SOFC electric pile detection device and control system thereof

Abstract

The utility model discloses an SOFC (Solid Oxide Fuel Cell) stack detection device and a control system thereof, and belongs to the technical field of high-temperature fuel cell stack detection. The SOFC electric pile detection device is used for being connected with an electric pile to carry out voltage inspection and comprises a switching assembly, and the switching assembly and the electric pile are located in a hearth together. The switching assembly is provided with a plurality of wiring positions at intervals, and the wiring positions are correspondingly connected with a first voltage line and a second voltage line. Each first voltage line is connected with one single battery, and the second voltage line penetrates through the hearth wall and is used for being connected with an inspection unit outside the hearth; and the switching assembly enables the interval between the adjacent first voltage lines to be gradually increased from the electric pile to the switching assembly. Through the arrangement of the switching assembly, the spacing distance between the voltage lines is increased, and the risk of short circuit of the voltage lines is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of high-temperature fuel cell stack detection, and more specifically, to a SOFC stack detection device and its control system. Background Art

[0002] A solid oxide fuel cell (SOFC) is a high-temperature fuel cell that uses a solid oxide as an electrolyte and can directly convert chemical energy into electrical energy. SOFC batteries have the advantages of high efficiency, low emissions, and fuel flexibility, and have broad application prospects in the energy field. The working principle of the SOFC battery is that oxygen reduction reaction and hydrogen oxidation reaction occur on both sides of the anode and cathode respectively, and current collection is carried out on the stack or battery through the end plates or current lead rods at both ends of the stack. The existing test system can realize the real-time detection of the voltage at both ends of the SOFC stack or the voltage of some single cells, but it cannot reach the level of inspecting each single cell of the entire stack. This is mainly because the SOC stack needs to be in a high-temperature state (600 - 800 °C) and the distance between single cells is very small (6 - 10 mm). When inspecting the stack voltage, each single cell needs to be connected with a voltage wire, and it is difficult to handle the insulation problem between voltage wires.

[0003] Patent CN217788464U discloses a voltage acquisition system for a fuel cell stack inspection circuit, including a fuel cell, a collection terminal, and a wire; the fuel cell includes a plurality of bipolar plates stacked, the bipolar plate includes a cathode plate and an anode plate, the collection terminal is connected to the bipolar plate; one end of the wire is electrically connected to the collection terminal, and the wire is used to transmit the voltage signal between the bipolar plates. This solution can solve the problem that the plug-in parts in the existing voltage acquisition system for the inspection circuit of a proton exchange membrane fuel cell (PEMFC) stack are not easy to disassemble and assemble, resulting in inconvenient maintenance of the fuel cell. However, since the operating temperature of the PEMFC stack is less than 100 °C, this device does not involve the problem that the inspection device is prone to short circuit during high-temperature operation, and cannot be applied to high-temperature oxide fuel cells.

[0004] In addition, considering that impedance testing of the stack requires shielding the influence of other instruments, it is necessary to realize the connection switching between the voltage wire, the inspection instrument, and the electrochemical workstation.

[0005] In summary, the existing fuel cell inspection devices have the following deficiencies: 1) They are not suitable for use with high-temperature SOFC stacks; 2) They cannot realize the one-by-one inspection of single cells in the SOFC stack; 3) They cannot realize the connection switching between the voltage wire and different test units. Summary of the Utility Model

[0006] The utility model provides a SOFC stack detection device, which solves the problems that the existing stack detection device cannot perform voltage inspection on single cells in the stack one by one under high-temperature working environments and is prone to voltage line short circuits.

[0007] The utility model also provides a control system for a SOFC stack detection device, which solves the problems that the control system of the existing stack detection device cannot perform one-by-one inspection on single cells in the stack and can only perform voltage detection.

[0008] To achieve the above object, the technical solution provided by the utility model is as follows:

[0009] A SOFC stack detection device is used to be connected to a stack for voltage inspection.

