Air tightness leak detection device and leak detection system for cell stack

Abstract

The utility model relates to the field of fuel cell stack testing, in particular to an air tightness leak detection device and leak detection system for a cell stack, which comprises an upper detection plate and a lower detection plate which are vertically arranged at an interval, and the space between the upper detection plate and the lower detection plate is used for accommodating the cell stack; the upper detection plate is provided with an air inlet channel, the lower detection plate is provided with an air outlet channel, the air inlet channel and the air outlet channel are respectively connected to two ends of the cell stack, and a passage is formed among the air inlet channel, the cell stack and the air outlet channel; and the sealing gaskets are positioned between the cell stack and the upper detection plate and between the cell stack and the lower detection plate. A passage is formed among the gas inlet channel, the cell stack and the gas outlet channel, gas is input into the cell stack through the upper detection plate and is discharged from the lower detection plate, so that gas leakage and blow-by detection on the cell stack can be quickly realized, and sealing gaskets are placed among the cell stack, the upper detection plate and the lower detection plate. And the sealing gasket plays a role in sealing and buffering the cell stack and the upper and lower detection plates, so that the cell stack is prevented from being damaged.

Description

Technical Field

[0001] This utility model relates to the field of fuel cell stack testing, and in particular to a fuel cell stack airtightness leak detection device and leak detection system. Background Technology

[0002] Solid oxide fuel cell stacks are typically composed of multiple stacked battery cells, with connections, seals, and insulation between cell modules and between individual cells achieved through sealing materials. Depending on the power requirements of the stack module, high-power stacks (kilowatts or above) are often assembled from several smaller stacks. Currently, glass-ceramic sealant is the most widely used sealing material due to its excellent high-temperature sealing performance, ensuring no leakage or cross-contamination of the stack and meeting the high-temperature operating requirements of solid oxide fuel cell stacks. However, this type of sealant has high requirements for stability and thermal matching, needing to achieve sealing of the stack under high temperature and pressure. Because high-power stack modules are large and limited by the size of the sealing furnace and pressure requirements, they are usually assembled by sealing several smaller stacks before combining them. Therefore, it is necessary to perform airtightness testing on these high-temperature sealed smaller stacks to ensure the airtightness of the assembled stack.

[0003] When conducting airtightness testing on battery stacks using glass-ceramic sealant as a sealing material, extra care must be taken to protect the sealant to avoid secondary damage caused by vibration or impact. Traditional airtightness testing requires fixing plates and tubes for detecting gas inflow and outflow onto the battery stack, typically using glass sealant or welding. After testing, these components need to be removed, which is not only complex and inefficient but also prone to causing secondary damage to the battery stack. Utility Model Content

[0004] The purpose of this utility model is to address the problems of existing fuel cell stack airtightness leak detection devices in the background art, which are complex to operate, inefficient, and prone to causing secondary damage to the fuel cell stack, and to provide an airtightness leak detection device and leak detection system for fuel cell stacks.

[0005] This application discloses an airtightness leak detection device for a battery stack, including an upper detection plate and a lower detection plate arranged vertically at intervals, with the space between the upper detection plate and the lower detection plate used to accommodate the battery stack;

[0006] The upper detection plate is provided with an air inlet channel, and the lower detection plate is provided with an air outlet channel. The air inlet channel and the air outlet channel are respectively used to connect to the two ends of the battery stack, and a passage is formed between the air inlet channel, the battery stack and the air outlet channel.

[0007] It also includes a sealing gasket located between the battery stack and the upper detection plate, and between the battery stack and the lower detection plate.

[0008] The airtightness leak detection device described in this application includes an upper detection plate and a lower detection plate arranged vertically at intervals. The upper detection plate has an air inlet channel, and the lower detection plate has an air outlet channel. During testing, the battery stack is placed between the upper and lower detection plates. Since a passage is formed between the air inlet channel, the battery stack, and the air outlet channel, while the upper and lower detection plates fix the battery stack, gas can be introduced into the battery stack through the upper detection plate and discharged from the lower detection plate, so as to quickly detect leaks and cross-contamination of the battery stack. Furthermore, a sealing gasket is placed between the battery stack and the upper and lower detection plates. The sealing gasket acts as a buffer to prevent the upper and lower detection plates from directly acting on the battery stack, which could cause damage to the battery stack. At the same time, the sealing gasket also seals the upper and lower detection plates with the battery stack to prevent gas leakage. The airtightness leak detection device described in this application uses the cooperation of the upper and lower detection plates and the sealing gasket to perform airtightness testing of the battery stack. It is easy to install and disassemble, has no hard contact, and can avoid secondary damage to the battery stack, making it suitable for large-scale application of solid oxide fuel cell stacks.

