Solid oxide stack connector structure and preparation method thereof

Abstract

The invention relates to a solid oxide stack connector structure and a preparation method thereof, the solid oxide stack connector structure comprises an upper end plate, an insulating plate, a top plate, a sealing material, a connector and a battery module, and a battery repeating part, the sealing material, the connector and the battery module, the sealing material, a bottom plate, an insulating sealing plate and a lower end plate are combined to clamp and fix the upper end plate and the lower end plate; the connecting body and the battery module comprise an air inlet, an air outlet, an air flow channel groove, an air flow channel ridge, a raw material gas inlet, a raw material gas outlet, a raw material gas flow channel groove and a raw material gas flow channel ridge; the connector comprises a top plate, a bottom plate and a connector body, the top plate is provided with a plurality of grooves, the connector body is composed of a connector body with the grooves, a battery piece, an air side current collecting piece, a raw material gas side current collecting piece, a groove sealing material bottom and a groove sealing material side face, and the top plate, the bottom plate and the connector body are all rectangular flat plates, and the connector body is provided with a plurality of raw material gas flow channels and raw material gas flow channel ridges in the length direction of one side. And a plurality of air flow channels and air flow channel ridges are arranged on the other side in the width direction. The glass panel has the advantages that the consumption of glass sealant can be reduced, a cover plate is omitted, the cost is reduced, the sealing section and the consumption of the sealant are reduced, the sealing leakage risk is reduced, assembly is simple, system heat can be utilized, and the system efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen energy, and particularly relates to a solid oxide stack interconnect structure and a preparation method thereof. Background Art

[0002] In the prior art, battery chips are usually placed in a cover plate member, and then a sealing material is used to connect the cover plate and the interconnect to achieve the contact between the battery chips and the flow channels on the interconnect. When assembling the stack with the interconnect, the interconnect, battery chips, cover plate, sealing material, and current collector are assembled layer by layer in sequence, resulting in deficiencies such as an increased number of layers, complex assembly, time-consuming, and laborious; for the stack, an additional connecting cover plate is usually designed to place the battery chips. First, the battery chips are sealed with the cover plate, and then the connecting cover plate is sealed with the interconnect body. This not only increases the amount of sealing surfaces and glass seals, increasing the risk of seal leakage, but also adds a processing procedure for the connecting cover plate. With too many stacked layers, the stack assembly process is complex, and there are deficiencies such as complex processing, increased processing costs and the cost of using glass sealant, large overall volume and weight of the stack, long current output path, and increased resistance; most of the designed inlets and outlets of the interconnect are multiple small holes, which are complex to process, increase the processing cost of the interconnect and the complexity of the sealant and will result in an increased gas flow resistance. When the gas inlets and outlets are not directly connected to the flow channels, the gas flow uniformity is affected, reducing the gas utilization rate and the electrochemical reaction efficiency. In addition, for some interconnect structures, holes need to be drilled on the battery chips, which are prone to cracking and deformation, reducing the qualification rate of battery chip preparation. For another part of the interconnect, it is an external air duct interconnect design. Although the design is relatively simple and the cost is low, its requirement for sealing is high and it cannot recover the excess heat of the system, thus reducing the overall efficiency of the system.

[0003] To solve the above problems, several solutions have been successively disclosed: Patent CN 117059855 A, "A connection layer structure for a solid oxide fuel cell stack", includes an air side wall and a fuel side wall arranged opposite to each other. The connecting body is also provided with a recess, and the current collector is arranged in the recess so that the current collector and the connecting body are of the same layer structure, which can reduce the stacking layers of the stack, further simplify the structure of the stack and reduce the sealing section. At the same time, it reduces the current output path and resistance. However, the depth of the recess of this structure is less than the depth of the flow channel, and the fuel side flow channel still needs to extend out of the recess for the pressing and sealing of the battery sheet and the seal. This not only makes the processing of the connecting body complex, but also the stack repetition area of the stack includes the connecting plate and the battery sheet, resulting in complex assembly; Patent CN 219286456 U, "A connecting body of a high-temperature solid oxide electrolysis cell stack", has a plurality of air flow channels equally spaced on the upper surface of the connecting body body, and a plurality of hydrogen flow channels equally spaced on the lower surface. The air flow channels and the hydrogen flow channels are arranged in a cross pattern, and a gas inlet and a gas outlet penetrating the connecting body body are provided on the connecting body body. The overall structure design of this connecting body is simple, easy to manufacture, and can make the most of the effective area of the battery, improving the gas utilization rate. However, this connecting plate design requires the battery sheets to be separately sealed and placed, resulting in too many stack layers of the stack. In addition, the air path of this connecting plate is an external air duct, resulting in too large a pressure difference on both sides of the battery, easy leakage, and inability to recover the system heat, reducing the efficiency.

