Flat plate type SOFC single battery multi-mode working performance test tool

Abstract

The invention discloses a flat plate type SOFC (solid oxide fuel cell) single cell multi-mode working performance testing tool, and particularly relates to the technical field of solid oxide fuel cell testing. The cathode side tool and the anode side tool can test the power generation performance of the to-be-tested single cell, the temperature sampling channel can test the temperature field distribution of the to-be-tested single cell, and the oxygen partial pressure gas collection channel can test the leakage and blow-by characteristics of the to-be-tested single cell. A second air inlet channel, a second air exhaust channel, a fuel gas inlet channel and a fuel gas exhaust channel port are matched with an interface of a cell stack mounting base of a cell stack test system, so that the compatibility of a single cell tool on the cell stack test system is realized; prefabricated flow channel connectors can be designed and manufactured according to different cell stack flow channels, electrical performance testing of a single cell under the condition of distribution of multiple flow channel gas flow fields is achieved, and a cell stack flow field optimization design verification platform function is achieved.

Description

Technical Field

[0001] This invention relates to the field of solid oxide fuel cell testing technology, specifically a flat-plate SOFC single-cell multi-mode performance testing fixture. Background Technology

[0002] Solid oxide fuel cells (SOFCs) are all-solid-state fuel cells consisting of a three-layer structure: anode, electrolyte, and cathode. Their working principle is as follows: In a high-temperature environment suitable for electrolyte operation, fuel gas, such as hydrogen or methanol reformate, is supplied to the anode, while air or oxygen is supplied to the cathode. Oxygen is reduced to oxygen ions at the cathode, and these ions conduct through holes in the electrolyte from the cathode to the anode. At the anode, the fuel gas combines with the oxygen ions to generate water and carbon dioxide, while simultaneously releasing electrons to form a voltage in the external circuit. A single cell in a planar SOFC has a planar structure, consisting of three layers: anode side, electrolyte side, and cathode side. The most common application is the stacking of multiple cells to form a complete fuel cell stack, achieving high power output and enabling practical applications. However, a problem with fuel cell stacks is that if even one cell in the stack is damaged, the entire stack will fail, preventing power output. Therefore, ensuring the quality of individual cells is crucial. To guarantee cell quality, performance testing of individual cells is necessary during production, a crucial step in quality inspection during cell development and mass production.

[0003] Traditional large-size flat-plate SOFC test fixtures are independent structures, including fuel and air intake and exhaust interfaces. However, the gas supply system of the battery stack is provided by the base, and its interface is completely different from that of traditional single-cell test fixtures. This results in the incompatibility of traditional single-cell fixtures with the battery stack measurement system at the component level, requiring independent gas control units and electrical performance data acquisition units. This leads to a surge in equipment costs and is not conducive to large-scale production. Secondly, once the design of traditional fixtures is finalized, its gas flow channels are fixed. However, in the design of battery stacks, the flow channel design varies for different applications, and flow channel optimization is an important aspect that requires timely changes. The inconsistency between the flow channels of traditional single-cell test fixtures and battery stack flow channels leads to significant differences between the measured data of a single cell and its performance in the actual battery stack, and is not conducive to the iterative optimization of battery stack flow channels. Thirdly, traditional single-cell test fixtures can only test the power generation performance of a single cell, and cannot test the temperature field distribution or gas leakage characteristics of a single cell, resulting in an insufficient comprehensive evaluation of the overall performance of a single cell. Therefore, we propose a flat-plate SOFC single-cell multi-mode operating performance test fixture and method to solve the above problems. Summary of the Invention

[0004] The purpose of this invention is to provide a flat-panel SOFC single-cell multi-mode performance testing fixture to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A planar SOFC single-cell multi-mode operating performance testing fixture is provided, which is capable of single-cell power generation performance testing, single-cell temperature field distribution testing, and single-cell leakage and gas leakage characteristic testing. The specific structure includes a cathode-side fixture, an anode-side fixture is provided at the bottom of the cathode-side fixture, and a detachable single cell to be tested is installed between the cathode-side fixture and the anode-side fixture. A cathode-side flow channel is opened at the center of the bottom of the cathode-side fixture. A temperature sampling channel for testing the temperature field distribution of the single cell to be tested is provided at the bottom of the cathode-side flow channel. A first air inlet channel and a first air exhaust channel connected to the cathode-side flow channel are respectively installed on both sides of the bottom of the cathode-side fixture. The bottom center of the anode-side fixture has a flow channel cavity. The top two sides of the anode-side fixture have symmetrically opened fuel gas inlet channels and fuel gas exhaust channels that are connected to the flow channel cavity. The bottom of the flow channel cavity has a detachable prefabricated flow channel connector. The other two sides of the top of the anode-side fixture have symmetrically opened second air inlet channels and second air exhaust channels. The outside of the anode-side fixture has an oxygen partial pressure sampling channel that runs through the fuel gas exhaust channel. A gas sampling tube can be inserted into the outside of the oxygen partial pressure sampling channel for testing the leakage and gas leakage characteristics of the single cell under test.