[0009] Preferably, the air intake channel includes a first threaded interface and a first channel that are interconnected. The first threaded interface is located on the outside of the upper detection plate, and the first channel is located on the inside of the upper detection plate. The first channel is used to connect with the battery stack air intake port of the battery stack.

[0010] Preferably, the venting channel includes a second threaded interface, a second channel, and an opening connected in sequence. The second threaded interface is located on the outside of the lower detection plate, the second channel is located inside the lower detection plate, and the opening is opened on the inside of the lower detection plate, and the opening is used to communicate with the battery stack venting port of the battery stack.

[0011] Preferably, the inner surface of the upper detection plate is provided with a first positioning groove, the inner surface of the lower detection plate is provided with a second positioning groove, and the sealing gasket is placed in the first positioning groove and the second positioning groove.

[0012] Preferably, the sealing gasket has a through hole, and the through hole corresponds to the position of the air inlet or outlet of the battery stack.

[0013] Preferably, the device further includes a bolt assembly for connecting the upper detection plate and the lower detection plate.

[0014] The upper and lower detection plates are connected by a bolt assembly, which facilitates the application of controllable pressure to the upper and lower detection plates through the bolt assembly, thereby reducing the detection gas leakage rate and improving the accuracy of detection.

[0015] Preferably, the bolt assembly includes a plurality of fastening bolt groups arranged circumferentially around the battery stack.

[0016] Preferably, the upper detection plate is provided with a first fixing hole, which is distributed at the four corners of the upper detection plate;

[0017] The lower detection plate is provided with a second fixing hole, which is distributed at the four corners of the lower detection plate. The first fixing hole and the second fixing hole are used to install the fastening bolt group.

[0018] Preferably, at least one of the first fixing holes is provided at the middle position of each side of the upper detection plate;

[0019] At least one second fixing hole is provided at the middle position of each side of the lower detection plate.

[0020] Preferably, it also includes a ballast block, which is placed on the upper detection plate.

[0021] Preferably, the lower detection plate is also provided with loading and unloading holes.

[0022] This application also discloses a leak detection system, including the airtight leak detection device described in this application, and further including a gas supply device, wherein the gas supply device includes a cathode gas inlet pipe, a cathode gas outlet pipe, an anode gas inlet pipe and an anode gas outlet pipe;

[0023] The upper detection plate is provided with two air intake channels. The cathode air intake pipe is connected to the cathode air intake hole of the battery stack through one of the air intake channels, and a first shut-off valve is installed on the cathode air intake pipe.

[0024] The anode air inlet pipe is connected to the anode air inlet of the battery stack through an air inlet channel, and a third shut-off valve is installed on the anode air inlet pipe.

[0025] The lower detection plate is provided with two air outlet channels. The cathode air outlet pipeline is connected to the cathode air outlet of the battery stack through one of the air outlet channels. A second shut-off valve and a first pressure gauge are installed on the cathode air outlet pipeline.

[0026] The anode outlet pipeline is connected to the anode outlet of the battery stack through an outlet channel, and a fourth shut-off valve and a second pressure gauge are installed on the anode outlet pipeline.

[0027] The leak detection system described in this application includes an airtightness leak detection device and an air supply device. The air inlet pipe of the air supply device is connected to the upper detection plate of the airtightness leak detection device, and the air outlet pipe of the air supply device is connected to the lower detection plate. In use, the air outlet pipe is first closed, and gas is input into the battery stack through the air inlet pipe. Then the air inlet pipe is closed, and the pressure gauge on the air outlet pipe is observed to determine whether there is a leak. This allows the system to determine whether the cathode and anode of the battery stack are properly sealed. The system is simple to operate, convenient to use, causes minimal damage to the battery stack structure, and can quickly perform battery stack sealing tests.

