Method and device for testing current distribution of flat plate type solid oxide fuel cell

Abstract

The invention discloses a method and a device for testing current distribution of a flat plate type solid oxide fuel cell. The testing method comprises the following steps: S1, carrying out non-destructive partitioning on the cell; s2, lateral current control between the partitions is carried out; s3, the partitions are insulated from the clamp; s4, performing partition current acquisition and work control; and S5, data post-processing is carried out, the testing device comprises a modular shell mechanism, a Hall sensor array and a PCB assembly, the modular shell mechanism comprises a device shell and a wiring assembly, the Hall sensor array comprises a Hall current sensor and a Hall current sensor direct-current power source, and the PCB assembly comprises a power supply line assembly and a data connection assembly. Compared with the prior art, the method has the beneficial effects that an innovative battery partition test method is combined with Hall current sensor measurement, non-destructive, easy-to-implement and adjustable partition representation of the battery is realized, each partition is always kept in equipotential work in the measurement process, and a current distribution rule of the battery in a real service state can be obtained.

Description

Technical Field

[0001] The present invention belongs to the field of fuel cell testing, and specifically relates to a method and device for testing the current distribution of a planar solid oxide fuel cell. Background Art

[0003] The consistency of the performance distribution of SOFC is a key issue for fuel cell to optimize its design and to work stably and efficiently. The test results of the performance of SOFC can reveal the complex relationship between the battery materials, preparation methods and their performance, so as to determine the sources of various losses inside the battery, and thus can further promote the efficient preparation and effective research and development of the battery.

[0004] Currently, many current testing methods for fuel cells have been invented by relevant personnel. Commonly used methods include: printed circuit board method, battery block testing method based on electrically insulated segmented current collector plates, sub-cell method based on sub-cell structure, method of inversely calculating current density based on battery potential distribution measurement, method of multiple electronic loads or multi-channel potentiostats, and parallel resistance method, etc. However, these methods have many problems: the sub-cell method changes the traditional fuel cell structure and requires special preparation, increasing the cost; at the same time, the differences that occur during the preparation of each sub-cell will have a great impact on the test, resulting in an increase in error. The printed circuit board method requires embedding the PCB board into the battery flow field plate, changing the battery structure, and it is also difficult to apply in a high-temperature environment. There are still many obstacles in further promoting the experiment, which is also an important reason for the relatively few experimental studies on the current distribution of SOFC. Summary of the Invention

[0005] The purpose of the present invention is to provide a method and device for testing the current distribution of a planar solid oxide fuel cell to solve the above problems.

[0006] To achieve the above purpose, the present invention provides a method and device for testing the current distribution of a planar solid oxide fuel cell, including:

[0007] S1. Non-destructive partitioning of the battery:

[0008] The battery partitioning is achieved by dividing the electrode current collector network. For anode-supported and electrolyte-supported batteries, a current collector metal mesh is added between the cathode and the cathode fixture. For cathode-supported batteries, a current collector metal mesh is added between the anode and the anode fixture. The current collector metal mesh can be a silver mesh, a gold mesh, a platinum mesh or a nickel mesh. The current collector metal mesh is in close contact with the electrode. The current collector metal mesh is divided into multiple regions, and each region is led out by a separate wire to achieve battery partitioning. This partitioning method does not require separate processing or modification of the battery sheet, flow field plate and fixture, and has the advantages of convenience, easy implementation, low cost, etc.;

[0009] S2. Lateral current control between partitions:

[0010] A certain gap is maintained between the current-collecting metal meshes to reduce the lateral current between each partition. The electrode material at the gap can be removed to further reduce the lateral current. The high-temperature furnace is heated with a programmed temperature increase to soften the gasket and remove organic substances;

[0011] S3. Insulation between partitions and fixtures:

[0012] The divided current-collecting metal meshes and their wires need to be insulated from the fixtures;

[0013] S4. Partition current acquisition and working control:

[0014] The partition current acquisition is carried out by non-contact measurement through a Hall sensor array and transmitted to a computer through data acquisition. The partition current leads converge on a PCB circuit board assembly after passing through the Hall sensor array and are connected to an electronic load or an electrochemical workstation together. By controlling the working state of the battery through a single electronic load or an electrochemical workstation within the modular housing mechanism, it can ensure that each partition of the battery operates at an equipotential, and it is also convenient to implement.