[0004] Therefore, it is of great significance to develop a connecting body structure for a solid oxide stack and its preparation method. Summary of the Invention

[0005] The object of the present invention is to overcome the deficiencies of the prior art and provide a connecting body structure for a solid oxide stack and its preparation method. It is successively composed of an upper end plate, an insulating plate, a top plate, a sealing material, a connecting body and a battery module, a battery repeating part, a sealing material, a connecting body and a battery module, a sealing material, a bottom plate, an insulating sealing plate, and a lower end plate from top to bottom, and the upper end plate and the lower end plate with bolt holes are clamped and fixed up and down by a fastening rod; the connecting body and the battery module include a connecting body body with an air inlet, an air outlet, an air flow channel groove, an air flow channel ridge, a raw material gas inlet, a raw material gas outlet, a raw material gas flow channel groove, a raw material gas flow channel ridge, and a groove, a battery sheet, an air side current collector, a raw material gas side current collector, a bottom of the groove sealing material, and a side of the groove sealing material. The top plate, the bottom plate, and the connecting body body are all rectangular flat plates. The connecting body body is provided with a plurality of linearly or wavy-spaced raw material gas flow channels and raw material gas flow channel ridges arranged along one side length direction, and a plurality of linearly or wavy-spaced air flow channels and air flow channel ridges arranged along the other side width direction.

[0006] The object of the present invention is accomplished by the following technical solutions:

[0007] Solid oxide stack connector structure and its preparation method; aiming at the problems of uneven gas distribution, large flow resistance, large amount of stack sealing material, high risk of seal leakage, excessive number of stack layers, and complex assembly in the existing connector, it includes an upper end plate, an insulating plate, a top plate, a sealing material, a connector and a battery module, a battery repeating part, a sealing material, a connector and a battery module, a sealing material, a bottom plate, an insulating sealing plate, and a lower end plate combination from top to bottom in sequence, and a fastening rod is used to clamp and fix the middle part up and down with the upper end plate and the lower end plate with bolt holes; the connector and the battery module include an air inlet, an air outlet, an air flow channel groove, an air flow channel ridge, a raw material gas inlet, a raw material gas outlet, a raw material gas flow channel groove, a raw material gas flow channel ridge, a connector body with grooves, battery cells, an air side current collector, a raw material gas side current collector, a bottom of the groove sealing material, and a side of the groove sealing material. The top plate, the bottom plate, and the connector body are all set as rectangular flat plates. Along one side length direction of the connector body, a number of linearly or wavily arranged raw material gas flow channels and raw material gas flow channel ridges are provided at intervals, and along the other side width direction, a number of linearly or wavily arranged air flow channels and air flow channel ridges are provided at intervals.

[0008] The innovation points of the present invention are as follows:

[0009] (1) The design of reserved battery grooves in the connector reduces the sealing end face, reduces the amount of glass sealant, simplifies the stack assembly process, and reduces the number of stack layers. A battery groove is designed on the connector, and the battery cell is placed in the internal groove, making it an integral structure with the connector body. When assembling the stack, only the connector needs to be repeatedly stacked between the top plate and the bottom plate, reducing the number of stack layers, simplifying the stack assembly process, facilitating installation, reducing the overall volume and weight of the stack. At the same time, it shortens the current output path and reduces the resistance.