[0006] Preferably, the ports of the fuel gas inlet channel, fuel gas exhaust channel, second air inlet channel, and second air exhaust channel on the top of the anode-side tooling are matched with the corresponding channel interfaces of the battery stack mounting base of the battery stack testing system.

[0007] Preferably, the ports of the second air intake channel and the second air exhaust channel opened at the top of the anode-side tooling are adapted to the size of the interfaces of the first air intake channel and the first air exhaust channel opened at the bottom of the cathode-side tooling, and the second air intake channel and the second air exhaust channel can be connected to the first air intake channel and the first air exhaust channel.

[0008] Preferably, the single cell under test is disposed on the top of the prefabricated flow channel connector, and the two sides of the prefabricated flow channel connector are in contact with the bottom of the flow channel cavity and the anode side surface of the single cell under test, respectively. The cathode side flow channel can contact the cathode side surface of the single cell under test, and the top of the single cell under test can be provided with a flexible conductive connection structure that can increase conductivity.

[0009] Preferably, a second sealing element mounting position is provided on the top of the anode-side tooling at a position corresponding to the flow channel cavity, and an insulating anode-side sealing element is provided on the top of the second sealing element mounting position.

[0010] Preferably, an anode electrical lead-out terminal is installed on the outer side of the anode-side fixture near the second air exhaust channel, and a cathode electrical lead-out terminal is installed on the outer side of the cathode-side fixture near the anode electrical lead-out terminal. Both the cathode electrical lead-out terminal and the anode electrical lead-out terminal are matched with the electrical performance acquisition interface of the battery stack measurement system.

[0011] Preferably, a thermocouple is provided inside the temperature sampling channel, and the size of the temperature sampling channel matches the specifications of the thermocouple. A first sealing element mounting position is provided at the bottom of the cathode-side tooling, and an insulating cathode-side seal is installed at the bottom of the first sealing element mounting position.

[0012] Preferably, handles are symmetrically installed on the outer sides of the anode-side tooling, corresponding to the fuel gas inlet channel and the fuel gas exhaust channel.

[0013] Preferably, both the cathode-side seal and the anode-side seal are made of multi-layered mica paper.

[0014] Preferably, the cathode-side tooling can be tightly fitted with the anode-side tooling.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This is a planar SOFC single-cell multi-mode performance testing fixture. Traditional fixtures are for testing the power generation performance of a single cell and can only test the power generation performance of a single cell. In addition to testing the power generation performance of a single cell through the upper and lower cathode-side fixtures and anode-side fixtures, this application can also simultaneously test the temperature field distribution, leakage, and gas leakage characteristics of a single cell through the temperature sampling channel outside the cathode-side fixture and the oxygen partial pressure gas collection channel on the anode-side fixture. By replacing different prefabricated flow channel connectors, the influence of the flow channel on the gas flow field distribution and the electrical performance of the single cell can be verified. The multi-parameter acquisition and testing functions, as well as the modular replacement function of the flow channel, of this application are not available in traditional single-cell testing fixtures. It has important engineering significance in the research, development, optimization, and quality control of single cells and battery stacks and represents a significant and substantial advancement.

[0016] 2. This flat-plate SOFC single-cell multi-mode performance testing fixture differs from traditional fixtures, which have their own air and fuel gas inlet and outlet channels, making them incompatible with battery stack testing systems. Traditional fixtures require specialized inlet and outlet control systems, current and voltage acquisition systems, and auxiliary systems such as pneumatic clamping devices to perform single-cell electrical performance testing. In contrast, the ports of the second air inlet channel, second air outlet channel, fuel gas inlet channel, and fuel gas outlet channel in this application are compatible with the battery stack testing system. Simply installing this fixture on the battery stack mounting base of the testing system enables the multi-parameter acquisition and testing functions described in this application. This offers significant advantages in terms of equipment cost, equipment operation and maintenance, and personnel skills training.

