High-temperature-difference solid oxide fuel cell stack

Abstract

The invention relates to a high-temperature-difference solid oxide fuel cell stack which comprises a plurality of repeating units, each repeating unit comprises a connecting plate and a flat plate type cell, and a first cell area and a second cell area are arranged on the two faces of the connecting plate of each repeating unit respectively. Wherein the first cell area and the second cell area on one side are provided with anode ribs and are communicated with each other through a fuel connecting channel along the arrangement direction, and the first cell area and the second cell area on the other side are provided with cathode ribs and are communicated with each other through an air connecting channel along the arrangement direction; the first battery area and the second battery area which are provided with the anode ribs are provided with a first flat plate type battery and a second flat plate type battery which are different in rated working temperature, and the rated working temperature of the second flat plate type battery is higher than that of the first flat plate type battery. The air flow required by the galvanic pile is reduced by about half compared with that of a traditional galvanic pile, the parasitic power of an air pump can be remarkably reduced, and the system efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the field of fuel cell technology, and in particular to a high-temperature-difference solid oxide fuel cell stack suitable for hydrogen power generation. Background Art

[0002] With the increasing availability of renewable energy sources such as wind and solar power, energy storage will become a rigid demand.

[0003] Converting surplus electricity into hydrogen is considered the optimal long-term, large-scale energy storage method. When renewable energy is scarce, technologies that efficiently convert stored hydrogen into electricity are crucial for hydrogen energy storage and conversion. Solid oxide fuel cells (SOFCs) are a new type of energy conversion device that operate at medium to high temperatures, boast exceptionally high conversion efficiencies, and offer low noise and zero pollution, making them the preferred technology for hydrogen power generation.

[0004] However, the problem faced by hydrogen SOFC is that due to the lack of internal reforming to absorb heat and the high power density of the fuel cell stack, the heat energy released during power generation needs to be carried away by excess air.

[0005] Traditional fuel cell stacks require a large excess air ratio due to the small allowable temperature difference between the air inlet and outlet, which increases the power consumption of the blower and reduces system efficiency. Summary of the Invention

[0006] The object of the present invention is to provide a high temperature difference solid oxide fuel cell stack to solve the above technical problems.

[0007] To achieve the above-mentioned objectives, the high-temperature difference solid oxide fuel cell stack provided by the present invention includes a plurality of repeating units, each of the repeating units includes a connecting plate and a flat-plate battery, the flat-plate battery is sealed and connected to the connecting plate, and the two sides of the connecting plate of each of the repeating units are respectively provided with a first cell area and a second cell area, wherein the first cell area and the second cell area on one side are provided with anode ribs and are connected along the arrangement direction through a fuel connecting channel, and the first cell area and the second cell area on the other side are provided with cathode ribs and are connected along the arrangement direction through an air connecting channel; the first cell area and the second cell area provided with anode ribs are provided with a first flat-plate battery and a second flat-plate battery with different rated operating temperatures, and the rated operating temperature of the second flat-plate battery is higher than the rated operating temperature of the first flat-plate battery.

[0008] Optionally, the rated operating temperature at the inlet of the second planar battery is equal to the rated operating temperature at the outlet of the first planar battery.

[0009] Optionally, the difference between the rated operating temperatures of the first and second planar batteries is 80°C-120°C, and the difference between the outlet rated operating temperature of the second planar battery and the inlet rated operating temperature of the first planar battery is 160°C-240°C.

[0010] Optionally, the difference between the rated operating temperatures of the first and second planar batteries is about 100° C., and the difference between the outlet rated operating temperature of the second planar battery and the inlet rated operating temperature of the first planar battery is about 200° C.

[0011] Optionally, the anode ribs and cathode ribs of the first battery area are parallel to each other, the anode ribs and cathode ribs of the second battery area are parallel to each other, the anode ribs of the first battery area correspond to the anode ribs of the second battery area in the downstream direction, and the cathode ribs of the first battery area correspond to the cathode ribs of the second battery area in the downstream direction.

[0012] Optionally, the anode ribs and the cathode ribs of the first battery region are staggered in the projection direction, and the anode ribs and the cathode ribs of the second battery region are staggered in the projection direction.

[0013] Optionally, the first and second planar batteries are sealed with edges of the first and second battery regions via sealing rings, and the sealing rings are double-layer structures, including a glass sealing ring and a metal sealing ring provided on the glass sealing ring.