[0010] It includes an adapter component, and the adapter component and the stack are located in a furnace chamber together.

[0011] A plurality of wiring positions are arranged at intervals on the adapter component, and the wiring positions are correspondingly connected to a first voltage line and a second voltage line.

[0012] Each first voltage line is connected to a single cell, and the second voltage line passes through the furnace chamber wall for connection to an inspection unit outside the furnace chamber; the adapter component makes the interval between adjacent first voltage lines gradually increase from the stack to the adapter component.

[0013] As a further improvement, the adapter component includes an insulating rod, and the wiring positions are arranged in a row on the insulating rod.

[0014] As a further improvement, the wiring position is a wiring post passing through the insulating rod, one end of the wiring post is connected to the first voltage line, and the other end is connected to the second voltage line.

[0015] As a further improvement, the wiring position is a connecting wire passing through the insulating rod, one end of the connecting wire is connected to the first voltage line, and the other end is connected to the second voltage line.

[0016] As a further improvement, the setting direction of the insulating rod is consistent with the stacking direction of single cells in the stack.

[0017] As a further improvement, locking pieces are respectively connected to both ends of each wiring post for fixing the wiring post on the insulating rod.

[0018] As a further improvement, insulating layers are sleeved on the voltage lines located in the furnace chamber.

[0019] As a further improvement, the insulating layer is a ceramic bead or a ceramic tube.

[0020] The utility model also provides a control system for a SOFC stack detection device.

[0021] Including the SOFC stack detection device, during inspection, the second voltage line passes through the furnace wall and is connected to the inspection unit outside the furnace through the switch unit;

[0022] Also included is an impedance testing unit and a control unit;

[0023] The switch unit is provided with a first connection end connected to the inspection unit and a second connection end connected to the impedance testing unit;

[0024] The control unit is connected to the switch unit, and is used to control the first connection end or the second connection end of the switch unit to be connected to the second voltage line.

[0025] As a further improvement, one end of the second voltage line located outside the furnace is connected to a wiring terminal, and the wiring terminal is connected to the switch unit through a wire.

[0026] Compared with the prior art, the technical solution provided by the utility model has the following beneficial effects:

[0027] (1) The utility model provides a SOFC stack detection device, which is provided with a switching assembly. The voltage line in the furnace is first connected to the switching assembly and then connected to other components through the switching assembly. The spacing between adjacent first voltage lines is gradually increased from the stack to the switching assembly through the switching assembly, thereby increasing the spacing between the voltage lines, reducing the risk of short circuit of the voltage line in a high temperature environment, and improving the safety of voltage inspection.

[0028] (2) The utility model provides a SOFC stack detection device, wherein each first voltage line is connected to a single cell, the first voltage line is connected to the second voltage line, the second voltage line passes through the furnace wall and is used to connect to the inspection unit outside the furnace, and the single cells in the stack are inspected one by one through the inspection unit.

[0029] (3) The utility model provides a control system for a SOFC stack detection device. A first connection terminal and a second connection terminal are provided on a switch unit. The control unit controls the switch unit to operate. During inspection, the stack is connected to the inspection unit; during impedance testing, the stack is connected to the impedance testing unit. No rewiring is required, and switching between voltage inspection and impedance testing can be realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a schematic diagram of the detection device;

[0031] Figure 2 It is a schematic diagram of the structure of the transfer component;

[0032] Figure 3 This is a schematic diagram of the control system principle of the detection device.

[0033] Description of labels:

[0034] 1. Furnace wall; 2. Furnace stack; 3. Adapter assembly; 301. Insulating rod; 302. Locking piece; 303. Terminal block; 4. Insulating layer; 5. Terminal block; 6. Switch unit; 601. First connection end; 602. Second connection end; 7. Control unit; 8. Inspection unit; 9. Impedance test unit. DETAILED DESCRIPTION

[0035] In order to further understand the content of the utility model, the utility model is described in detail in conjunction with the drawings and embodiments.