[0010] (2) Optimize the design of the common air channels and flow channels of the connector to improve gas uniformity and reaction utilization rate. Adopt the design of long waist hole inlet and outlet channels to replace multiple small round holes, ensure sufficient air intake, reduce processing procedures, reduce the gas resistance of the main flow channel at the same time, improve the uniformity of gas distribution between stacks, and design the internal air channel structure of the stack to realize the utilization of system waste heat. The cathode and anode gas flow channels adopt a cross design to reduce local overheating, ensure more uniform reactions inside the stack, improve the durability performance of the stack, and the flow channels are directly connected and interconnected with the gas inlets and outlets, ensuring that the gas can enter the flow channels fully and evenly. Optimize the width ratio of the flow channels and ridges to make the most of the effective area of the battery and improve the uniformity, utilization rate of the reaction gas, and the rate of electrochemical reaction.

[0011] (3) The overall structure of the connector is designed simply, which is easy to manufacture, reduces processing costs, not only helps to reduce manufacturing and operating costs, but also can improve production efficiency, product consistency and system reliability, thus providing a solid foundation for the wide application of the stack. Through the design of the grooves on the connector itself, the gas distributors on both sides of the raw material gas and air and the battery chips are placed in the grooves of the connector, eliminating the connecting cover plate, reducing the sealing section, not only can reduce the amount of glass sealant by more than half, but also reduce the risk of seal leakage, and at the same time reduce the cost of expensive glass sealant and the processing cost of the cover plate.

[0012] Compared with the prior art, the present invention has the following advantages or effects:

[0013] Because grooves with reserved sealing intervals on the inner side surfaces are opened on the connector, and the anode and cathode can be directly separated after the grooves are coated with sealing materials, it can not only reduce the amount of glass sealant and eliminate the cover plate, reduce costs, but also reduce the sealing section and the amount of sealant and reduce the risk of seal leakage; at the same time, since only the battery chips need to be placed in the grooves of the connector in sequence, and the battery chips and the grooves of the connector are pressed and sealed with glass sealant to block the anode-cathode interface, making the connector, battery chips and current collector become an integrated body, it can simplify the stack assembly process. When assembling the stack, only this connector structure needs to be repeatedly stacked, the assembly is simple, reducing the stack layers and the overall volume of the stack; in addition, since long waist holes with the same length as the flow channel width and directly connected to the gas flow channel are used to replace multiple small round holes in the gas inlet and outlet channels, ensuring sufficient intake air and uniform gas entering the flow channel for reaction, it can utilize the system heat and improve the system efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the raw material gas side of a connector of a solid oxide stack connector structure and its preparation method according to the present invention.

[0015] Figure 2 It is a schematic diagram of the air side of a connector of a solid oxide stack connector structure and its preparation method according to the present invention.

[0016] Figure 3 It is a schematic cross-sectional view of the groove on the raw material gas side of a solid oxide stack connector structure and its preparation method according to the present invention.

[0017] Figure 4 It is a schematic cross-sectional view of the placement of battery chips and current collectors in the grooves of a solid oxide stack connector structure and its preparation method according to the present invention.

[0018] Figure 5 It is an exploded schematic diagram of the placement of battery chips and current collectors in the groove structure of a solid oxide stack connector structure and its preparation method according to the present invention.

[0019] Figure 6 It is an explosion schematic diagram of the stack structure of a solid oxide stack connector structure and its preparation method proposed according to the present invention.

[0020] Figure 7 It is a simulation schematic diagram of the gas flow volume on both sides of the SOEC connector of a solid oxide stack connector structure and its preparation method proposed according to the present invention.

[0021] Figure 8 It is a simulation analysis schematic diagram of the gas pressure on the raw material gas side of five connector pieces of a solid oxide stack connector structure and its preparation method proposed according to the present invention.

[0022] Figure 9 It is a simulation analysis schematic diagram of the gas pressure on the air side of five connector pieces of a solid oxide stack connector structure and its preparation method proposed according to the present invention.