[0028] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0029] 1. The airtightness leak detection device described in this application includes an upper detection plate and a lower detection plate arranged vertically at intervals. The upper detection plate is provided with an air inlet channel, and the lower detection plate is provided with an air outlet channel. During testing, the battery stack is placed between the upper detection plate and the lower detection plate. Since a passage is formed between the air inlet channel, the battery stack, and the air outlet channel, while the upper and lower detection plates fix the battery stack, gas can be introduced into the battery stack through the upper detection plate and discharged from the lower detection plate, so as to quickly realize the leakage and cross-contamination detection of the battery stack. Furthermore, a sealing gasket is placed between the battery stack and the upper and lower detection plates. The sealing gasket plays a buffering role to prevent the upper and lower detection plates from directly acting on the battery stack, which would cause damage to the battery stack. At the same time, the sealing gasket can also seal the upper and lower detection plates and the battery stack to prevent gas leakage. The airtightness leak detection device described in this application performs airtightness detection of the battery stack through the cooperation of the upper and lower detection plates and the sealing gasket. It is easy to install and disassemble, has no hard contact, avoids secondary damage to the battery stack, and is suitable for large-scale application of solid oxide fuel cell stacks.

[0030] 2. The leak detection system described in this application includes an airtightness leak detection device and an air supply device. The air inlet pipe of the air supply device is connected to the upper detection plate of the airtightness leak detection device, and the air outlet pipe of the air supply device is connected to the lower detection plate. In use, the air outlet pipe is first closed, and gas is input into the battery stack through the air inlet pipe. Then the air inlet pipe is closed, and the pressure gauge on the air outlet pipe is observed to determine whether there is a leak. This allows the system to determine whether the cathode and anode of the battery stack are properly sealed. The system is simple to operate, convenient to use, causes minimal damage to the battery stack structure, and can quickly perform battery stack sealing tests. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of this application.

[0032] Figure 2 yes Figure 1 Top view.

[0033] Figure 3yes Figure 2 Sectional view at point AA.

[0034] Figure 4 yes Figure 2 Sectional view at BB.

[0035] Figure 5 This is a schematic diagram showing the connection between the battery stack and the lower detection plate.

[0036] Figure 6 This is a schematic diagram showing the connection between the battery stack and the upper detection plate.

[0037] Figure 7 This is a schematic diagram of a sealing gasket.

[0038] Figure 8 It is a three-dimensional detection plate. Figure 1 .

[0039] Figure 9 It is a three-dimensional detection plate. Figure 2 .

[0040] Figure 10 This is a longitudinal sectional view of the upper detection plate.

[0041] Figure 11 It is a three-dimensional detection plate. Figure 1 .

[0042] Figure 12 It is a three-dimensional detection plate. Figure 2 .

[0043] Figure 13 This is a longitudinal sectional view of the lower detection plate.

[0044] Figure 14 This is a cross-sectional view of the lower detection plate.

[0045] Figure 15 This is a schematic diagram of the leak detection system of this application.

[0046] Figure 16 This is a schematic diagram of a preferred embodiment of the present application.

[0047] Marked in the image:

[0048] 1-Upper detection plate, 11-Inlet channel, 111-First threaded interface, 112-First channel, 12-First fixing hole, 13-First positioning groove, 2-Lower detection plate, 21-Outlet channel, 211-Second threaded interface, 212-Second channel, 213-Opening, 22-Second fixing hole, 23-Second positioning groove, 24-Loading and unloading hole, 3-Sealing gasket, 31-Through hole, 4-Bolt assembly, 41-Fastening bolt group, 5-Air supply device, 51-Cathode air inlet pipe, 52-Cathode air outlet pipe, 53-Anode air inlet pipe, 54-Anode air outlet pipe, 501-First shut-off valve, 502-Second shut-off valve, 503-Third shut-off valve, 504-Fourth shut-off valve, 505-First pressure gauge, 506-Second pressure gauge, 6-Battery stack, 61-Inlet hole, 62-Outlet hole, 7-Ballast block. Detailed Implementation

[0049] The present invention will be further described in detail below with reference to specific embodiments. However, it should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0050] Unless otherwise specified, the use of terms such as "upper," "lower," "left," "right," "center," "inner," and "outer" to indicate orientation or positional relationships in the description of specific embodiments of this utility model is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product / equipment / device is typically placed during use. These terms are merely for the purpose of facilitating the description of the utility model solution or simplifying the description in specific embodiments, enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on this utility model.