[0017] 3. This is a multi-mode performance testing fixture for a flat-plate SOFC single cell. Traditional fixtures have a single function and can only test power generation performance in the forward direction: air and fuel gas enter the cathode and anode sides of the single cell respectively through the air intake channel, and power generation is carried out in the mode of fuel oxidation. The fixture provided in this application can not only work in fuel cell power generation mode, but also in electrolysis cell mode. High-temperature water vapor or a mixture of water vapor and carbon dioxide is introduced into the fuel gas intake channel, and DC voltage is connected to the anode and cathode (the anode is connected to the negative electrode and the cathode is connected to the positive electrode) to electrolyze the water vapor and the mixture of water vapor and carbon dioxide. The fuel gas exhaust channel discharges hydrogen or hydrogen and methane, and the cathode exhaust channel discharges high-purity oxygen. By collecting voltage, current, anode side air intake volume, anode and cathode exhaust components and flow rate, combined with the temperature field distribution testing system, the single cell electrolysis hydrogen production performance or co-electrolysis hydrogen and methane production performance can be accurately tested. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the structure of the split diagram in this invention; Figure 3 This is a schematic diagram of the cathode-side tooling in this invention; Figure 4 This is a schematic diagram of the anode-side tooling in this invention; Figure 5 This is a schematic diagram of the anode-side tooling from another angle in this invention; Figure 6This is a schematic diagram of the cross-sectional structure of the anode-side tooling in this invention.

[0020] In the diagram: 1. Cathode-side fixture; 2. Cathode-side seal; 3. Anode-side fixture; 4. Anode-side seal; 5. Single cell under test; 6. Flexible conductive connection structure; 8. First air intake channel; 9. Cathode-side flow channel; 10. First air exhaust channel; 11. Temperature sampling channel; 12. First seal mounting position; 13. Cathode electrical lead-out terminal; 14. Fuel gas intake channel; 15. Flow channel cavity; 16. Fuel gas exhaust channel; 17. Second air intake channel; 18. Second air exhaust channel; 19. Oxygen partial pressure sampling channel; 20. Second seal mounting position; 21. Anode electrical lead-out terminal; 22. Handle; 23. Prefabricated flow channel connector. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Example 1 like Figures 1-6 As shown, this is the first embodiment of the present invention. This embodiment provides a planar SOFC single cell multi-mode working performance testing fixture, which is capable of single cell power generation performance testing, single cell temperature field distribution testing, and single cell leakage and gas leakage characteristic testing. The specific structure includes a cathode side fixture 1, an anode side fixture 3 is provided at the bottom of the cathode side fixture 1, a detachable single cell 5 to be tested is installed between the cathode side fixture 1 and the anode side fixture 3, a cathode side flow channel 9 is opened at the center of the bottom of the cathode side fixture 1, a temperature sampling channel 11 is provided at the bottom of the cathode side flow channel 9 for testing the temperature field distribution of the single cell 5 to be tested, and a first air intake channel 8 and a first air exhaust channel 10 connected to the cathode side flow channel 9 are respectively installed on both sides of the bottom of the cathode side fixture 1. A flow channel cavity 15 is provided at the bottom center of the anode-side fixture 3. Fuel gas inlet channel 14 and fuel gas exhaust channel 16, which are both connected to the flow channel cavity 15, are symmetrically provided on both sides of the top of the anode-side fixture 3. A detachable prefabricated flow channel connector 23 is provided at the bottom of the flow channel cavity 15. A second air inlet channel 17 and a second air exhaust channel 18 are symmetrically provided on the other two sides of the top of the anode-side fixture 3. An oxygen partial pressure sampling channel 19, which runs through the fuel gas exhaust channel 16, is provided on the outside of the anode-side fixture 3. A gas sampling tube can be inserted into the outside of the oxygen partial pressure sampling channel 19 for testing the leakage and gas leakage characteristics of the single cell 5 under test.