[0015] S5. Post-data processing:

[0016] Export the data to plot the I-V curve and the current distribution map, and perform data processing and analysis on the experiment.

[0017] In one or more embodiments of the present invention, the multiple regions in S1 are more than two regions.

[0018] In one or more embodiments of the present invention, the gap between each partition in S2 is 0.2 mm or more, and in S2, insulation mica paper is used for insulating the electrode fixture and the current collector.

[0019] In one or more embodiments of the present invention, the non-contact measurement in S4 is to measure the current of each partition using a Hall current sensor.

[0020] In one or more embodiments of the present invention, the on / off of the current in a single region in S4 is controlled by using a pluggable terminal connection.

[0021] In one or more embodiments of the present invention, it includes:

[0022] Modular housing mechanism: including a device housing and a wiring component, and the wiring component is installed on the device housing;

[0023] Hall sensor array: including a Hall current sensor and a DC power supply for the Hall current sensor, and the DC power supply for the Hall current sensor is connected to the Hall current sensor;

[0024] PCB circuit board assembly: It includes a power supply line assembly and a data connection assembly, and the data connection assembly is connected to a Hall current sensor;

[0025] The Hall current sensor, the DC power supply of the Hall current sensor, and the PCB circuit board are all installed inside the device housing.

[0026] In one or more embodiments of the present invention, voltage connection holes and current connection holes are provided on both the front and back of the device housing.

[0027] In one or more embodiments of the present invention, the DC power supply of the Hall current sensor is connected to the PCB circuit board, and the Hall current sensor is installed on the PCB circuit board through a base.

[0028] In one or more embodiments of the present invention, a back current collecting hole is provided on the device housing, and a summary current collecting hole is provided on the back current collecting hole.

[0029] In one or more embodiments of the present invention, a wiring post is connected to the collecting current hole, and both ends of the wiring post are respectively connected to the summary current collecting hole and the back current collecting hole.

[0030] Compared with the prior art, the beneficial effects of the present invention are as follows: By combining the innovative battery partition test method with the measurement of the Hall current sensor, non-destructive, easy-to-implement, and adjustable partition characterization of the battery is achieved. At the same time, the partition current measurement has high accuracy, fast response, and simple control. During the measurement process, each partition always operates at an equal electric potential, and the current distribution law under the true service state of the battery can be obtained. In addition, this technology does not require separate design of the battery, flow field plate, and test fixture. The equipment is simple, the operation is convenient, and the experimental cost is low. It has important significance for in-depth research and testing of the current distribution characteristics of planar solid oxide fuel cells, and has good application prospects in scientific research and industrial applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a flowchart of the fuel cell partition test system for the method and device of testing the current distribution of planar solid oxide fuel cells in an embodiment of the present invention;

[0032] Figure 2 It is a schematic diagram of single-cell partition for the method and device of testing the current distribution of planar solid oxide fuel cells in an embodiment of the present invention;

[0033] Figure 3 It is an insulation diagram of the cathode-side fixture for the method and device of testing the current distribution of planar solid oxide fuel cells in an embodiment of the present invention;

[0034] Figure 4Fuel cell assembly diagram of the method and device for testing the current distribution of a flat - type solid oxide fuel cell in an embodiment of the present invention;

[0035] Figure 5 Schematic diagram of the test device for the method and device for testing the current distribution of a flat - type solid oxide fuel cell in an embodiment of the present invention;

[0036] Figure 6 Layout diagram of Hall current sensors for the method and device for testing the current distribution of a flat - type solid oxide fuel cell in an embodiment of the present invention;

[0037] Figure 7 Flow chart of the test method and the use of the test device for the method and device for testing the current distribution of a flat - type solid oxide fuel cell in an embodiment of the present invention;

[0038] Figure 8 I - V diagram of the test single cell of the present invention for the method and device for testing the current distribution of a flat - type solid oxide fuel cell in an embodiment of the present invention;

[0039] Figure 9 Current distribution diagram of the test single cell of the present invention for the method and device for testing the current distribution of a flat - type solid oxide fuel cell in an embodiment of the present invention.