[0014] Optionally, the sealing ring comprises a transverse portion covering the fuel connection channel and the air connection channel.

[0015] Optionally, the connecting plate is a metal connecting plate, one end of which is provided with fuel inlets and air outlets that are alternately arranged and distributed, and the other end is provided with fuel outlets and air inlets that are alternately arranged and distributed; the fuel inlet and fuel outlet are staggered, and both are connected to the fuel channel formed between the anode ribs; the air inlet and air outlet are staggered, and both are connected to the air channel formed between the cathode ribs.

[0016] Optionally, the first planar battery and the second planar battery each include an anode, an electrolyte membrane, a cathode, and a cathode current collector provided on the cathode.

[0017] For SOFC power generation systems fueled by pure hydrogen, maintaining proper stack operation requires an excessively large air stoichiometric ratio to remove heat from the stack. This present invention breaks with traditional design principles by designing two flat-plate cells with different rated operating temperatures within the same repeating unit's connecting plate. During operation, the temperatures of the two flat-plate cells, each rated at different operating temperatures, gradually increase in a co-current manner. Fuel remaining after power generation in the first flat-plate cell can be used in the second flat-plate cell, significantly improving fuel utilization. Furthermore, the air temperature at the outlet of the first flat-plate cell is fully absorbed and utilized by the second flat-plate cell, resulting in a temperature difference between the outlet air temperature of the second flat-plate cell and the inlet air temperature of the first flat-plate cell being twice that of a single flat-plate cell. For example, if the inlet and outlet air temperature difference of a single flat-plate cell is 100°C, the inlet and outlet air temperature difference of the present invention can be as high as over 200°C. This reduces the air flow required to remove the same amount of heat from the stack by approximately half compared to conventional stacks. This significantly reduces the parasitic power of the air pump and improves system efficiency when using this integrated stack system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic cross-sectional view of a high temperature difference solid oxide fuel cell stack according to the first embodiment of the present invention;

[0019] Figure 2 for Figure 1 A top view of the connecting plate with anode ribs shown in FIG;

[0020] Figure 3 for Figure 1 A top view of the sealing ring shown in ;

[0021] Figure 4 for Figure 2 A top view of the connecting plate after the first planar battery and the second planar battery are placed therein;

[0022] Figure 5 for Figure 4 Further installation Figure 3 A top view after the sealing ring is shown;

[0023] Figure 6 This is a picture of the test product with the anode ribs on the connecting plate;

[0024] Figure 7 This is a picture of the test product with the cathode rib on one side of the connecting plate.

[0025] In the picture:

[0026] 10-connecting plate; 11-anode rib; 111-fuel flow channel; 12-fuel connecting channel; 13-cathode rib; 131-air flow channel; 14-air connecting channel; 15-fuel inlet; 16-air inlet; 17-fuel outlet; 18-air outlet; 21-first flat cell; 211-electrolyte membrane; 212-cathode; 213-cathode current collector; 214-anode; 22-second flat cell; 30-sealing ring; 31-glass sealing ring; 32-metal sealing ring; 33-lateral portion. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0028] In this article, terms such as "upper, lower, inside, outside" are established based on the positional relationships shown in the drawings. Depending on the different drawings, the corresponding positional relationships may also change accordingly. Therefore, they cannot be understood as absolute limitations on the scope of protection; moreover, relational terms such as "first" and "second" are only used to distinguish one component from another with the same name, and do not necessarily require or imply any actual relationship or order between these components.

[0029] Please refer to Figure 1 、 Figure 2 、 Figure 4 、 Figure 6 、 Figure 7 , Figure 1 A schematic cross-sectional view of a high temperature difference solid oxide fuel cell stack according to the first embodiment of the present invention; Figure 2 for Figure 1 A top view of the connecting plate with anode ribs shown in FIG; Figure 4 for Figure 2 A top view of the connecting plate after the first planar battery and the second planar battery are placed therein; Figure 6 This is a picture of the test product with the anode ribs on the connecting plate; Figure 7 This is a picture of the test product with the cathode rib on one side of the connecting plate.

[0030] As shown in the figure, in a specific embodiment, the high temperature difference solid oxide fuel cell stack provided by the present invention has multiple repeating units (only one repeating unit is shown in the figure), each repeating unit includes a connecting plate 10 and a flat-plate battery, and the flat-plate battery is sealed and connected to the connecting plate 10.