[0051] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," and "parallel" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, or parallel, but rather that it can be slightly tilted or have a deviation. For example, "horizontal" merely means that its direction is more horizontal relative to "vertical," not that the structure must be completely horizontal, but can be slightly tilted. Alternatively, it can be simplified to mean that the corresponding device / component / element, when set in a "horizontal," "vertical," "suspended," or "parallel" direction, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.

[0052] Furthermore, the use of terms such as "second," "third," etc. in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0053] Furthermore, in the description of the embodiments of this utility model, "several", "multiple", and "several" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.

[0054] Furthermore, in the description of the technical solution of this utility model, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "equipped with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0055] Example 1

[0056] like Figure 1-Figure 4 As shown, the airtightness leak detection device for a battery stack described in this embodiment includes an upper detection plate 1 and a lower detection plate 2 arranged vertically at intervals, with the space between the upper detection plate 1 and the lower detection plate 2 used to accommodate the battery stack 6.

[0057] The upper detection plate 1 is provided with an air inlet channel 11, and the lower detection plate 2 is provided with an air outlet channel 21. The air inlet channel 11 and the air outlet channel 21 are used to connect to the two ends of the battery stack 6 respectively, and a passage is formed between the air inlet channel 11, the battery stack 6 and the air outlet channel 21.

[0058] It also includes a sealing gasket 3, which is located between the battery stack 6 and the upper detection plate 1, and between the battery stack 6 and the lower detection plate 2.

[0059] During testing, the battery stack 6 is placed between the upper detection plate 1 and the lower detection plate 2. Since a passage is formed between the air inlet channel 11, the battery stack 6, and the air outlet channel 21, the upper and lower detection plates can fix the battery stack 6 while simultaneously allowing gas to be introduced into the battery stack 6 through the upper detection plate 1 and discharged from the lower detection plate 2, thus quickly detecting leaks and cross-contamination in the battery stack 6. Furthermore, a sealing gasket 3 is placed between the battery stack 6 and the upper and lower detection plates. The sealing gasket 3 acts as a buffer, preventing the upper and lower detection plates from directly impacting the battery stack 6 and causing damage. At the same time, the sealing gasket 3 also seals the space between the upper and lower detection plates and the battery stack 6, preventing gas leakage. The airtightness leak detection device described in this embodiment uses the cooperation of the upper and lower detection plates and the sealing gasket 3 to perform airtightness testing on the battery stack 6. It is easy to install and disassemble, has no hard contact, and avoids secondary damage to the battery stack 6, making it suitable for large-scale applications of solid oxide fuel cell stacks.

[0060] Among them, such as Figures 2-6 As shown, the air inlet channel 11 is used to connect with the air inlet 61 of the battery stack 6, and the air outlet channel 21 is used to connect with the air outlet 62 of the battery stack 6.

[0061] In one or more implementations, such as Figures 8-10 As shown, the air intake channel 11 includes a first threaded interface 111 and a first channel 112 that are interconnected. The first threaded interface 111 is located on the outside of the upper detection plate 1, and the first channel 112 is located on the inside of the upper detection plate 1. The first channel 112 is used to connect with the air intake hole of the battery stack 6.

[0062] The first threaded interface 111 is located at the beginning of the first channel 112 and is used to connect to an external gas pipeline. The first channel 112 is connected to the air inlet 61 of the battery stack 6 and is used to input gas into the air inlet 61 of the battery stack 6. The air inlet channel 11 is designed according to the position and shape of the air inlet 61 of the battery stack 6 and is used to provide a gas input channel for the battery stack 6.

[0063] In optional embodiments, such as Figures 11-14 As shown, the venting channel 21 includes a second threaded interface 211, a second channel 212 and an opening 213 connected in sequence. The second threaded interface 211 is located on the side of the lower detection plate 2, the second channel 212 is located inside the lower detection plate 2, and the opening 213 is opened on the inner side of the lower detection plate 2. The opening 213 is used to connect with the venting hole 62 of the battery stack 6.