[0040] Explanation of main reference numerals:

[0041] 1 - Cathode side of the fixture, 2 - First gasket, 3 - Insulating mica paper, 4 - Cathode current collector, 5 - Single - cell cathode, 6 - Single - cell anode, 7 - Current - collecting nickel mesh, 8 - Current - collecting silver mesh, 9 - Second gasket, 10 - Anode - side fixture, 15 - Single cell, 16 - Connection test device, 17 - High - temperature furnace hearth, 18 - Voltage wire, 19 - Anode voltage wire, 20 - Anode current wire, 21 - Cathode - side air, 22 - Anode - side hydrogen, 23 - Electronic load, 24 - Data acquisition instrument, 25 - Computer terminal, 26 - Left - hand current - collecting hole, 27 - Back - side current - collecting hole, 28 - Large window, 29 - PCB circuit board, 30 - Hall current sensor, 31 - Battery lead wiring hole, 34 - Test device data output interface, 36 - Small window, 37 - DC power supply for Hall current sensor, 38 - Copper column, 39 - Current - collecting plate, 41 - Signal convergence output hole, 42 - Hall current sensor output signal hole. Detailed implementation manners

[0042] The following combines the accompanying drawings to describe in detail the specific implementation manners of the present invention. It should be understood that the protection scope of the present invention is not limited by the specific implementation manners.

[0043] The present invention discloses a test method and a test device for the current distribution of a single cell of a planar solid oxide fuel cell. This test method is applicable to planar solid oxide fuel cells and anode-supported solid oxide fuel cells. For electrolyte-supported and cathode-supported planar solid oxide fuel cells, this device is also applicable.

[0044] This test method does not cut the cell. Instead, it divides the current collector. A metal mesh (silver mesh in the example in the figure) is used as the cathode current collector 4. By dividing the metal mesh into multiple parts, the current distribution of the single cell is studied. Insulating mica paper 3 is used to insulate the cathode-side fixture 10 and the cathode current collector 4. The cathode current collection is connected to the silver mesh using a silver wire and led out of the cell. On the anode side, there are an anode voltage line 19 and an anode current line 20, and all leads are connected to the test device.

[0045] The current test device uses an electronic load (or an electrochemical workstation) to control the discharge of the cell. The current leads of each area pass through a Hall current sensor 30. The current of each area is measured non-contactly through the Hall current sensor 30. A data acquisition instrument is used to collect the voltage signals output by the Hall current sensor 30 and convert them into actual current values of each area through a conversion coefficient. Finally, all data is collected into a computer.

[0046] This method and test device can accurately measure the current values of each area and obtain the specific current distribution of the single cell. This method does not require separate processing or improvement of the cell sheet, flow field plate, and fixture, has little impact on the cell performance, ensures that each partition is in an equipotential working state during the measurement process, which is consistent with the actual service state of the cell. Only one electronic load (or an electrochemical workstation) is needed to control the simultaneous operation of each partition, and the operation is convenient and simple; the obtained current distribution has high accuracy, high reliability, fast response speed, simple operation, and can monitor the current distribution of the cell online, which is of great significance for in-depth study of the current distribution characteristics of a single cell and rapid evaluation of the consistency of the current distribution of battery products.

[0047] Currently, the current test methods for fuel cells include: printed circuit board method, sub-cell method based on sub-cell structure, method of inversely inferring current density based on cell potential distribution measurement, method using multiple electronic loads or multi-channel potentiostats, and parallel resistance method, etc. However, the sub-cell method changes the traditional fuel cell structure and requires special preparation, increasing the cost. At the same time, the differences that occur during the preparation of each sub-cell will have a great impact on the test, resulting in increased errors. The printed circuit board method requires embedding the PCB board into the cell flow field plate, changing the cell structure, and it is also difficult to apply in a high-temperature environment.