[0031] The two sides of the connecting plate 10 of each repeating unit are respectively reserved with space for placing two batteries, namely the first battery area A and the second battery area B. The first battery area A and the second battery area B on one side are provided with anode ribs 11, and are connected along the arrangement direction through the fuel connection channel 12. The first battery area A' and the second battery area B' on the other side are provided with cathode ribs 13, and are connected along the arrangement direction through the air connection channel 14.

[0032] Specifically, the connecting plate 10 is a metal connecting plate, the anode ribs 11 (i.e., the anode current collecting ribs) of the first battery area A and the cathode ribs 13 (i.e., the cathode current collecting ribs) of the first battery area A' are parallel to each other, the anode ribs 11 of the second battery area B and the cathode ribs 13 of the second battery area B' are parallel to each other, the anode ribs 11 of the first battery area A and the anode ribs 11 of the second battery area B correspond to each other in the downstream direction, and the cathode ribs 13 of the first battery area A' and the cathode ribs 13 of the second battery area B' correspond to each other in the downstream direction.

[0033] The anode ribs 11 of the first cell region A and the cathode ribs 13 of the first cell region A′ are staggered in the projection direction, and the anode ribs 11 of the second cell region B and the cathode ribs 13 of the second cell region B′ are staggered in the projection direction.

[0034] One end of the connecting plate 10 is provided with a fuel inlet 15 and an air inlet 16 that are alternately arranged and distributed, and the other end is provided with a fuel outlet 17 and an air outlet 18 that are alternately arranged and distributed, so that both fuel and air have inlets and outlets; the fuel inlet 15 and the fuel outlet 17 are staggered, and both are connected to the fuel flow channel 111 formed between the anode ribs 11, and after sealing, the fuel can flow forward; the air outlet 18 and the air inlet 16 are staggered, and both are connected to the air flow channel 131 formed between the cathode ribs 13, and after sealing, the air can flow forward.

[0035] The first battery region A and the second battery region B are provided with first and second planar batteries 21 and 22 having different rated operating temperatures, and the rated operating temperature of the second planar battery 22 is higher than that of the first planar battery 21 .

[0036] Specifically, the inlet rated operating temperature of the second planar battery 22 is equal to the outlet rated operating temperature of the first planar battery 21 .

[0037] The difference between the rated operating temperatures of the first planar battery 21 and the second planar battery 22 is 80° C.-120° C., and the difference between the outlet rated operating temperature of the second planar battery 22 and the inlet rated operating temperature of the first planar battery 21 is 160° C.-240° C.

[0038] For example, the difference between the rated operating temperatures of the first planar battery 21 and the second planar battery 22 is about 100° C., and the difference between the outlet rated operating temperature of the second planar battery 22 and the inlet rated operating temperature of the first planar battery 21 is about 200° C.

[0039] If the electrolyte membrane 211 of the first flat battery 21 is taken as the core, Figure 1 When observing the cross section shown, upwards there are the cathode 212 and the cathode current collector 213. The function of the cathode current collector 213 is to ensure good electrical contact between the cathode 212 and the cathode ribs 13 of the connecting plate of another repeating unit. Figure 1 The electrolyte membrane 211 is shown below the anode 214, the anode rib 11, the connecting plate 10 and the cathode rib 13. Figure 1 The stack repeating units are overlapped and connected in series, and sealed with a sealing material on the air side (not shown in the figure), so that a high-power stack can be obtained.

[0040] Figure 4 、 Figure 5 The arrows in the figure indicate the direction of working gas flow. Air enters from the top and exits from the bottom. The operating temperature of the first flat-plate battery 21 is relatively low, while the operating temperature of the second flat-plate battery 22 is approximately 100°C higher than that of the first flat-plate battery 21. When the stack is operating, fuel and air first enter the first flat-plate battery 21, and exhaust gas after power generation immediately enters the second flat-plate battery 22. Due to the relay working effect of the two batteries, the fuel utilization rate can be guaranteed to reach more than 80%. At the same time, because the temperature difference between the inlet air temperature of the first flat-plate battery 21 and the outlet air temperature of the second flat-plate battery 22 can reach more than 200°C, the excess air ratio during stack operation can be significantly reduced, which is beneficial to improving system efficiency.

[0041] Please refer to Figure 3 、 Figure 5 , Figure 3 for Figure 1 A top view of the sealing ring shown in ; Figure 5 for Figure 4 Further installation Figure 3 A top view after the sealing ring is shown.