[0036] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the utility model, so they have no substantial technical significance. Any structural modification, change in proportional relationship or adjustment of size, without affecting the effects and purposes that can be achieved by the utility model, should still fall within the scope of the technical content disclosed by the utility model. At the same time, the terms such as "upper", "lower", etc. quoted in this specification are only for the convenience of description, and are not used to limit the scope of implementation. The change or adjustment of their relative relationship should also be regarded as the scope of implementation of the utility model without substantial change in the technical content.

[0037] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so as to describe the embodiments of the present application described herein.

[0038] Combination Figure 1 and Figure 2 As shown, a SOFC stack detection device provided in this embodiment is connected to the stack 2 during voltage inspection. The stack 2 includes a plurality of cells stacked together, with a spacing of 6-10 mm between adjacent cells. The voltage of each cell in the SOFC stack is collected by the device during inspection.

[0039] Specifically, the battery stack detection device includes an adapter assembly 3, which is located in the furnace together with the battery stack 2. A plurality of wiring positions are arranged at intervals on the adapter assembly 3, and the wiring positions are correspondingly connected to the first voltage line and the second voltage line. Each first voltage line is connected to a single battery, and the second voltage line passes through the furnace wall 1 to be connected to the inspection unit 8 outside the furnace; the adapter assembly 3 gradually increases the interval between adjacent first voltage lines from the battery stack 2 to the adapter assembly 3.

[0040] Specifically, the adapter assembly 3 includes but is not limited to an insulating rod 301, and the wiring positions are arranged on the insulating rod 301. When the wiring positions are arranged on the insulating rod 301, they are arranged in intervals from top to bottom. As a preferred mode, the wiring positions are arranged in rows from top to bottom on the insulating rod 301.

[0041] In this embodiment, the connection position is a terminal post 303 provided through the insulating rod 301, one end of the terminal post 303 is connected to the first voltage line, and the other end is connected to the second voltage line. The interval between adjacent terminals 303 is greater than the interval between adjacent cells in the stack 2, so that the interval between adjacent first voltage lines gradually increases from the stack 2 to the adapter assembly 3. One end of each terminal post 303 is connected to a cell in the stack 2 through the first voltage line, and the other end is connected to the second voltage line.

[0042] In another embodiment, the connection position is a connecting wire that passes through the insulating rod 301, one end of the connecting wire is connected to the first voltage line, and the other end is connected to the second voltage line. The connecting wire can be set separately, and the two ends are respectively connected to the first voltage line and the second voltage line. In some cases, the connecting wire can also be a part of the first voltage line or a part of the second voltage line. In this case, there is no need to set up a connecting wire separately, which reduces the wiring process.

[0043] The SOFC stack in this embodiment is a high-temperature fuel cell, which operates in a high-temperature environment of 600-800°C. When the stack voltage inspection is performed, the stack is located in the furnace, and the temperature in the furnace also reaches 600-800°C. The temperature in the furnace is high, and the spacing between the single cells in the stack 2 is small. If the voltage line is connected to the single cell, the voltage line is directly connected to the inspection unit, and the voltage line needs to be led from the furnace to the outside of the furnace. The wiring is difficult to arrange, and short circuit problems are prone to occur between the voltage lines.

[0044] In this embodiment, an adapter assembly 3 is provided, and a wiring position is provided in the adapter assembly 3, and the first voltage line and the second voltage line are connected correspondingly through the wiring position. The first voltage line is connected to each single battery one by one, and the spacing between adjacent wiring positions is larger than the spacing between adjacent single batteries, so that the spacing between adjacent first voltage lines gradually increases from the battery stack 2 to the adapter assembly 3, increasing the spacing between adjacent first voltage lines and adjacent second voltage lines, improving the insulation safety between the voltage lines, and reducing the risk of short circuit of the voltage lines in a high temperature environment.