[0048] Based on the deficiencies of the above methods, the present invention proposes a test method and device for the current distribution of high-temperature solid oxide fuel cells. The present invention combines the battery partition test method with the measurement of the Hall current sensor 30 to achieve high-precision and high-sensitivity online measurement. The two key problems solved by this method are: 1. How to divide the battery area; 2. How to measure the current in each area.

[0049] Regarding the division of the battery area, the number of areas should be neither too many nor too few. Practice has found that the rectangular division method is more appropriate, which can completely cover most of the reaction area on the cathode side of the battery. Research has found that dividing the battery into ten areas can already fully characterize the characteristics of the current distribution of the battery, such as Figure 2 shown. The battery used in the experiment has an anode area of 10 cm × 10 cm and a cathode reaction area of 9 cm × 9 cm. The size of each silver mesh cut is 8.4 cm × 1.7 cm, and the length in contact with the cathode reaction area is 4.4 cm. The 4 cm silver mesh led out of the battery is used to connect to the silver wire and led out of the high-temperature furnace. There is a 1.2 mm gap between each silver mesh to prevent short circuit caused by contact between each silver mesh. High-temperature glue is used to fix the edge of the silver mesh on the edge of the battery. In addition, the cathode of the battery and the cathode-side fixture need to be insulated to avoid short circuit in the entire area caused by the contact between the current-collecting silver mesh 8 and the cathode-side fixture. Research has found that using mica paper can achieve a good insulation effect.

[0050] As Figure 2 shown, the single-cell partition method is to partition the current-collecting silver mesh on the cathode side. The battery specifications used are an anode effective area of 10 cm × 10 cm and a cathode effective area of 9 cm × 9 cm. The cathode current-collecting silver mesh 4 is divided into ten areas, each area being 1.7 cm × 4.4 cm, and there is a 1.2 mm gap between each area to avoid internal short circuit of the battery caused by contact between the current-collecting silver meshes.

[0051] As Figure 3 shown, in order to ensure that all the discharge current of the single cell 15 is collected by the current-collecting silver mesh 4 on the cathode side, a piece of mica paper 3 is added between the cathode side 5 of the single cell and the cathode side 1 of the fixture. The mica paper 3 is completely attached to the flow field plate of the cathode side 1 of the fixture, which not only realizes insulation but also avoids affecting the gas flow in the flow field plate.

[0052] For the measurement of the current in each area, since the battery needs to work in a high-temperature furnace and the ambient temperature is high, the commonly used printed circuit board method cannot work at high temperatures. At the same time, there are many battery partitions, and more electronic loads and DC power supplies are required to measure each area separately, resulting in high experimental costs. Therefore, in this method, silver wires are connected to the battery current-collecting silver mesh 8 and led out of the high-temperature furnace, and then connected to the leads passing through the Hall current sensor 30. The current in each area is measured non-contact through the Hall current sensor 30. This method avoids the influence of the high-temperature working environment on the measurement and the cost problem of using multiple electronic loads and DC power supplies, reduces the operation difficulty, and improves the measurement accuracy.

[0053] The present invention also proposes a test device, which can further study the distribution characteristics of the battery on the basis of facilitating the use of the test method. The test device includes: a Hall current sensor 30, a DC power supply for the Hall current sensor 30, a PCB circuit board 29, and a device housing.

[0054] The Hall current sensor 30 is mounted on the PCB circuit board 29 through a base. The DC power supply for the Hall current sensor 30 is connected to the PCB circuit board 29 through a copper column 38 to provide a working voltage for the Hall current sensor 30. The Hall current sensor 30, the DC power supply for the Hall current sensor 30, and the PCB circuit board 29 are all placed inside the device housing.

[0055] The PCB circuit board 29 is equipped with positive and negative power supply wires. Copper wires are provided at the signal output points of the Hall current sensor 30 on the base of the PCB circuit board 29 to collect them on the lower side of the PCB circuit board 29 for connection to the data acquisition instrument.

[0056] The front of the device housing is provided with wiring holes for connecting the battery leads, and the back is provided with corresponding wiring holes for connecting the wires passing through the Hall current sensor 30. Near the back wiring holes, there is a back current-collecting hole 27 for fixing the current collector on the device housing.