[0023] Each identification symbol in the attached drawings respectively represents:

[0024] 1. Upper end plate 2. Insulating plate 3. Top plate 4. Sealing material 5. Connector and battery module 501. Connector body 502. Groove 503. Raw material gas inlet 504. Raw material gas outlet 505. Raw material gas flow channel groove 506. Raw material gas flow channel ridge 51. Air side current collector 511. Air inlet 512. Air outlet 513. Air flow channel 514. Air flow ridge 52. Battery sheet 53. Bottom of groove sealing material 54. Raw material gas side current collector 55. Side of groove sealing material 6. Bottom plate 7. Insulating sealing plate 8. Lower end plate 9. Threaded hole 10. Battery repeating part

[0025] The present invention will be further described in detail below with reference to the attached drawings. Specific embodiments

[0026] As Figures 1-9As shown, a solid oxide stack interconnect structure and its preparation method. Aiming at the problems of uneven gas distribution, large flow resistance, large amount of stack sealing material, high risk of seal leakage, excessive number of stack layers, and complex assembly in the existing interconnect, it includes, from top to bottom in sequence, an upper end plate 1, an insulating plate 2, a top plate 3, a sealing material 4, an interconnect and a battery module 5, a battery repeating part 10, a sealing material 4, an interconnect and a battery module 5, a sealing material 4, a bottom plate 6, an insulating sealing plate 7, and a lower end plate 8. The upper end plate 1 and the lower end plate 8 with bolt holes 9 are clamped and fixed up and down to hold the middle part; the interconnect and the battery module 5 includes a connector body 501 containing an air inlet 511, an air outlet 512, an air flow channel groove 513, an air flow channel ridge 514, a raw material gas inlet 503, a raw material gas outlet 504, a raw material gas flow channel groove 505, a raw material gas flow channel ridge 506, and a groove 502, a battery sheet 52, an air side current collector 51, a raw material gas side current collector 54, a bottom groove sealing material 53, and a side groove sealing material 55. The top plate 3, the bottom plate 6, and the connector body 501 are all set as rectangular flat plates. The connector body 501 is provided with a plurality of linearly or wavy-spaced raw material gas flow channels 505 and raw material gas flow channel ridges 506 arranged at intervals along one side length direction, and a plurality of linearly or wavy-spaced air flow channels 513 and air flow channel ridges 514 arranged at intervals along the other side width direction.

[0027] The present invention may further be

[0028] Both sides of the connector body 501, the top plate 3, and the bottom plate 6 of the rectangular flat plates are made of high-temperature resistant ferritic stainless steel materials. A battery placement groove 502 is provided on the upper side of the connector body 501, and its depth matches that of the battery sheet and the sealing material, generally 0.4 - 0.6 mm, and its size is 0.5 - 1 mm larger than the outer contour of the battery; it can be adapted to batteries with a size of 10 cm - 20 cm.

[0029] The raw material gas reaction side of the connector body 501 is processed into a downwardly sunken rectangular groove 502. The bottom of the groove 502 is on the same plane as the raw material gas flow channel ridge 506. The width of the groove 502 is the same as the width of the battery sheet 10, and the length is slightly longer than the battery sheet 10 by 0.5 - 1 mm. A certain space is left on both sides and at the bottom for coating glass sealant. The battery sheet 52 is closely attached to the side of the groove 502 to ensure that there is no cross-leakage between the raw material gas and the air. During preparation, the current collector layers 51 and 54 are evenly coated on both sides of the battery sheet 52, sealant is coated in the groove 502 area, and the battery sheet is placed in the connector groove 502, so that the battery sheet 52, the current collector areas 51 and 54 form an interconnect and a battery module 5 with the connector 501.

[0030] The raw material gas flow channels 505 and the air flow channels 513 are perpendicular to each other, and all the flow channels in the flow channel group have the same length.

