fuel participates in the chemical reaction, it needs to be reformed to generate hydrogen and carbon monoxide, and then the chemical reaction occurs to generate electric energy. The reforming reaction is an endothermic reaction, and its required temperature is generally 800 °C. The pre-reforming chamber 7 is arranged on the circuit surface 41, and a combustion chamber is arranged on the other side of the circuit surface 41. The waste heat generated by combustion will be transferred to the pre-reforming chamber 7 through the circuit surface 41, thereby realizing the secondary utilization of the reaction waste heat. Compared with the traditional technology where a reforming chamber is separately provided and heat energy required for the endothermic reaction is separately provided for the reforming chamber, in the embodiment of the present invention, by arranging the pre-reforming chamber 7 on the circuit surface 41, the waste heat generated by the combustion reaction is recovered, thereby improving the energy conversion efficiency of the fuel cell stack. In the embodiment of the present invention, a catalyst needs to be placed in the pre-reforming chamber 7 to reform the hydrocarbon fuel. By providing the ceramic grid plate 71, a cavity can be formed between the ceramic grid plate 71 and the circuit surface 41. The catalyst is placed in this cavity, so that the ceramic grid plate 71 stably arranges the catalyst in the pre-reforming chamber 7, thereby enabling the hydrocarbon fuel and the catalyst to fully react, and further improving the energy conversion efficiency of the fuel cell stack.

[0087] Optionally, the battery strip 1 is provided with ventilation holes 11 along its length direction. One end of the ventilation hole 11 is arranged on the circuit surface 41, and the outlet end of the pre-reforming chamber 7 is communicated with all the ventilation holes 11 on the fuel cell stack.

[0088] Exemplarily, in an embodiment of the present invention, the structure of the battery strip 1 is as Figure 7As shown in the figure, the battery strip 1 is composed of a battery strip anode 12, a battery strip cathode 13, and a solid electrolyte 14. A battery strip negative terminal 15 is provided on the battery strip anode 12, and a battery strip positive terminal 16 is provided on the battery strip cathode 13. Each battery strip 1 is connected to an external wire 3 through the battery strip negative terminal 15 and the battery strip positive terminal 16. Hydrogen is introduced into the vent hole 11, and oxygen is passed outside the battery strip 1. The oxygen contacts the battery strip cathode 13 and is reduced to oxygen anions. Subsequently, the oxygen anions pass through the solid electrolyte 14, reach the battery strip anode 12, and are oxidized to produce water and carbon dioxide, releasing electrons. The generated electrons pass through the external circuit and return to the battery strip cathode 13. The electron flow direction is from the negative pole to the positive pole. Therefore, the battery strip negative terminal 15 is provided on the anode 12, and the battery strip positive terminal 16 is provided on the battery strip cathode 13 and connected to the external circuit. By providing the vent hole 11 on the battery strip 1, the hydrocarbon fuel introduced from the pre-reforming chamber 7 can be discharged from the vent hole 11 after the reforming reaction. During the discharge process, an electrochemical reaction occurs to generate electric energy. The excess fuel is finally discharged from the battery strip 1 and burns in the combustion chamber when encountering oxygen, providing the temperature required for the reaction of the fuel cell stack, thereby further improving the energy conversion efficiency of the fuel cell stack.

[0089] Optionally, the pre-reforming chamber 7 includes a box body 72. The box body 72 is a box-shaped structure with openings at both ends. One end opening of the box body 72 is provided on the circuit surface 41, and a cover plate 73 is provided at the other end of the box body 72. A pipe joint 74 is provided on the cover plate 73.

[0090] Exemplarily, in the embodiment of the present invention, by setting the pre-reforming chamber 7 in the form composed of the box body 72 and the cover plate 73, it is convenient to manufacture the pre-reforming chamber 7 and also convenient to put the catalyst into the pre-reforming chamber 7. The pipe joint 74 on the cover plate 73 can be connected to an external hydrocarbon fuel storage tank, thereby further improving the operation convenience of assembling the fuel cell stack.

[0091] Optionally, a groove 411 matching the box body 72 is provided on the circuit surface 41, and one end of the box body 72 is embedded and installed in the groove 411.

[0092] Exemplarily, in the embodiment of the present invention, by providing the groove 411 on the circuit surface 41, when the box body 72 is installed on the circuit surface 41, one end opening of the box body 72 can be set in the groove 411, so that the groove 411 limits the box body 72, and high-temperature resistant glass glue is applied to stably install the box body 72 on the circuit surface 41, thereby further improving the stability of the fuel cell stack.

[0093] Optionally, a first step surface 721 parallel to the circuit surface 41 is provided at the other end opening of the box body 72, and the cover plate 73 is provided on the first step surface 721.