[0045] One end of the second voltage line is connected to the first voltage line through the connection position, and the other end passes through the furnace wall 1 to the outside of the furnace, and during the inspection, it is connected to the inspection unit 8, and the voltage inspection of each single cell in the battery stack 2 is performed one by one through the inspection unit 8. In addition, the second voltage line is led out of the furnace, and the voltage line is connected to the inspection unit 8 outside the furnace, which is more convenient for operation.

[0046] Specifically, as Figure 2 shown, the insulating rod 301 is a ceramic wiring rod, specifically an alumina ceramic rod. Most preferably, the setting direction of the insulating rod 301 is the same as the stacking direction of the single cells in the fuel cell stack 2, which facilitates the corresponding connection between the wiring positions on the insulating rod 301 and the single cells. In other cases, the setting direction of the insulating rod 301 can also be set at a certain angle according to the space in the furnace.

[0047] Specifically, in this embodiment, a plurality of through holes are formed at intervals on the insulating rod 301. The plurality of through holes are arranged in a row, and the terminal posts 303 are connected in the through holes. Both ends of the terminal posts 303 extend to the outside of the insulating rod 301. Locking members 302 are respectively connected to both ends of each terminal post 303 for fixing the terminal posts 303 on the insulating rod 301. Flat steps are provided at both ends of the terminal posts 303, and connection holes are left on the steps for facilitating the connection of voltage wires.

[0048] Insulating layers 4 capable of withstanding high temperatures of 600 - 800 °C are sleeved and connected on the first voltage wire and / or the second voltage wire located in the furnace, further reducing the risk of short - circuit of the voltage wire. The voltage wire in this embodiment is made of Fe - Cr - Al alloy wire, and the insulating layer 4 is made of ceramic beads. In other cases, the insulating layer 4 can also be made of ceramic tubes or other replaceable components.

[0049] As Figure 3 shown, in another embodiment, a control system for the SOFC fuel cell stack detection device is also provided. The control system includes the SOFC fuel cell stack detection device described above. During the inspection, the second voltage wire passes through the furnace wall 1 and is connected to the inspection unit 8 outside the furnace through the switch unit 6.

[0050] The control system further includes an impedance test unit 9 and a control unit 7. A first connection end 601 connected to the inspection unit 8 and a second connection end 602 connected to the impedance test unit 9 are provided on the switch unit 6; the control unit 7 is connected to the switch unit 6 for controlling the connection between the first connection end 601 or the second connection end 602 of the switch unit 6 and the second voltage wire.

[0051] Through this control system, each second voltage wire is connected to the switch unit 6. In the switch unit 6, each second voltage wire corresponds to two connection ends, namely the first connection end 601 and the second connection end 602. Further, in order to facilitate the connection between the switch unit 6 and the second voltage wire, one end of the second voltage wire located outside the furnace is connected to a terminal 5, and the terminal 5 is connected to the switch unit 6 through a wire. Each single cell in the fuel cell stack 2 is connected to the first voltage wire one by one, the first voltage wire is connected to the second voltage wire, and the second voltage wire is connected to the switch unit 6 through the terminal 5 and the wire.

[0052] When performing voltage inspection, the control unit 7 controls the switch unit 6 to connect the second voltage line to the first connection end 601, so that the second voltage line is connected to the inspection unit 8, and the inspection unit 8 is used to inspect the voltage of each single cell in the stack 2 one by one. When performing impedance test, the control unit 7 controls the switch unit 6 to connect the second voltage line to the second connection end 602, so that the second voltage line is connected to the impedance test unit 9, and the impedance test unit 9 is used to perform impedance test on each single cell in the stack 2. By controlling the action of the switch unit 6 by the control unit 7, the switching between voltage inspection and impedance test of the stack 2 is realized.