[0031] The inlet and outlet channels 503 and 504 for the raw material gas and the inlet and outlet channels 511 and 512 for air are all long waist-shaped holes, symmetrically distributed on both sides of the raw material gas flow channel 505 and the air flow channel 513. First, it evenly distributes and flows into each flow channel from the air inlet 511 to ensure the uniformity of the electrochemical reaction in the repeated part 10 of the single cell, and then evenly flows out from the raw material gas outlet 504 and the air outlet 512. Other areas of the connector body 501 are sealed areas coated with glass sealing material.

[0032] The flatness of the upper and lower surfaces of the connector body 501 is maintained at less than 0.1 mm, which can tightly connect the connector body 501, the battery 10, and the glass sealant up and down, and can ensure that there is no gas leakage.

[0033] The width of the raw material gas flow channel on the upper plane of the connector body 501 is 0.5 - 2.5 mm, the ridge width is 0.2 - 2.5 mm, the flow channel depth is 0.5 - 1.5 mm, and the flow channel length is equal to the battery size.

[0034] The flow channels of the connector body 501 are designed in a cross shape, which can minimize the flow pressure drop, reduce local overheating, ensure more uniform reactions inside the stack, and improve the durability of the stack.

[0035] The raw material gas inlet 503, the raw material gas outlet channel 504, the air inlet 511, and the air outlet 512 are set as long waist-shaped holes and placed on both sides of each flow channel.

[0036] The long waist-shaped hole is 90 - 200 mm long and 8 - 15 mm wide at the bottom of the groove seal material (53). Gas can fully and evenly enter the reaction flow channel, optimize the width ratio of the flow channel to the ridge, make the best use of the effective area of the battery, participate in the reaction on both sides of the battery sheet 52, and can improve the uniformity, utilization rate of the reaction gas, and the rate of the electrochemical reaction.

[0037] Both the upper end plate 1 and the lower end plate 8 are provided with conductive lugs.

[0038] The repeated part 10 of the battery can be repeatedly assembled according to actual power requirements, which can reduce the volume and weight of the stack and greatly reduce the cost.

[0039] Embodiment

[0040] Refer to Figure 1 、 2, the connector includes a connector body 501 and upper and lower surfaces, which is a rectangular flat plate structure made of ferritic stainless steel, having good electrical conductivity, high-temperature oxidation resistance, and a coefficient of thermal expansion matching the electrolyte. The upper surface is the raw material reaction side, and a plurality of raw material gas channels and raw material gas channel ridges 56 are evenly arranged at equal intervals along the length direction of the connector. The raw material gas channels are arranged at intervals and can be straight or wavy. The width of the raw material gas channel is 0.5 - 2.5 mm, the width of the ridge is 0.2 - 2.5 mm, and the depth is 0.5 - 1.5 mm. The lower surface is the air reaction side, and a plurality of air channels and air channel ridges 514 are evenly arranged at equal intervals along the width direction of the connector body. The air channels are arranged at intervals in sequence and can be straight or wavy. The width of the channel is 0.5 - 3 mm, the width of the ridge is 0.5 - 3 mm, and the depth is 0.5 - 1.5 mm. The raw material gas channels and the air channels are perpendicular to each other, and the lengths of all channels in the channel group are equal, adapting to the size of the battery cell 90*90 - 150*150 mm. All gas inlet and outlet channels adopt long waist hole design. The lengths of the raw material gas inlet and outlet 503, 504 channels are 90 - 150 mm, the widths are 8 - 15 mm, and they are symmetrically distributed on both sides of the raw material gas channels. The lengths of the air inlet and outlet 511, 512 channels are 90 - 150 mm, the widths are 5 - 12 mm, and they are symmetrically distributed on both sides of the air channels. In addition, the lengths of the raw material gas inlet and outlet 503, 504 and the air inlet and outlet 511, 512 channels are consistent with the channel widths, and they are all directly connected to the gas channels. The gas enters through the inlet channels and is directly and evenly distributed into each channel for electrochemical reaction, and then flows out evenly through the gas outlet. This not only ensures sufficient intake air volume but also reduces the resistance, making the gas volume distributed to each channel basically the same, realizing the uniform distribution of reaction gas to each battery cell 52, so that the electrochemical reaction on the electrode surface of the battery cell 52 can proceed fully. In addition, the other areas of the connector body 501 are sealing areas for coating the sealing material 4. The flatness of the upper and lower surfaces of the connector is kept within 0.1 mm, and the connector, the battery cell 52, and the sealing material 4 are tightly connected to ensure that gas does not leak.