[0023] It should be noted that in this embodiment, the single cell under test 5 is installed between the upper and lower parts of the cathode-side fixture 1 and the anode-side fixture 3 through a split structure, which enables the single cell power generation performance test of the single cell under test 5. Furthermore, the temperature field distribution test of the single cell under test 5 can be performed through the temperature sampling channel 11 on the cathode-side flow channel 9, and the single cell leakage and gas leakage characteristics test can be performed by inserting a gas sampling tube into the oxygen partial pressure sampling channel 19. This realizes the real-time measurement function of the correspondence between the single cell temperature field and electrical performance, saving costs and increasing work efficiency.

[0024] A further preferred method for connecting the anode-side fixture 3 is that the ports of the fuel gas inlet channel 14, fuel gas exhaust channel 16, second air inlet channel 17, and second air exhaust channel 18 on the top of the anode-side fixture 3 are matched with the corresponding channel interfaces of the battery stack mounting base of the battery stack test system.

[0025] The ports of the second air intake channel 17 and the second air exhaust channel 18 opened at the top of the anode side fixture 3 are adapted to the size of the interfaces of the first air intake channel 8 and the first air exhaust channel 10 opened at the bottom of the cathode side fixture 1, and the second air intake channel 17 and the second air exhaust channel 18 can be connected to the first air intake channel 8 and the first air exhaust channel 10.

[0026] It should be noted that in this embodiment, the ports of fuel gas inlet channel 14, fuel gas exhaust channel 16, second air inlet channel 17, and second air exhaust channel 18 are matched with the corresponding channel interfaces of the battery stack mounting base of the battery stack test system, which can realize the compatibility of single-cell tooling on the battery stack test system. The ports of second air inlet channel 17 and second air exhaust channel 18 are matched with the interfaces of first air inlet channel 8 and first air exhaust channel 10, which can be connected to the first air inlet channel 8 and first air exhaust channel 10. High-temperature water vapor or a mixture of water vapor and carbon dioxide is introduced into fuel gas inlet channel 14, and DC voltage is connected to the anode and cathode to electrolyze the mixture of water vapor and carbon dioxide. The fuel gas exhaust channel 16 discharges hydrogen or hydrogen and methane, and the first air exhaust channel 10 discharges high-purity oxygen.

[0027] Based on the above, the matching of each channel with the corresponding channel interface of the battery stack mounting base of the battery stack test system can realize the compatibility of single cell tooling on the battery stack test system, saving equipment costs and reducing equipment operation and maintenance. By collecting voltage, current, anode side air intake, anode and cathode exhaust components and flow rate, the single cell electrolysis hydrogen production performance or co-electrolysis hydrogen and methane production performance can be accurately tested.

[0028] More specifically, the single cell under test 5 is placed on top of the prefabricated flow channel connector 23. The two sides of the prefabricated flow channel connector 23 are in contact with the bottom of the flow channel cavity 15 and the anode side surface of the single cell under test 5, respectively. The cathode side flow channel 9 can be in contact with the cathode side surface of the single cell under test 5. The top of the single cell under test 5 can be provided with a flexible conductive connection structure 6 that can increase conductivity.

[0029] A second sealing element mounting position 20 is provided on the top of the anode side tooling 3 at a position corresponding to the flow channel cavity 15, and an insulating anode side sealing element 4 is provided on the top of the second sealing element mounting position 20.

[0030] An anode electrical lead-out terminal 21 is installed on the outer side of the anode-side fixture 3 near the second air exhaust channel 18, and a cathode electrical lead-out terminal 13 is installed on the outer side of the cathode-side fixture 1 near the anode electrical lead-out terminal 21. Both the cathode electrical lead-out terminal 13 and the anode electrical lead-out terminal 21 are matched with the electrical performance acquisition interface of the battery stack measurement system.

[0031] It should be noted that in this embodiment, the influence of the flow channel on the gas flow field distribution and the electrical performance of a single cell can be verified by replacing different prefabricated flow channel connectors 23. The conductivity can be increased by using flexible conductive connection structures 6 (such as silver mesh, conductive coating, etc.). The flow channel form of the prefabricated flow channel connector 23 is consistent with the flow channel design of the battery stack, and is used to verify the influence of different flow channels on the electrical performance of a single cell. The cathode lead-out terminal 13 and the anode lead-out terminal 21 are both matched with the electrical performance acquisition interface of the battery stack measurement system, which is conducive to performing various tests on the single cell 5 under test. The anode side tooling 3 has a flow channel cavity 15, which can be used to manufacture prefabricated flow channel connectors 23 according to different battery stack flow channel designs, realize the single cell electrical performance test under various flow channel gas flow field distribution conditions, and have the function of battery stack flow field optimization design verification platform.