[0057] The front of the device housing is also provided with an anode voltage wiring hole and an anode current wiring hole. Corresponding to the back of the device housing, there are also an anode voltage wire 19 wiring hole and an anode current wire 20 wiring hole. The back current-collecting hole 27 is provided with a summary current-collecting hole, and the current collector is also provided with a summary current-collecting hole, which is connected to the back current-collecting hole 27 through a terminal as the cathode current and voltage terminals.

[0058] As Figure 1 shown, the test system of the present invention includes a single cell 15 of a flat solid oxide fuel cell, a test device 16 including a Hall current sensor 30, a PCB circuit board 29, and a DC power supply for the Hall current sensor, an electronic load 23, a data acquisition instrument 24, and a computer terminal 25.

[0059] As Figure 4As shown in the figure, after the single cell is partitioned into 15 parts, it is placed in a fixture. The cathode 5 of the single cell is on the top, and the anode 6 is on the bottom. First, a layer of gasket 2 is laid around the cathode-side fixture 1. Then, the insulating mica paper 3 is laid on the gasket 2. After placing the insulating mica paper 3, another layer of gasket 2 is placed around it. Then, the cathode side 5 of the single cell is placed face up on the insulating mica paper 3. The current-collecting silver mesh 8 and the current-collecting nickel mesh 7 are placed on the anode side 6 of the single cell. After laying the gasket 9 around the anode-side fixture 10, it is closed with the cathode-side fixture 1. Each cathode current collector 4 has a separate lead wire led out from inside the battery and connected to the test device 16 as the current and voltage lines 18 of the single cell cathode. The current-collecting silver mesh 8 on the anode side has a separate lead wire led out of the single cell 15 and connected to the test device as the anode voltage line 19. The tube of the anode-side fixture 10 is wrapped with a lead wire, which is used as the anode current line 20 and connected to the test device 16.

[0060] As Figure 5 shown, there are battery lead wire connection holes 31 on the front of the test device 16, which are connected to the lead wire 18 of the cathode. There are connection holes corresponding to the front of the test device on the back of the test device 16. There are the same number of current-collecting holes 27 near the connection holes on the back of the test device. The current-collecting holes 27 are connected to the current-collecting plate through terminal posts and converge on the left current-collecting hole 26. There is a data transmission interface 34 on the back of the test device 16. The current-collecting holes 27 on the back of the test device are connected or disconnected from the connection holes 31 on the back of the test device through lead wires. There is a current-collecting plate 39 on the back of the test device. The terminal posts are used to pass through the current-collecting holes 27 on the back and are fixed on the wall surface of the test device 16. There are a large window 28 and a small window 36 on the left side of the test device 16, which are used to provide heat dissipation and power supply for the DC power supply 37 of the Hall current element placed inside. The wires led out from the single cell 15 are connected at the connection holes using terminal posts and the lead wires passing through the Hall current sensor 30. The PCB circuit board 29 is connected by copper posts 38. The DC power supply 37 of the Hall current sensor provides the working voltage for the Hall current sensor by being connected to the copper posts 38. There are signal output holes on the PCB circuit board 29 to collect the voltage signals recorded by the Hall current sensor and are connected to the data transmission interface 37 on the back of the device housing.

[0061] As Figure 6 shown, it is the layout diagram of the Hall current sensor inside the test device. The Hall current sensor 30 is installed on the PCB circuit board 29. There are output signal holes 42 of the Hall current sensor and holes 41 for collecting the output signals on the PCB circuit board, so as to be connected to the data output interface 34 of the test device.

[0062] Compared with the prior art, the advantages of the present invention are as follows:

[0063] 1. The current measurement of each area of the single cell is realized without affecting the battery performance, and there is no need to separately process and improve the battery, flow field plate and fixture; As Figure 2As shown, the use of the rectangular division method enables the current-collecting silver mesh 8 to cover most of the cathode reaction area, avoiding the need to separately design or improve the battery or test results and their impact on battery performance and measurement results in other methods (such as the sub-battery method, flow field plate division method, etc.). There are intervals left between the various parts of the current-collecting silver mesh 8 to avoid short circuits, and each area is numbered for easy distinction.