[0041] Refer to Figure 3 , a rectangular groove 502 is formed by downward depression processing on the raw material gas reaction side of the connector body 501. The depth of the groove 502 depends on the thickness of the battery cell and the current collector, about 0.4 - 0.6 mm. The depth of the groove 502 can be equal to or less than the sum of the thicknesses of the battery cell 52 and the current collectors 51, 54. The current collectors 51, 54 include an air side and a raw material gas side. The bottom of the groove 502 is in the same plane as the raw material gas channel ridge 506.

[0042] Refer to Figure 4, the groove 502 is the same width as the battery cell 52 and slightly longer than the battery cell in length, with a certain space left on both sides for applying the sealing material 4, so that the battery cell 52 fits closely against the side of the groove 502. At the same time, the sealing material 4 is also applied between the bottom surface of the groove 502 and the battery cell 52 to ensure that there is no leakage between the raw material gas and the air. At this time, the battery cell 52 and the current collectors 51, 54 can be placed in the connecting body groove 502, so that the current collectors 51, 54, the battery cell 52 and the connecting body form an integral same-layer structure.

[0043] Referring to Figure 6 , the connecting body assembles the battery units into an SOC stack. The stack structure includes a lower end plate 8, an insulating sealing plate 7, a bottom plate 6, a battery repeating part 10, a top plate 3, an insulating plate 2, and an upper end plate 1. Bolt holes 9 are respectively provided on the upper and lower end plates, and the above units are fixed by fastening rods. Among them, the battery unit includes a connecting body, a battery cell 52 and the sealing material 4 on both sides, a raw material gas side current collector 54 and an air side current collector 51. The raw material gas side current collector 54 is placed on the raw material gas flow channel ridge 505 in the connecting body groove 502. The battery cell 52 is pressed and sealed with the bottom surface and side surface of the groove 502 through the sealing material 4. Then, the air side current collector 51 is placed on the surface of the battery cell 52, and finally a battery unit is formed. The raw material gas side current collector 54 and the air side current collector 51 can be made of nickel mesh or silver mesh, and the current collectors 51, 54 are in contact with the battery cell 52. The assembly of the battery cell 52 and the current collectors 51, 54 is completed in the connecting body groove 502. At this time, the battery cell 52, the current collectors 51, 54, the sealing material 4 and the connecting body are an integral same-layer structure. One side of the bottom plate 6 is a raw material gas side connecting body, and the installation of the battery cell 52, the current collectors 51, 54 and the sealing material 4 on the bottom plate 6 is also completed according to the above placement steps. The top plate 3 is a single-sided air side connecting body; a distribution groove is provided on the lower end plate 8, and the gas is evenly distributed after passing through the distribution groove and then flows into the connecting body gas channel. An insulating sealing plate 7 is placed between the bottom plate 6 and the lower end plate 8, which not only realizes the sealing between the two components but also plays the role of insulating the stack body from external auxiliary components; the sealing material is coated on the four peripheral edges of the connecting body to realize the connection and sealing between the connecting bodies. When assembling the stack, assemble in the order of the lower end plate 8, the insulating sealing plate 7, the bottom plate 6, the battery unit, the top plate 3, the insulating plate 2, and the upper end plate 1. According to the actual power requirement, only the connecting bodies of the above integral structure need to be repeatedly assembled.

[0044] Referring to Figure 7 , the gas volume deviation of the raw material gas side flow channel is between -0.06% and 0.04%, and the flow rate fluctuation is 0.1%; the gas volume deviation of the air side flow channel is between -0.1% and 0.08%, and the flow rate fluctuation is 0.18%.