[0042] As shown in the figure, the left and right sides of the first flat battery 21 and the second flat battery 22 are sealed to the connecting plate 10 by sealing materials. The sealing material should be selected to ensure good electrical contact between the fuel electrode and the connecting plate ribs while ensuring that the fuel gas does not leak.

[0043] In this embodiment, in order to ensure the quality of sealing, the sealing ring 30 uses a metal sealing ring 32 of the same size as the glass sealing ring 31 to achieve double-layer sealing.

[0044] The sealing ring 30 is generally in the shape of a Chinese character 'Ri' (日), with holes corresponding to the fuel inlet 15 and the air outlet 16, and the fuel outlet 17 and the air inlet 18 provided at both ends. A transverse part 33 is provided in the middle to cover the fuel connection channel 12 and the air connection channel 14. After assembly, the transverse part 33 of the sealing ring 30 is located between the air connection channel 14 of the upper connection plate and the fuel connection channel 12 of the lower connection plate.

[0045] The high-temperature-difference solid oxide fuel cell stack of the present invention will be described in more detail below in combination with specific experimental application examples.

[0046] Application Example (1):

[0047] The first flat plate battery 21 is a ScSZ electrolyte-supported battery, with Ni-ScSZ as the anode, GDC as the barrier layer, and GDC and La

[0048] ,

[0049] , 0.8 , 0.4 , , 3-d , 0.2 , 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-d as the composite cathode, with an operating temperature of 800 °C; the second flat plate battery 22 is a YSZ electrolyte-supported battery, with Ni-YSZ as the anode, and YSZ and La 0.8 Sr 0.2 MnO 3-d as the composite cathode, with an operating temperature of 900 °C. The electrolyte film thicknesses of the first flat plate battery 21 and the second flat plate battery 22 are both 250 microns, and the effective cathode areas are both 81 cm 2 , and the battery shape is 10×10 = 100 cm 2 . The connection plates are made of high-temperature-resistant alloys by powder metallurgy. The fuel cell stack operates with hydrogen as the fuel and air as the oxidant. The inlet fuel and air temperatures are controlled at 750 °C, and the outlet fuel and air temperatures are 950 °C. When operating at an average cell voltage of 0.85 V, the output power of a single repeating unit reaches 50 W, and the output of a 30-repeating-unit fuel cell stack reaches 1500 W. The fuel utilization rate reaches 85%, and the air excess ratio is 4.05.

[0048] Application Example (2):

[0049] The first flat plate battery 21 uses ScSZ as the electrolyte, is supported by Ni-3YSZ, has Ni-ScSZ as the active anode, GDC as the barrier layer, and GDC and La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-dAs a composite cathode, the operating temperature is 700 ° C; the second flat battery 22 uses YSZ as the electrolyte, Ni-3YSZ for support, Ni-YSZ as the active anode, YSZ and La 0.8 Sr 0.2 MnO 3-d As a composite cathode, the operating temperature is 800°C. The electrolyte membrane thickness of the first flat-plate battery 21 and the second flat-plate battery 22 are both 10 microns, the supporting anode thickness is 400 microns, and the cathode effective area is 81 cm 2 , the battery size is 10×10=100cm 2 The connecting plate is made of Crofer 22 alloy plate and is manufactured by etching. The stack operates with hydrogen as fuel and air as oxidant. The inlet fuel and air temperatures are controlled at 650°C, and the outlet fuel and air temperatures are 850°C. When operating at an average operating voltage of 0.85V per cell, the output power of a single repeating unit reaches 80W, and the output of a stack of 50 repeating units reaches 4000W. The fuel utilization rate reaches 80%, and the air excess ratio is 3.81.

[0050] Application Examples (3):

[0051] The first planar battery 21 uses GDC as electrolyte, Ni-3YSZ as support, Ni-GDC as active anode, GDC and La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-d As a composite cathode, the operating temperature is 600 ° C; the second flat battery 22 uses ScSZ as the electrolyte, Ni-3YSZ for support, Ni-ScSZ as the active anode, GDC as the barrier layer, GDC and La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-d As a composite cathode, the operating temperature is 700 ℃ The electrolyte membrane thickness of the first flat-plate battery 21 and the second flat-plate battery 22 are both 10 microns, the supporting anode thickness is 400 microns, and the cathode effective area is 81 cm 2 , the battery size is 10×10=100cm 2 The connecting plate is made of Crofer 22 alloy plate and is manufactured by etching. The stack operates with hydrogen as fuel and air as oxidant. The inlet fuel and air temperatures are controlled at 550°C, and the outlet fuel and air temperatures are 750°C. When operating at an average operating voltage of 0.80V per cell, the output power of a single repeating unit reaches 60 W, and the output of a stack of 50 repeating units reaches 3000 W. The fuel utilization rate reaches 85%, and the air excess ratio is 4.05.