[0094] Exemplarily, in an embodiment of the present invention, by providing a first stepped surface 721 parallel to the circuit surface 41 at the opening at the other end of the casing 72, when the cover plate 73 is fitted and installed with the casing 72, the cover plate 73 can be embedded in the first stepped surface 721 for installation with the casing 72. The side wall connected to the first stepped surface 721 plays a limiting role on the cover plate 73, and a high-temperature resistant glass glue is applied to stably install the cover plate 73 on the casing 72, thereby further improving the stability of the present fuel cell stack.

[0095] Optionally, a second stepped surface 722 parallel to the circuit surface 41 is provided inside the casing 72, and the ceramic grid plate 71 is arranged on the second stepped surface 722.

[0096] Exemplarily, in an embodiment of the present invention, by providing the second stepped surface 722, a high-temperature resistant glass glue can be applied on the second stepped surface 722, and the ceramic grid plate 71 can be arranged and fixed on the second stepped surface 722, so that the catalyst can be more stably fixed in the cavity between the ceramic grid plate 71 and the circuit surface 41, thereby enabling the hydrocarbon fuel and the catalyst to fully react, and further improving the energy conversion efficiency of the present fuel cell stack.

[0097] This embodiment also provides an assembly method for a fuel cell stack for assembling the foregoing fuel cell stack. The steps include:

[0098] S1: Place the insulating support 2 on the processing table, apply a high-temperature resistant glass glue on the upper surface of the insulating support 2, lay the battery strip 1 on the insulating support 2, place the conductor 3 in the conductor limiting structure 21 on the insulating support 2, connect one end of the conductor 3 to the positive or negative electrode of the battery strip 1, and connect the other end to the outside, thereby forming a solid oxide fuel cell strip unit.

[0099] S2: Repeat S1 to fabricate multiple solid oxide fuel cell strip units, apply a high-temperature resistant glass glue on the upper surface of one solid oxide fuel cell strip unit, and place another solid oxide fuel cell strip unit thereon for bonding.

[0100] S3: Repeat S2 until multiple solid oxide fuel cell strip units are stacked into a fuel cell stack unit of the required specification.

[0101] S4: Repeat S3 to fabricate multiple fuel cell stack units, and stack multiple fuel cell stack units into a fuel cell stack of the required specification.

[0102] S5: Apply a high-temperature resistant glass glue on the support frame 8 and bond it around the battery strips 1 of multiple fuel cell stack units.

[0103] S6: Apply high-temperature resistant glass glue on the opening surface of the cassette body 72 and bond it to the circuit surface 41. Then, cover the other opening surface of the cassette body 72 with the cover plate 73 and bond them together with high-temperature resistant glass glue.

[0104] Exemplarily, in an embodiment of the present invention, a stack is formed by arranging and bonding two stack units in reverse. Place a first ceramic block 61 and an auxiliary support 5 on the same plane. The upper surface of the first ceramic block 61 also has a mounting groove 22 that matches the battery strip 1. Apply high-temperature resistant glass glue in the mounting groove 22. After placing the battery strip 1 on the first ceramic block 61 and the auxiliary support 5, stack the insulating support 2 on the battery strip 1 such that the first side surface 23 of the insulating support 2 is flush with the second side surface 611 of the first ceramic block 61, and stack the auxiliary support 5 on the battery strip 1 such that multiple auxiliary supports 5 are flush. Repeat the above process of stacking the battery strip 1, the insulating support 2, and the auxiliary support 5 to form a stack unit. The stack unit can also be manufactured by another stacking method: arrange an insulating support 2 and an auxiliary support 5 in parallel and at intervals on a processing table, apply high-temperature resistant glass glue on the upper surfaces of the insulating support 2 and the auxiliary support 5, place the battery strip 1 on the insulating support 2 and the auxiliary support 5 in a direction perpendicular to the insulating support 2 and the auxiliary support 5, and make one end of the battery strip 1 flush with the side surface of the insulating support 2 away from the auxiliary support 5 to form a solid oxide fuel cell strip unit. Then apply high-temperature resistant glass glue on the upper surface of the solid oxide fuel cell strip unit and place another solid oxide fuel cell strip unit on it for bonding. According to the required stack unit, different numbers of solid oxide fuel cell strip units can be selected for stacking. Then bond the first ceramic block 61 to the assembly of the battery strip 1, the insulating support 2, and the auxiliary support 5 to form a stack unit. Arbitrarily adopt the above two methods to repeat the production of two stack units. Arrange the two stack units symmetrically and apply high-temperature resistant glass glue between the two stack units to bond the two stack units. A second ceramic block 62 and a third ceramic block 63 can be provided between the two stack units as needed to adjust the assembly error caused by stacking or to adjust the maximum size of the stack. Then, first ceramic blocks 61 are respectively arranged on both sides of the two stack units and bonded to the two stack units through high-temperature resistant glass glue such that the second side surface 611 and the circuit surface 41 form a plane. Then, conductors 3 are arranged in the conductor grooves 211 and the extended grooves 612 to connect each battery strip 1, thereby forming a current collection circuit. Then, high-temperature resistant glass glue is applied to the conductor grooves 211 and the extended grooves 612 to complete the encapsulation of the conductors 3.One end opening of the cartridge 72 is then smeared with high-temperature resistant glass glue and inserted into the groove 411 of the circuit surface 41. Wait for it to be bonded and fixed so that the cartridge 72 covers all the ventilation holes 11 of the battery strips 1. Then, a catalyst is added into the cartridge 72. After smearing high-temperature resistant glass glue on the second stepped surface 722, the ceramic grid plate 71 is covered on the second stepped surface 722 and bonded, so that the catalyst is stably arranged in the pre-reforming chamber 7. Finally, after smearing high-temperature resistant glass glue on the first stepped surface 721, the cover plate 73 is covered on the first stepped surface 721 and bonded, and the pipe joint 74 is connected to an external hydrocarbon fuel, thus completing the assembly of this fuel cell stack.