[0032] Furthermore, a temperature sampling channel 11 is equipped with a thermocouple, the size of which matches the specifications of the thermocouple. A first sealing element mounting position 12 is provided at the bottom of the cathode-side fixture 1, and an insulating cathode-side sealing element 2 is installed at the bottom of the first sealing element mounting position 12.

[0033] Handles 22 are symmetrically installed on the outer sides of the anode-side tooling 3, corresponding to the fuel gas inlet channel 14 and the fuel gas exhaust channel 16.

[0034] Both the cathode-side seal 2 and the anode-side seal 4 are made of multi-layered mica paper.

[0035] The cathode-side fixture 1 can fit tightly against the anode-side fixture 3.

[0036] It should be noted that, in this embodiment, the temperature sampling channel 11 is equipped with a thermocouple for testing the temperature field distribution of the single cell 5 under test. The handle 22 allows for easy gripping, overall handling, and movement of the upper and lower tooling and single cell assembly. Both the cathode side seal 2 and the anode side seal 4 are made of multi-layer mica paper, which has the characteristics of high temperature resistance and a certain amount of compression, enabling high-temperature compression sealing. They are also easy to disassemble and clean, and the tooling can be reused with good accuracy.

[0037] In summary, this planar SOFC single-cell multi-mode performance testing fixture is used as follows: First, the anode-side fixture 3 is placed horizontally on the worktable. Then, the anode-side seal 4 is installed on the second seal mounting position 20. Next, the prefabricated flow channel connector 23 is installed at the bottom of the flow channel cavity 15. The anode side of the single cell 5 to be tested is then placed facing the prefabricated flow channel connector 23. Next, the cathode-side seal 2 is installed on the first seal mounting position 12 on the cathode-side fixture 1. Then, the cathode-side fixture 1 is installed on the anode-side fixture 3, with the cathode side of the single cell 5 to be tested facing the cathode-side fixture 1. Then, the assembled upper and lower fixtures, along with the single cell 5 to be tested, can be pulled into the high-temperature environment chamber of the battery stack testing system by pulling the handle 22. The fixtures are then installed on the battery stack testing base according to the corresponding interfaces. Finally, a thermocouple is inserted into the temperature sampling channel 11 of the cathode-side fixture 1, sealed with high-temperature sealant, and the leads are arranged. The cathode-side fixture 1 can then be used to test the single cell 5. Apply appropriate clamping force to the surface to ensure that the end faces of cathode-side fixture 1 and anode-side fixture 3 are pressed tightly together. Then, insert a gas sampling tube into the oxygen partial pressure sampling channel 19 on the anode-side fixture 3 and connect the thermocouple to the temperature monitoring instrument of the battery stack test system. Connect the gas sampling tube at the oxygen partial pressure sampling channel 19 to the oxygen partial pressure tester or anode gas sampling system of the battery stack test system. Connect the cathode electrical lead-out terminal 13 to the anode electrical lead-out terminal 21 and the positive and negative terminals of the battery stack test system. Then, close the high-temperature environment chamber furnace door and heat up to the single cell operating temperature. Perform activation and electrical performance testing according to the single cell test procedure, and simultaneously record the electrical performance data of the single cell 5 under test, the temperature changes in each temperature zone of the single cell 5 under test, and the changes in oxygen partial pressure on the anode side. This provides data for the comprehensive performance analysis, temperature field analysis, and gas flow field analysis of the single cell 5 under test, thereby enabling multiple tests to be performed simultaneously and saving costs.