[0052] Application Examples (4):

[0053] The first planar battery 21 uses ScSZ as electrolyte (film thickness 10 μm), Ni-3YSZ as support (300 μm), Ni-ScSZ as active anode, GDC as barrier layer, GDC and La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-d As a composite cathode, the operating temperature is 700°C; the second flat battery 22 uses La 0.8 Sr 0.2 Ga 0.9 Mg 0.1 O 3-d (LSGM) as the electrolyte, an electrolyte support structure (film thickness 310 μm), Ni-GDC as the active anode, GDC as the barrier layer, GDC and La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-d As a composite cathode, the operating temperature is 800°C. The cathode effective area of ​​the first flat battery 21 and the second flat battery 22 is 81cm 2 , the battery size is 10×10=100cm 2 The connecting plate is made of Crofer22 alloy plate by etching. The fuel stack uses hydrogen as fuel and air as oxidant. The inlet fuel and air temperature are controlled at 650℃ and the outlet fuel and air temperature are controlled at 850℃. ℃ When operating at an average voltage of 0.85V per cell, the output power of a single repeating unit reaches 55 W, and the output of a stack of 50 repeating units reaches 2500 W. The fuel utilization rate reaches 82%, and the air excess ratio is 3.95.

[0054] Application Examples (5):

[0055] The first planar battery 21 is made of BaZr 0.4 Ce 0.4 Y 0.1 Yb 0.1 O 3-d (BZCYYb) is the electrolyte, supported by Ni-3YSZ, Ni-BZCYYb is the active anode, PrBaCo 1.5 Fe 0.5 O 6-dAs the cathode, the working temperature is 600 ℃; the second flat battery 22 uses ScSZ as the electrolyte, Ni-3YSZ for support, Ni-ScSZ as the active anode, GDC as the barrier layer, GDC and La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-d As a composite cathode, the operating temperature is 700°C. The electrolyte membrane thickness of the first flat-plate battery 1 and the second flat-plate battery 22 are both 10 microns, the supporting anode thickness is 400 microns, and the cathode effective area is 81 cm 2 , the battery size is 10×10=100cm 2 . The connecting plate is made of 430 stainless steel plate by etching, and the cathode side is plasma sprayed with MnCo2O4 spinel coating, and the anode side is sprayed with Ni coating. The stack operates with hydrogen as fuel and air as oxidant. The inlet fuel and air temperature are controlled at 550℃, and the outlet fuel and air temperature is 750℃. When operating at an average operating voltage of 0.80V per chip, the output power of a single repeating unit reaches 70 W, and the output of a stack of 50 repeating units reaches 3500 W. The fuel utilization rate reaches 85%, and the air excess ratio is 4.05.

[0056] The above embodiment is only a preferred solution of the present invention and is not limited thereto. Based on this, targeted adjustments can be made according to actual needs to obtain different implementation methods. For example, on the same connecting plate, based on the first battery area and the second battery area, a third battery area and a fourth battery area connected along the arrangement direction are further added, and so on. Since there are many possible implementation methods, we will not illustrate them one by one here.

[0057] The traditional method of operating multiple battery stacks in series actually involves connecting multiple batteries of the same type in series to increase power generation. In contrast, the present invention utilizes two flat-plate single cells with operating temperatures approximately 100°C apart, sealing them to a common metal connecting plate. This maintains unimpeded airflow in the direction of the two cells' arrangement, allowing the exhaust from the first flat-plate cell to serve as the air intake for the second flat-plate cell, forming a repeating unit with a progressive structure. This repeating unit is then collected in series using a cathode current collector to create a battery stack. In other words, the present invention arranges two battery cells with different electrolytes in a front-and-rear arrangement on a common connecting plate, which itself forms a single battery.