[0064] The second threaded interface 211 is located at the end of the second channel 212 and is used to connect to an external gas pipeline. The opening 213 corresponds to the position of the vent 62 of the battery stack 6 and is used to receive the gas discharged from the vent 62. The vent channel 21 is designed according to the position and shape of the vent 62 of the battery stack 6 and is used to provide a gas output channel for the battery stack 6.

[0065] In optional embodiments, such as Figure 9 As shown, a first positioning groove 13 is provided on the inner surface of the upper detection plate 1, such as... Figure 12 As shown, the inner surface of the lower detection plate 2 is provided with a second positioning groove 23, and the sealing gasket 3 is placed in the first positioning groove 13 and the second positioning groove 23.

[0066] The dimensions of the first positioning groove 13 and the second positioning groove 23 are designed according to the structural size of the battery stack 6, and are used for the assembly and positioning of the battery stack 6.

[0067] In one or more implementations, such as Figure 11 , Figure 12 As shown, the lower detection plate 2 is also provided with loading and unloading holes 24. The battery stack 6 can be quickly loaded and unloaded through the loading and unloading holes 24;

[0068] Furthermore, there are four loading and unloading holes 24, which are arranged symmetrically in pairs on the lower detection plate 2.

[0069] In one or more implementations, such as Figure 7 As shown, the sealing gasket 3 is provided with a through hole 31, and the through hole 31 corresponds to the position of the air inlet 61 or air outlet 62 of the battery stack 6.

[0070] By providing a through hole 31 on the sealing gasket 3, it is possible for gas to pass through the sealing gasket 3 into the battery stack 6 or for gas inside the battery stack 6 to pass through the sealing gasket 3 out.

[0071] Example 2

[0072] like Figure 1-Figure 4 As shown in the figure, based on Embodiment 1, the airtightness leak detection device for a battery stack described in this embodiment further includes a bolt assembly 4, which is used to connect the upper detection plate 1 and the lower detection plate 2.

[0073] The upper detection plate 1 and the lower detection plate 2 are connected by bolt assembly 4, which facilitates the application of controllable pressure to the upper detection plate 1 and the lower detection plate 2 through bolt assembly 4, thereby reducing the detection gas leakage rate and improving the detection accuracy.

[0074] In one or more implementations, such as Figure 1 , Figure 3 , Figure 4As shown, the bolt assembly 4 includes multiple fastening bolt groups 41, which are arranged circumferentially around the battery stack 6.

[0075] By setting fastening bolt groups 41 at intervals along the circumference of the battery stack 6, interference between the battery stack 6 and the fastening bolt groups 41 is avoided, thereby facilitating the installation and removal of the fastening bolt groups 41, and thus facilitating the installation and removal of the battery stack 6.

[0076] In optional embodiments, such as Figure 8 , Figure 9 As shown, the upper detection plate 1 is provided with a first fixing hole 12, which is distributed at the four corners of the upper detection plate 1;

[0077] like Figure 11 , Figure 12 As shown, the lower detection plate 2 is provided with a second fixing hole 22, which is distributed at the four corners of the lower detection plate 2. The first fixing hole 12 and the second fixing hole 22 are used to install the fastening bolt group 41.

[0078] By setting first fixing holes 12 at the four corners of the upper detection plate 1 and second fixing holes 22 at the four corners of the lower detection plate 2, it is convenient to install the fastening bolt group 41 at the four corners of the upper detection plate 1 and the lower detection plate 2, so that the upper detection plate 1 and the lower detection plate 2 can be evenly subjected to the fastening force of the fastening bolt group 41, and the upper detection plate 1 and the lower detection plate 2 can evenly compress the sealing gasket 3, thereby ensuring the sealing performance of the detection plate 1 and the lower detection plate 2 with the battery stack 6.

[0079] In optional embodiments, such as Figure 8 As shown, at least one first fixing hole 12 is provided at the middle position of each side of the upper detection plate 1;

[0080] like Figure 11 As shown, at least one second fixing hole 22 is provided at the middle position of each side of the lower detection plate 2.

[0081] By installing fastening bolt groups 41 at the middle position of each side of the upper and lower detection plates, the fastening effect of the fastening bolt groups 41 is further increased, and the force on the upper and lower detection plates is more even.