[0038] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A planar SOFC single-cell multi-mode performance testing fixture, capable of single-cell power generation performance testing, single-cell temperature field distribution testing, and single-cell leakage and gas leakage characteristic testing, characterized in that: The specific structure includes a cathode-side fixture (1), an anode-side fixture (3) is provided at the bottom of the cathode-side fixture (1), a detachable single cell to be tested (5) is installed between the cathode-side fixture (1) and the anode-side fixture (3), a cathode-side flow channel (9) is provided at the center of the bottom of the cathode-side fixture (1), a temperature sampling channel (11) for testing the temperature field distribution of the single cell to be tested (5) is provided at the bottom of the cathode-side flow channel (9), and a first air intake channel (8) and a first air exhaust channel (10) connected to the cathode-side flow channel (9) are respectively installed on both sides of the bottom of the cathode-side fixture (1). The bottom center of the anode-side fixture (3) is provided with a flow channel cavity (15). The top two sides of the anode-side fixture (3) are symmetrically provided with a fuel gas inlet channel (14) and a fuel gas exhaust channel (16) that are connected to the flow channel cavity (15). The bottom of the flow channel cavity (15) is provided with a detachable prefabricated flow channel connector (23). The other two sides of the top of the anode-side fixture (3) are symmetrically provided with a second air inlet channel (17) and a second air exhaust channel (18). The outside of the anode-side fixture (3) is provided with an oxygen partial pressure sampling channel (19) that runs through the fuel gas exhaust channel (16). A gas sampling tube can be inserted into the outside of the oxygen partial pressure sampling channel (19) to test the leakage and gas leakage characteristics of the single cell (5) under test.

2. The multi-mode performance testing fixture for a flat-panel SOFC single cell according to claim 1, characterized in that: The ports of the fuel gas inlet channel (14), fuel gas exhaust channel (16), second air inlet channel (17), and second air exhaust channel (18) on the top of the anode side tooling (3) are matched with the corresponding channel interfaces of the battery stack mounting base of the battery stack test system.

3. The multi-mode performance testing fixture for a flat-panel SOFC single cell according to claim 2, characterized in that: The ports of the second air intake channel (17) and the second air exhaust channel (18) opened at the top of the anode side fixture (3) are adapted to the size of the interfaces of the first air intake channel (8) and the first air exhaust channel (10) opened at the bottom of the cathode side fixture (1), and the second air intake channel (17) and the second air exhaust channel (18) can be connected to the first air intake channel (8) and the first air exhaust channel (10).

4. The multi-mode performance testing fixture for a flat-panel SOFC single cell according to claim 3, characterized in that: The single cell under test (5) is placed on top of the prefabricated flow channel connector (23). The two sides of the prefabricated flow channel connector (23) are in contact with the bottom of the flow channel cavity (15) and the anode side surface of the single cell under test (5), respectively. The cathode side flow channel (9) can contact the cathode side surface of the single cell under test (5). The top of the single cell under test (5) can be provided with a flexible conductive connection structure (6) that can increase conductivity.

5. The multi-mode performance testing fixture for a flat-panel SOFC single cell according to claim 4, characterized in that: The top of the anode-side tooling (3) is provided with a second sealing element mounting position (20) corresponding to the flow channel cavity (15), and an insulating anode-side sealing element (4) is provided on the top of the second sealing element mounting position (20).

6. The multi-mode performance testing fixture for a flat-panel SOFC single cell according to claim 5, characterized in that: An anode electrical lead-out terminal (21) is installed on the outer side of the anode-side fixture (3) near the second air exhaust channel (18), and a cathode electrical lead-out terminal (13) is installed on the outer side of the cathode-side fixture (1) near the anode electrical lead-out terminal (21). Both the cathode electrical lead-out terminal (13) and the anode electrical lead-out terminal (21) are matched with the electrical performance acquisition interface of the battery stack measurement system.

7. The multi-mode performance testing fixture for a flat-panel SOFC single cell according to claim 6, characterized in that: The temperature sampling channel (11) is equipped with a thermocouple. The size of the temperature sampling channel (11) matches the specifications of the thermocouple. The bottom of the cathode-side fixture (1) is provided with a first sealing element mounting position (12). An insulating cathode-side seal (2) is installed at the bottom of the first sealing element mounting position (12).

8. The multi-mode performance testing fixture for a flat-panel SOFC single cell according to claim 7, characterized in that: Handles (22) are symmetrically installed on the outer sides of the anode side tooling (3) corresponding to the fuel gas inlet channel (14) and the fuel gas exhaust channel (16).

9. The multi-mode performance testing fixture for a flat-panel SOFC single cell according to claim 8, characterized in that: Both the cathode-side seal (2) and the anode-side seal (4) are made of multi-layered mica paper.

10. The multi-mode performance testing fixture for a flat-panel SOFC single cell according to claim 9, characterized in that: The cathode-side fixture (1) can be tightly fitted with the anode-side fixture (3).

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