[0045] Referring to Figures 8-9The results of the air pressure simulation on both sides of the five-piece connector show that the air pressure transition of the entire stack is good, there is no air pressure step point, the pressure loss on the fuel gas side is 279 Pa, and the pressure loss on the air side is 890 Pa. The simulation results of gas flow rate and pressure reflect good uniformity between different flow channel groups, very uniform reaction gas flow rates between the same flow channel groups, and basically the same velocity within the same flow channel group, indirectly reflecting the uniformity of the electrochemical reaction and the overall temperature distribution of the stack. Therefore, the optimized connector has greatly improved the uniformity of gas distribution. To further verify the gas flow rate distribution uniformity and flow resistance of the optimized connector structure, a flat-plate solid oxide electrolyzer simulation model was established. The specific working conditions are as follows: the reaction temperature is 750 °C, and the current density is 1.2 A / cm 2 , and the inlet gases are water vapor and air, with flow rates of 0.07 g / s and 0.5 g / s respectively. As Figure 7 can be seen, the gas flow rate deviation on the fuel gas side flow channels is between -0.06% and 0.04%, and the flow rate fluctuation is 0.1%; the gas flow rate deviation on the air side flow channels is between -0.1% and 0.08%, and the flow rate fluctuation is 0.18%. The results of the air pressure simulation on both sides of the 5-piece connector show that the air pressure transition of the entire stack is good, there is no air pressure step point, the pressure loss on the fuel gas side is 279 Pa, and the pressure loss on the air side is 890 Pa. The simulation results of gas flow rate and pressure reflect good uniformity between different flow channel groups, very uniform reaction gas flow rates between the same flow channel groups, and basically the same velocity within the same flow channel group, indirectly reflecting the uniformity of the electrochemical reaction and the overall temperature distribution of the stack. Therefore, the optimized connector has also greatly improved the uniformity of gas distribution.

[0046] As described above, the present invention can be preferably implemented. The above embodiments are only the best implementation modes of the present invention, but the implementation modes of the present invention are not limited by the above embodiments. Any changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present invention shall be equivalent replacement methods and are all included in the protection scope of the present invention.

Claims

1. Solid oxide stack interconnect structure and its preparation method, aiming at the problems of uneven gas distribution, large flow resistance, large amount of stack sealing material, high risk of seal leakage, excessive number of stack layers, and complex assembly in the existing interconnect, characterized in that It includes a combination of an upper end plate (1), an insulating plate (2), a top plate (3), a sealing material (4), a connecting body and a battery module (5), a battery repeating part (10), a sealing material (4), a connecting body and a battery module (5), a sealing material (4), a bottom plate (6), an insulating sealing plate (7), and a lower end plate (8) from top to bottom in sequence. The upper end plate (1) and the lower end plate (8) with bolt holes (9) are clamped and fixed in the middle part up and down by a fastening rod; the connecting body and the battery module (5) include a connecting body body (501) containing an air inlet (511), an air outlet (512), an air flow channel groove (513), an air flow channel ridge (514), a raw material gas inlet (503), a raw material gas outlet (504), a raw material gas flow channel groove (505), a raw material gas flow channel ridge (506), and a groove (502), a battery cell (52), an air side current collector (51), a raw material gas side current collector (54), a bottom of the groove sealing material (53), and a side of the groove sealing material (55). The top plate (3), the bottom plate (6), and the connecting body body (501) are all rectangular flat plates. The connecting body body (501) is provided with a number of linearly or wavy-spaced raw material gas flow channels (505) and raw material gas flow channel ridges (506) arranged at intervals along the length direction of one side, and a number of linearly or wavy-spaced air flow channels (513) and air flow channel ridges (514) arranged at intervals along the width direction on the other side.

2. The solid oxide stack connector structure and its preparation method according to claim 1, characterized in that Both sides of the rectangular flat plates of the connecting body body (501), the top plate (3), and the bottom plate (6) are made of high-temperature-resistant ferritic stainless steel materials. A battery placement groove (502) is provided on the upper side of the connecting body body (501), and its depth matches that of the battery cell and the sealing material, generally 0.4 - 0.6 mm, and its size is 0.5 - 1 mm larger than the outer contour of the battery; it can be adapted to batteries with sizes of 10 cm - 20 cm.