[0082] Example 3

[0083] like Figure 16 As shown, based on Embodiment 1, the airtightness leak detection device for a battery stack described in this embodiment further includes a ballast block 7, which is placed on the upper detection plate 1.

[0084] By placing a ballast block 7 on the upper detection plate 1 to apply a certain pressure to the airtightness leak detection device, the pressure applied by the ballast block 7 can help make the contact between the upper detection plate 1 and the battery stack 6 tighter, reduce the detection gas leakage rate, improve the detection accuracy, and it is simple to operate and convenient to use.

[0085] In an optional embodiment, in actual operation, the ballast block 7 is selected as a heavy object with a certain weight, such as an iron block or a concrete block.

[0086] Example 4

[0087] like Figure 15 As shown, based on Embodiment 2 or Embodiment 3, this embodiment discloses a leak detection system, including the airtight leak detection device described in Embodiment 1, and also includes an air supply device 5, which includes a cathode air inlet pipe 51, a cathode air outlet pipe 52, an anode air inlet pipe 53 and an anode air outlet pipe 54.

[0088] The upper detection plate 1 is provided with two air inlet channels 11. The cathode air inlet pipe 51 is connected to the cathode air inlet of the battery stack 6 through one air inlet channel 11, and a first shut-off valve 501 is installed on the cathode air inlet pipe 51.

[0089] The anode air inlet pipe 53 is connected to the anode air inlet of the battery stack 6 through an air inlet channel 11, and a third shut-off valve 503 is installed on the anode air inlet pipe 53.

[0090] The lower detection plate 2 is provided with two air outlet channels 21. The cathode air outlet pipe 52 is connected to the cathode air outlet of the battery stack 6 through one air outlet channel 21. A second shut-off valve 502 and a first pressure gauge 505 are installed on the cathode air outlet pipe 52.

[0091] The anode outlet pipe 54 is connected to the anode outlet port of the battery stack 6 through an outlet channel 21, and a fourth shut-off valve 504 and a second pressure gauge 506 are installed on the anode outlet pipe 54.

[0092] The air inlet pipe of the gas supply device 5 is connected to the upper detection plate 1 of the airtightness leak detection device, and the air outlet pipe of the gas supply device is connected to the lower detection plate 2. When in use, the air outlet pipe is closed first, and gas is input into the battery stack 6 through the air inlet pipe. Then the air inlet pipe is closed, and the pressure gauge on the air outlet pipe is observed to determine whether there is a leak. This determines whether the cathode and anode of the battery stack 6 are sealed properly. The operation is simple and convenient, with minimal damage to the structure of the battery stack 6, and it can quickly perform airtightness testing on the battery stack 6.

[0093] In this embodiment, the air inlet 61 of the battery stack 6 is divided into an anode air inlet and a cathode air inlet, and the air outlet 62 of the battery stack 6 is divided into an anode air outlet and a cathode air outlet.

[0094] This embodiment also discloses a method for using a leak detection system, specifically as follows:

[0095] (1) The upper detection plate 1, the lower detection plate 2 and the sealing gasket 3 are assembled according to the corresponding positions of the air inlet and air outlet of the battery stack 6, and the upper and lower detection plates are connected by the bolt assembly 4. The upper and lower detection plates are subjected to a certain pressure by the bolt assembly 4. When using the bolt assembly 41, a torque wrench is required to tighten it in a step-by-step manner, first the four sides, then the diagonals, and clockwise.

[0096] (2) Connect and assemble the gas supply device 5 with the air tightness leak detection device to form a complete air tightness leak detection system. The upper detection plate 1 is provided with two air inlet channels 11. The cathode air inlet pipe 51 is connected to the cathode air inlet of the battery stack 6 through one air inlet channel 11, and a first shut-off valve 501 is installed on the cathode air inlet pipe 51. The anode air inlet pipe 53 is connected to the anode air inlet of the battery stack 6 through one air inlet channel 11, and a third shut-off valve 503 is installed on the anode air inlet pipe 53.