[0105] Unless otherwise defined, the technical terms or scientific terms used herein shall have the ordinary meanings as understood by those of ordinary skill in the art to which this invention pertains. The "first", "second" and similar terms used in the specification and claims of this invention patent application do not denote any order, quantity or importance, but are only used to distinguish different components. Similarly, the terms such as "a" or "one" do not denote a quantity limitation, but mean that there is at least one. The terms such as "comprising" or "including" mean that the elements or objects appearing before "comprising" or "including" cover the elements or objects listed after "comprising" or "including" and their equivalents, and do not exclude other elements or objects. The terms such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms such as "upper", "lower", "left", "right" are only used to indicate relative position relationships. When the absolute position of the object being described changes, the relative position relationships may also change accordingly.

[0106] The above are only optional embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A battery stack unit, characterized in that: The invention comprises a plurality of solid oxide fuel cell strip units, wherein the plurality of solid oxide fuel cell strip units are stacked and arranged. The solid oxide fuel cell strip unit comprises a cell strip (1), an insulating support (2) and a conductor (3), wherein the cell strip (1) is arranged on the insulating support (2), and the cell strip (1) is clamped by two insulating support members (2); The insulating support member (2) is provided with a conductor limiting structure (21), and the conductor limiting structure (21) is used to limit and guide the conductor (3); the conductor limiting structure (21) is a hole or a slot; when the conductor limiting structure (21) is a conductor slot (211), the open end of the conductor slot (211) is filled with high-temperature resistant glass glue, and the high-temperature resistant glass glue fixes the conductor (3) in the slot; In the stacking direction, two adjacent solid oxide fuel cell strip units share one insulating support member (2), the insulating support member (2) comprises a first side surface (23), and the conductor limiting structure (21) is provided on the first side surface (23); The conductor (3) is used to connect the positive electrode or the negative electrode of the battery strip (1) to the outside.

2. The battery stack unit according to claim 1, characterized in that: The conductor limiting structure (21) is a conductor slot (211), and the conductor (3) is arranged in the conductor slot (211).

3. The battery stack unit according to claim 2, characterized in that: The conductor (3) is arranged in the conductor slot (211) by means of laying or grouting, the conductor (3) is a nickel wire or a silver paste, there are two insulating support members (2), and the battery strip (1) is arranged between the two insulating support members (2).

4. The battery stack unit according to claim 3, characterized in that: The insulating support member (2) is provided with a mounting groove (22) matching the battery strip (1), and the battery strip (1) is clamped in the mounting groove (22).

5. The battery stack unit according to claim 4, characterized in that: A plurality of the battery strips (1) are arranged on the insulating support (2), and the conductor (3) is used to connect the plurality of the battery strips (1) on the insulating support (2) in series or in parallel.

6. The battery stack unit according to any one of claims 1 to 5, characterized in that: The first side surfaces (23) of the plurality of insulating support members (2) are flush with each other to form a circuit unit surface (4).

7. The battery stack unit according to claim 6, characterized in that: One end of the battery strip (1) is flush with the first side surface (23).

8. A battery stack, comprising a plurality of battery stack units according to claim 6, characterized in that: The plurality of battery stack units are arranged in an array, and the circuit unit surfaces (4) of the plurality of battery stack units are flush with each other to form a circuit surface (41).