[0058] The working characteristic of this fuel cell stack is that the fuel gas and air flow in a co-current manner, so that the air flow temperature from the air inlet to the air outlet increases successively, but the temperature difference between the fuel side and the air side of the local battery is kept within an acceptable range. Although the temperature change along the direction of air flow is relatively large, the flow path is also correspondingly lengthened, so that the temperature gradient in the direction of the flow path is maintained within an acceptable range.

[0059] Since two batteries with different operating temperatures are used and the system operates in a downstream mode with a progressive temperature increase, the remaining fuel after the first battery generates electricity can be used in the second battery, significantly improving fuel utilization. At the same time, since the temperature difference between the air at the inlet and outlet of the fuel cell stack can be as high as 200°C or more, the air flow required to carry away the same heat generated by the fuel cell stack is about half that of a traditional fuel cell stack. As a result, when using this fuel cell stack integrated system, the parasitic power of the air pump is significantly reduced, and the system efficiency is improved, which is particularly suitable for the needs of green hydrogen power generation.

[0060] The above is a detailed introduction to the high temperature difference solid oxide fuel cell stack provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A high temperature difference solid oxide fuel cell stack comprising a plurality of repeating units, each of which comprises a connecting plate and a flat cell, wherein the flat cell is sealed and connected to the connecting plate, characterized in that: A first cell area and a second cell area are respectively provided on both sides of the connecting plate of each repeating unit, wherein the first cell area and the second cell area on one side are provided with anode ribs and are connected along the arrangement direction through a fuel connection channel, and the first cell area and the second cell area on the other side are provided with cathode ribs and are connected along the arrangement direction through an air connection channel; the first cell area and the second cell area provided with anode ribs are provided with first and second flat-plate batteries with different rated operating temperatures, and the rated operating temperature of the second flat-plate battery is higher than the rated operating temperature of the first flat-plate battery.

2. The high temperature difference solid oxide fuel cell stack according to claim 1, characterized in that: The inlet rated operating temperature of the second planar battery is equal to the outlet rated operating temperature of the first planar battery.

3. The high temperature difference solid oxide fuel cell stack according to claim 2, characterized in that: The difference between the rated operating temperatures of the first and second planar batteries is 80° C.-120° C., and the difference between the outlet rated operating temperature of the second planar battery and the inlet rated operating temperature of the first planar battery is 160° C.-240° C.

4. The high temperature difference solid oxide fuel cell stack according to claim 3, characterized in that: The difference between the rated operating temperatures of the first and second planar batteries is about 100° C., and the difference between the outlet rated operating temperature of the second planar battery and the inlet rated operating temperature of the first planar battery is about 200° C.

5. The high temperature difference solid oxide fuel cell stack according to claim 1, characterized in that: The anode ribs and cathode ribs of the first battery area are parallel to each other, the anode ribs and cathode ribs of the second battery area are parallel to each other, the anode ribs of the first battery area correspond to the anode ribs of the second battery area in the downstream direction, and the cathode ribs of the first battery area correspond to the cathode ribs of the second battery area in the downstream direction.

6. The high temperature difference solid oxide fuel cell stack according to claim 5, characterized in that: The anode ribs and the cathode ribs in the first battery region are staggered in the projection direction, and the anode ribs and the cathode ribs in the second battery region are staggered in the projection direction.

7. The high temperature difference solid oxide fuel cell stack according to claim 1, characterized in that: The first and second planar batteries are sealed with edges of the first and second battery regions by sealing rings. The sealing rings are double-layer structures, including a glass sealing ring and a metal sealing ring provided on the glass sealing ring.

8. The high temperature difference solid oxide fuel cell stack according to claim 7, characterized in that: The sealing ring includes a lateral portion covering the fuel connection passage and the air connection passage.

9. The high temperature difference solid oxide fuel cell stack according to any one of claims 1 to 8, characterized in that: The connecting plate is a metal connecting plate, one end of which is provided with a fuel inlet and an air outlet arranged alternately, and the other end is provided with a fuel outlet and an air inlet arranged alternately; the fuel inlet and the fuel outlet are staggered, and both are connected to the fuel channel formed between the anode ribs; the air inlet and the air outlet are staggered, and both are connected to the air channel formed between the cathode ribs.

10. The high temperature difference solid oxide fuel cell stack according to claim 9, characterized in that: The first planar battery and the second planar battery each include an anode, an electrolyte membrane, a cathode, and a cathode current collector disposed on the cathode.

Images