[0053] During impedance test, it is necessary to shield the influence of other devices on the test. Through this control system, the impedance test of the stack 2 is still carried out independently, without the need for re-wiring and will not be affected by voltage inspection.

[0054] In this embodiment, the switch unit 6 is a relay, the inspection unit 8 is an inspection instrument, and the impedance test unit 9 is an electrochemical workstation. A PLC control program is set in the control unit 7, and the action of the switch unit 6 is controlled by the PLC to complete the switching of the connection between the voltage line and the inspection instrument and the electrochemical workstation. The normal initial state is that the relay is connected to the inspection instrument. When the stack needs to perform impedance test, the relay is controlled by the PLC to be switched to connect to the electrochemical workstation, and then the impedance test of the single cell of the stack can be carried out.

[0055] The terms "installation", "setting", "provided with", and "connection" referred to herein should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or there can be internal communication between two devices, components or parts. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific situations.

[0056] The above schematically describes the present invention and its implementation manners. This description is not restrictive. What is shown in the drawings is only one of the implementation manners of the present invention, and the actual structure is not limited thereto. Therefore, if those of ordinary skill in the art are inspired by it and design similar structural manners and embodiments to this technical solution without creative efforts without departing from the creative purpose of the present invention, they shall fall within the protection scope of the present invention.

Claims

1. A SOFC stack detection device for connecting with a stack (2) to perform voltage inspection It is characterized in that: including an adapter assembly (3), and the adapter assembly (3) and the stack (2) are located in a furnace chamber together; a plurality of wiring positions are arranged at intervals on the adapter assembly (3), and the wiring positions are correspondingly connected to a first voltage line and a second voltage line; each of the first voltage lines is connected to a single cell, and the second voltage line passes through the furnace wall (1) for connecting with an inspection unit (8) outside the furnace chamber; the adapter assembly (3) makes the interval between adjacent first voltage lines gradually increase from the stack (2) to the adapter assembly (3).

2. The SOFC stack detection device according to claim 1, wherein: The adapter assembly (3) includes an insulating rod (301), and the wiring positions are arranged on the insulating rod (301).

3. The SOFC stack detection device according to claim 2, wherein: The wiring position is a terminal (303) passing through the insulating rod (301), one end of the terminal (303) is connected to the first voltage line, and the other end is connected to the second voltage line.

4. The SOFC stack detection device according to claim 2, characterized in that: The wiring position is a connecting wire passing through the insulating rod (301), one end of the connecting wire is connected to the first voltage line, and the other end is connected to the second voltage line.

5. The SOFC stack detection device according to claim 3 or 4, characterized in that: The setting direction of the insulating rod (301) is consistent with the stacking direction of the single cells in the stack (2).

6. The SOFC stack detection device according to claim 3, characterized in that: Locking members (302) are respectively connected to both ends of each of the terminals (303) for fixing the terminals (303) on the insulating rod (301).

7. The SOFC stack detection device according to claim 1, wherein: An insulating layer (4) is sleeved on the voltage line located in the furnace chamber.

8. The SOFC stack detection device according to claim 7, wherein: The insulating layer (4) is a ceramic bead or a ceramic tube.

9. A control system of a SOFC stack detection device, characterized in that: including the SOFC stack detection device according to any one of claims 1-8, during inspection, the second voltage line passes through the furnace wall (1) and is connected to an inspection unit (8) outside the furnace chamber through a switch unit (6); further including an impedance test unit (9) and a control unit (7); a first connection end (601) connected to the inspection unit (8) and a second connection end (602) connected to the impedance test unit (9) are arranged on the switch unit (6); the control unit (7) is connected to the switch unit (6) for controlling the first connection end (601) or the second connection end (602) of the switch unit (6) to be connected to the second voltage line.

10. The control system of the SOFC stack detection device according to claim 9, characterized in that: One end of the second voltage line located outside the furnace chamber is connected to a terminal (5), and the terminal (5) is connected to the switch unit (6) through a wire.

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