3. The solid oxide stack connector structure and its preparation method according to claim 1 or 2, characterized in that The raw material gas reaction side of the connecting body body (501) is processed into a rectangular groove (502) by downward depression. The bottom of the groove (502) is on the same plane as the raw material gas flow channel ridge (506). The width of the groove (502) is the same as the width of the battery repeating part (10), and the length is slightly longer than the battery repeating part (10) by 0.5 - 1 mm. A certain space is left on both sides and at the bottom for coating glass sealant. The battery cell (52) is closely attached to the side of the groove (502) to ensure no leakage between the raw material gas and the air. During preparation, the current collector layers (51, 54) are evenly coated on both sides of the battery cell (52), sealant is coated in the groove (502) area, and the battery cell (52) is placed in the connecting body groove (502) so that the battery cell (52), the current collector areas (51, 54), the sealing area, and the connecting body (501) form the connecting body and the battery module (5).

4. The solid oxide stack connector structure and its preparation method according to claim 1, characterized in that The raw material gas flow channels (505) and the air flow channels (513) are perpendicular to each other, and all the flow channels in the flow channel group have the same length.

5. The solid oxide stack connector structure and its preparation method according to claim 1 or 4, characterized in that The channels of the raw material gas inlet and outlet (503, 504) and the air inlet and outlet (511, 512) are all long waist-shaped holes, symmetrically distributed on both sides of the raw material gas flow channel (505) and the air flow channel (513). First, the air flows in evenly from the air inlet (511) into each flow channel to ensure the uniformity of the electrochemical reaction in the repeated part (10) of the single cell, and then flows out evenly from the raw material gas outlet (504) and the air outlet (512). The other areas of the connector body (501) are sealed areas coated with glass sealing material.

6. The solid oxide stack interconnect structure and its preparation method according to claim 1, characterized in that The flatness of the upper and lower surfaces of the connector body (501) is maintained at less than 0.1 mm, which can make the connector body (501), the battery (10) and the glass sealant closely connected up and down, and can ensure that there is no gas leakage.

7. The solid oxide stack connector structure according to claim 1 and its preparation method are characterized in that The width of the raw material gas flow channel on the upper plane of the connector body (501) is 0.5 - 2.5 mm, the ridge width is 0.2 - 2.5 mm, the flow channel depth is 0.5 - 1.5 mm, and the flow channel length is equal to the battery size.

8. The solid oxide stack interconnect structure and its preparation method according to claim 1 or 6 or 7, characterized in that The flow channels of the connector body (501) are designed in a cross shape, which can minimize the flow pressure drop, reduce local overheating, ensure more uniform reactions inside the stack, and improve the durability of the stack.

9. The solid oxide stack connector structure and its preparation method according to claim 1, characterized in that The raw material gas inlet (503), the raw material gas outlet channel (504), the air inlet (511) and the air outlet (512) are set as long waist-shaped holes and placed on both sides of each flow channel.

10. The solid oxide stack interconnect structure and its preparation method according to claim 9, characterized in that The length of the long waist-shaped hole is 90 - 200 mm, and the width is 8 - 15 mm. The gas can enter the reaction flow channel fully and evenly, optimize the width ratio of the flow channel to the ridge, make the best use of the effective area of the battery, participate in the reaction on both sides of the battery sheet 52, and can improve the uniformity, utilization rate of the reaction gas and the rate of the electrochemical reaction.

11. According to the solid oxide stack connector structure and its preparation method described in claim 1, it is characterized in that The upper end plate (1) and the lower end plate (80) are both provided with conductive lugs.

12. The solid oxide stack connector structure and its preparation method according to claim 1 are characterized in that The repeated part (10) of the battery can be repeatedly assembled according to the actual power demand, which can reduce the volume and weight of the stack and greatly reduce the cost.

Images