9. The battery stack according to claim 8, characterized in that: It also comprises an auxiliary support member (5), wherein the auxiliary support member (5) is arranged on the battery strip (1) and is used to fix the battery strip (1).

10. The battery stack according to claim 9, characterized in that: The auxiliary support member (5) is provided with an auxiliary installation groove (51) matching the battery strip (1).

11. The battery stack according to claim 9, characterized in that: There are a plurality of auxiliary support members (5), and the plurality of auxiliary support members (5) cooperate with the insulating support member (2) and are stacked to form the battery stack unit.

12. The battery stack according to claim 9, characterized in that: A plurality of the battery strips (1) form a plurality of battery packs, the battery strips (1) in the battery packs are connected in series via the conductors (3), and the plurality of battery packs are connected in parallel via the conductors (3).

13. The battery stack according to claim 9, characterized in that: It also comprises a first ceramic block (61), the first ceramic block (61) being connected to the insulating support member (2), the first ceramic block (61) having a second side surface (611) flush with the circuit surface (41), and the second side surface (611) being provided with an expansion groove (612) connected to the conductor limiting structure (21).

14. The fuel cell stack according to claim 9, characterized in that: It also includes a second ceramic block (62) and a third ceramic block (63), wherein the second ceramic block (62) is arranged between the insulating support members (2) of two adjacent battery stack units, and the third ceramic block (63) is arranged between the auxiliary support members (5) of two adjacent battery stack units.

15. The battery stack according to claim 8, characterized in that: It also comprises a support frame (8), wherein the support frame (8) is arranged around the battery bars (1) of the plurality of battery stack units.

16. The battery stack according to claim 15, characterized in that: It also comprises a pre-reforming chamber (7), wherein a ceramic grid plate (71) is provided in the pre-reforming chamber (7), the pre-reforming chamber (7) is arranged on the circuit surface (41), and the outlet end of the pre-reforming chamber (7) is directly opposite to the circuit surface (41) of the fuel cell stack.

17. The battery stack according to claim 16, characterized in that: The battery strip (1) is provided with ventilation holes (11) along its length, one end of the ventilation holes (11) is arranged on the circuit surface (41), and the outlet end of the pre-reforming chamber (7) is connected to all ventilation holes (11) on the battery stack.

18. The battery stack according to claim 16, characterized in that: The pre-reforming chamber (7) comprises a box body (72), the box body (72) being a box-shaped structure with openings at both ends, one end of the box body (72) being opened on the circuit surface (41), the other end of the box body (72) being provided with a cover plate (73), and the cover plate (73) being provided with a pipe joint (74).

19. The battery stack according to claim 18, characterized in that: The circuit surface (41) is provided with a groove (411) matching the box body (72), and one end of the box body (72) is embedded and installed in the groove (411).

20. The battery stack according to claim 19, characterized in that: A first step surface (721) parallel to the circuit surface (41) is provided at the opening of the other end of the box body (72), and the cover plate (73) is provided on the first step surface (721).

21. The battery stack according to claim 20, characterized in that: A second step surface (722) parallel to the circuit surface (41) is provided in the box body (72), and the ceramic grid plate (71) is arranged on the second step surface (722).

22. A method for assembling a fuel cell stack, for assembling the fuel cell stack as claimed in claim 18, characterized in that the steps include: Step 1: placing the insulating support (2) on a processing table, applying high temperature resistant glass glue on the upper surface of the insulating support (2), placing the battery strip (1) on the insulating support (2), placing the conductor (3) in the conductor limiting structure (21) on the insulating support (2), connecting one end of the conductor (3) to the positive electrode or negative electrode of the battery strip (1), and connecting the other end to the outside, thereby forming a solid oxide fuel cell strip unit; Step 2: Repeat step 1 to make a plurality of solid oxide fuel cell strip units, apply high temperature resistant glass glue on the upper surface of one of the solid oxide fuel cell strip units, and place another solid oxide fuel cell strip unit thereon for bonding; Step 3: Repeat step 2 until a plurality of the solid oxide fuel cell strip units are stacked into the stack unit of the required specifications; Step 4: Repeat step 3 to make a plurality of the battery stack units, and stack the plurality of the battery stack units into the battery stack of required specifications; Step 5: applying high temperature resistant glass glue on the support frame (8) and bonding it to the periphery of the battery bars (1) of the plurality of battery stack units; Step six: Apply high temperature resistant glass glue on the opening surface of the box body (72) and bond it to the circuit surface (41), and then cover the cover plate (73) on the other opening surface of the box body (72) and bond them with the high temperature resistant glass glue.

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