[0064] 2. Non-contact measurement can be carried out at high temperatures; the present invention applies the Hall current sensor 30 to the test of high-temperature solid oxide fuel cells, realizing non-contact measurement of the current distribution of high-temperature solid oxide fuel cells, which not only reduces the experimental cost, improves the accuracy of current measurement, but also ensures that each partition is always in an equipotential working state, consistent with the actual service state of the battery.

[0065] 3. By connecting and disconnecting the current-collecting holes and wiring holes, the discharge test of a single area can be realized; the current test methods are difficult to separately control each area for discharge testing, and the focus of research is on the overall current distribution of the battery. For this, the test device of the present invention is provided with current-collecting holes and wiring holes. The current-collecting holes are connected to the current collector plate 39, and the currents of each area can be aggregated to an output terminal for output. The wiring holes are near the current-collecting holes. The wiring holes are connected to the leads passing through the Hall current sensor 30 through the wiring terminals. The wiring holes are not in contact with the current collector. By controlling the connection or disconnection of the leads of a single area to the current collector through the wiring plug, the discharge test of a single area is realized. In addition, by disconnecting a certain area of the battery, the change in the overall performance of the battery when a certain part of the battery fails during actual operation can be simulated.

[0066] 4. The voltage of each area can be separately measured by an external wiring method. The present invention connects the data acquisition leads to the cathode leads and anode voltage leads of each area of the battery through plug-and-play wiring terminals and connects to the data acquisition, enabling online recording of the voltage changes of each area, which is of great significance for in-depth study of the performance and attenuation of each area of the battery.

[0067] 5. The present invention can be used to study the attenuation of single cells. The present invention can record the changes in current and voltage in each area when the fuel distribution is uneven, and separately measure the EIS of each area to study the attenuation of each part of the battery under long-term operation, and can also simulate the influence of uneven fuel distribution on the attenuation rate of each part of the battery.

[0068] During specific use, power is supplied to the SOFC performance test system and the current test device. The packaged SOFC battery 15 is placed into the furnace chamber 17 of the high-temperature furnace. The heating rate of the high-temperature furnace 17 is set at 2 °C / min. When the temperature rises to 600 °C, it is held for 2 h to remove the organic matter in the gasket 2. Then, it is heated to 850 °C at a rate of 2 °C / min and held for 1 h to soften the gasket 2. Finally, it is cooled to the operating temperature of 750 °C at a rate of 2 °C / min. At the operating temperature, the flow rate of the safety gas nitrogen is set on the flowmeter control software interface to detect leaks and purge the SOFC anode. The gas switches for the air 21 on the cathode side and the hydrogen 22 on the anode side are opened, and gases with corresponding flow rates are introduced to start reduction. After the reduction is completed, different gas flow rates are set to test the performance of the battery, and the experimental data are recorded and the I-V performance curve of the SOFC is plotted. The test device 16 and the data acquisition instrument 24 are connected. Different battery operating conditions are set in sequence according to the previous experimental plan, and the output signal of the data acquisition instrument is recorded. After the experiment is completed, the hydrogen and air are turned off, the operation program of the high-temperature furnace 17 is ended, and it is allowed to cool naturally to room temperature, and the power supplies of all experimental test instruments are turned off. After the experiment, the experimental data recorded by the electronic load 23 and the data acquisition instrument 24 are exported, and the I-V curve graph and current distribution graph under the corresponding operating conditions are plotted using the origin drawing software, and the experimental data are processed and analyzed.

[0069] Compared with the prior art, the beneficial effects of the present invention are as follows: By combining the innovative battery partition test method with the Hall current sensor measurement, non-destructive, easy-to-implement, and adjustable partition characterization of the battery is achieved. At the same time, the partition current measurement has high accuracy, fast response, and simple control. During the measurement process, each partition always operates at an equal electric potential, and the current distribution law under the actual service state of the battery can be obtained. In addition, this technology does not require separate design of the battery, flow field plate, and test fixture. The equipment is simple, the operation is convenient, and the experimental cost is low. It has important significance for in-depth research and testing of the current distribution characteristics of flat-plate solid oxide fuel cells, and has good application prospects in scientific research and industrial applications.