[0097] The lower detection plate 2 is provided with two air outlet channels 21. The cathode air outlet pipe 52 is connected to the cathode air outlet of the battery stack 6 through one air outlet channel 21, and a second shut-off valve 502 and a first pressure gauge 505 are installed on the cathode air outlet pipe 52. The anode air outlet pipe 54 is connected to the anode air outlet of the battery stack 6 through one air outlet channel 21, and a fourth shut-off valve 504 and a second pressure gauge 506 are installed on the anode air outlet pipe 54.

[0098] (3) When performing leak detection on the anode side of the battery stack 6, first close the fourth shut-off valve 504 on the anode outlet pipe 54, then introduce air into the battery stack 6 through the anode inlet pipe 53 so that the second pressure gauge 506 has a certain reading, then close the third shut-off valve 503 on the anode inlet pipe 53 and let it stand for a period of time. If the reading of the second pressure gauge 506 does not change, it means that the anode side air tightness of the solid oxide fuel cell stack is qualified. If the reading of the second pressure gauge 506 changes, it means that the anode side air tightness of the solid oxide fuel cell stack is unqualified.

[0099] When performing a leak test on the cathode side of the battery stack 6, first close the second shut-off valve 502 on the cathode outlet pipe 52, then introduce air into the battery stack 6 through the cathode inlet pipe 51 until the first pressure gauge 505 shows a certain reading. Then close the first shut-off valve 501 on the cathode inlet pipe 51 and let it stand for a period of time. If the reading of the first pressure gauge 505 does not change, it indicates that the cathode side airtightness of the solid oxide fuel cell stack is qualified. If the reading of the first pressure gauge 505 changes, it indicates that the cathode side airtightness of the solid oxide fuel cell stack is unqualified.

[0100] This embodiment also discloses another method for using the leak detection system, specifically as follows:

[0101] (1) The upper detection plate 1, the lower detection plate 2 and the sealing gasket 3 are assembled according to the corresponding positions of the air inlet and outlet of the battery stack 6, and a certain weight of ballast block 7 is placed on the upper detection plate 1 to apply a certain pressure to the airtightness detection device.

[0102] (2) Connect and assemble the gas supply device 5 with the air tightness leak detection device to form a complete air tightness leak detection system. The upper detection plate 1 is provided with two air inlet channels 11. The cathode air inlet pipe 51 is connected to the cathode air inlet of the battery stack 6 through one air inlet channel 11, and a first shut-off valve 501 is installed on the cathode air inlet pipe 51. The anode air inlet pipe 53 is connected to the anode air inlet of the battery stack 6 through one air inlet channel 11, and a third shut-off valve 503 is installed on the anode air inlet pipe 53.

[0103] The lower detection plate 2 is provided with two air outlet channels 21. The cathode air outlet pipe 52 is connected to the cathode air outlet of the battery stack 6 through one air outlet channel 21, and a second shut-off valve 502 and a first pressure gauge 505 are installed on the cathode air outlet pipe 52. The anode air outlet pipe 54 is connected to the anode air outlet of the battery stack 6 through one air outlet channel 21, and a fourth shut-off valve 504 and a second pressure gauge 506 are installed on the anode air outlet pipe 54.

[0104] (3) When performing leak detection on the anode side of the battery stack 6, first close the fourth shut-off valve 504 on the anode outlet pipe 54, then introduce air into the battery stack 6 through the anode inlet pipe 53 so that the second pressure gauge 506 has a certain reading, then close the third shut-off valve 503 on the anode inlet pipe 53 and let it stand for a period of time. If the reading of the second pressure gauge 506 does not change, it means that the anode side air tightness of the solid oxide fuel cell stack is qualified. If the reading of the second pressure gauge 506 changes, it means that the anode side air tightness of the solid oxide fuel cell stack is unqualified.

[0105] When performing a leak test on the cathode side of the battery stack 6, first close the second shut-off valve 502 on the cathode outlet pipe 52, then introduce air into the battery stack 6 through the cathode inlet pipe 51 until the first pressure gauge 505 shows a certain reading. Then close the first shut-off valve 501 on the cathode inlet pipe 51 and let it stand for a period of time. If the reading of the first pressure gauge 505 does not change, it indicates that the cathode side airtightness of the solid oxide fuel cell stack is qualified. If the reading of the first pressure gauge 505 changes, it indicates that the cathode side airtightness of the solid oxide fuel cell stack is unqualified.