[0070] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.

[0071] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A method for testing the current distribution of a flat-plate solid oxide fuel cell, characterized in that, Including: S1. Non-destructive partitioning of the battery: The battery partitioning is achieved by dividing the electrode current collector network. For anode-supported and electrolyte-supported batteries, a layer of current collector metal mesh is added between the cathode and the cathode fixture. For cathode-supported batteries, a layer of current collector metal mesh is added between the anode and the anode fixture. The current collector metal mesh can be a silver mesh, a gold mesh, a platinum mesh, or a nickel mesh. The current collector metal mesh is in close contact with the electrode. The current collector metal mesh is divided into multiple regions, and each region is led out by a separate wire to achieve battery partitioning; S2. Lateral current control between partitions: A certain gap is maintained between the current collector metal meshes to reduce the lateral current between the partitions. The electrode material at the gap can be removed to further reduce the lateral current. The high-temperature furnace is programmed to heat up, softening the gasket and removing organic substances; S3. Insulation between partitions and fixtures: Insulate the divided current collector metal mesh and its wires from the fixture; S4. Partition current acquisition and working control: The partition current acquisition is carried out by non-contact measurement through a Hall sensor array and transmitted to the computer through data acquisition. The partition current leads are collected on the PCB circuit board assembly after passing through the Hall sensor array and are connected to an electronic load or an electrochemical workstation together. The working state of the battery is controlled by a single electronic load or an electrochemical workstation within the modular housing mechanism, which can ensure that each partition of the battery is in an equipotential working state and is also convenient to implement; S5. Data post-processing: Export the data to plot the I-V curve and the current distribution map, and perform data processing and analysis on the experiment.

2. The method for testing the current distribution of a flat-plate solid oxide fuel cell according to claim 1, wherein The multiple regions in S1 are more than two regions.

3. The method for testing the current distribution of a flat-plate solid oxide fuel cell according to claim 1, wherein The gap between each partition in S2 is 0.2 mm or more. In S2, insulation mica paper is used to insulate the electrode fixture and the current collector.

4. The method for testing the current distribution of a flat-plate solid oxide fuel cell according to claim 1, characterized in that, The contact measurement in S4 is to measure the current of each partition using a Hall current sensor.

5. The method for testing the current distribution of a flat-plate solid oxide fuel cell according to claim 1, wherein The on-off of the current in a single region in S4 is controlled by connecting a pluggable terminal.

6. Device for testing current distribution of flat solid oxide fuel cell, characterized in that, Including: Modular housing mechanism: It includes a device housing and a wiring assembly, and the wiring assembly is installed on the device housing; Hall sensor array: It includes a Hall current sensor and a DC power supply for the Hall current sensor, and the DC power supply for the Hall current sensor is connected to the Hall current sensor; PCB circuit board assembly: It includes a power supply wire assembly and a data connection assembly, and the data connection assembly is connected to the Hall current sensor; The Hall current sensor, the DC power supply for the Hall current sensor, and the PCB circuit board are all installed inside the device housing.

7. The device for testing the current distribution of a flat-plate solid oxide fuel cell according to claim 6, characterized in that, Voltage wiring holes and current wiring holes are provided on both the front and back of the device housing.

8. The device for testing the current distribution of a flat-plate solid oxide fuel cell according to claim 6, characterized in that, The DC power supply for the Hall current sensor supplies power to the PCB circuit board through a copper post, and the Hall current sensor is installed on the PCB circuit board through a base.

9. The device for testing the current distribution of a flat-plate solid oxide fuel cell according to claim 7, characterized in that, A back current collector hole is provided on the device housing, and a summary current collector hole is provided on the back current collector hole.

10. The device for testing the current distribution of a flat solid oxide fuel cell according to claim 9, wherein A terminal is connected to the summary current collector hole, and both ends of the terminal are connected to the summary current collector hole and the back current collector hole respectively.

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