[0106] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A leak detection device for a battery stack, characterized in that, It includes an upper detection plate (1) and a lower detection plate (2) arranged vertically at intervals, and the space between the upper detection plate (1) and the lower detection plate (2) is used to accommodate a battery stack (6); The upper detection plate (1) is provided with an air inlet channel (11), and the lower detection plate (2) is provided with an air outlet channel (21). The air inlet channel (11) and the air outlet channel (21) are used to connect to the two ends of the battery stack (6) respectively, and a passage is formed between the air inlet channel (11), the battery stack (6) and the air outlet channel (21). It also includes a sealing gasket (3) located between the battery stack (6) and the upper detection plate (1), and between the battery stack (6) and the lower detection plate (2).

2. The airtightness leak detection device for a battery stack according to claim 1, characterized in that, The air intake channel (11) includes a first threaded interface (111) and a first channel (112) that are interconnected. The first threaded interface (111) is located on the outside of the upper detection plate (1), and the first channel (112) is located on the inside of the upper detection plate (1). The first channel (112) is used to communicate with the air intake hole (61) of the battery stack (6).

3. The airtightness leak detection device for a battery stack according to claim 2, characterized in that, The venting channel (21) includes a second threaded interface (211), a second channel (212), and an opening (213) connected in sequence. The second threaded interface (211) is located on the side of the lower detection plate (2), the second channel (212) is located inside the lower detection plate (2), and the opening (213) is opened on the inner side of the lower detection plate (2) and is used to communicate with the venting hole (62) of the battery stack (6).

4. The airtightness leak detection device for a battery stack according to claim 1, characterized in that, The upper detection plate (1) has a first positioning groove (13) on its inner surface, and the lower detection plate (2) has a second positioning groove (23) on its inner surface. The sealing gasket (3) is placed in the first positioning groove (13) and the second positioning groove (23).

5. The airtightness leak detection device for a battery stack according to claim 1, characterized in that, The sealing gasket (3) is provided with a through hole (31), and the through hole (31) corresponds to the position of the air inlet (61) or air outlet (62) of the battery stack (6).

6. A leak detection device for a battery stack according to any one of claims 1-5, characterized in that, It also includes a bolt assembly (4) for connecting the upper detection plate (1) and the lower detection plate (2).

7. The airtightness leak detection device for a battery stack according to claim 6, characterized in that, The bolt assembly (4) includes a plurality of fastening bolt groups (41) arranged circumferentially around the battery stack (6).

8. The airtightness leak detection device for a battery stack according to claim 7, characterized in that, The upper detection plate (1) is provided with a first fixing hole (12), and the first fixing hole (12) is distributed at the four corners of the upper detection plate (1); The lower detection plate (2) is provided with a second fixing hole (22), which is distributed at the four corners of the lower detection plate (2). The first fixing hole (12) and the second fixing hole (22) are used to install the fastening bolt group (41).

9. A leak detection device for a battery stack according to any one of claims 1-5, characterized in that, It also includes a ballast block (7) placed on the upper detection plate (1).

10. A leak detection system, characterized in that, The device includes the airtightness leak detection device as described in any one of claims 1-9, and further includes a gas supply device (5), wherein the gas supply device (5) includes a cathode inlet pipe (51), a cathode outlet pipe (52), an anode inlet pipe (53), and an anode outlet pipe (54). The anode air inlet pipe (53) is connected to the anode air inlet of the battery stack (6) through an air inlet channel (11), and a third shut-off valve (503) is installed on the anode air inlet pipe (53); The upper detection plate (1) is provided with two air inlet channels (11), and the cathode air inlet pipe (51) is connected to the cathode air inlet of the battery stack (6) through one of the air inlet channels (11), and a first shut-off valve (501) is installed on the cathode air inlet pipe (51). The lower detection plate (2) is provided with two air outlet channels (21). The cathode air outlet pipe (52) is connected to the cathode air outlet of the battery stack (6) through one of the air outlet channels (21). A second shut-off valve (502) and a first pressure gauge (505) are installed on the cathode air outlet pipe (52). The anode outlet pipe (54) is connected to the anode outlet of the battery stack (6) through an outlet channel (21), and a fourth shut-off valve (504) and a second pressure gauge (506) are installed on the anode outlet pipe (54).

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