Accelerated aging test device for fuel cell sealing structure

Abstract

The invention relates to the technical field of battery detection, in particular to a fuel cell sealing structure accelerated aging test device which comprises an upper pressing plate and a bottom plate, the upper pressing plate and the bottom plate are rectangular plates with the same shape and size, and placing groove sets are formed in the sides, close to each other, of the bottom plate and the upper pressing plate; the multiple containing groove sets are arranged on the side edges of the bottom plate and the upper pressing plate. A first mounting cavity and a second mounting cavity are formed in the upper pressing plate and the bottom plate, the first mounting cavity and the second mounting cavity are formed below the containing groove set, the first mounting cavity is formed in the side, close to the outer edge, of the upper pressing plate and the bottom plate, and mounting grooves are formed in the edges of the upper pressing plate and the bottom plate; feeding assemblies are arranged in the first mounting cavity and the second mounting cavity and used for guiding media into the containing groove sets. According to the invention, more accurate prediction of the effective life of the fuel cell sealing material is realized by realizing a test environment which is relatively close to the real working condition of the fuel cell.

Description

Technical Field

[0001] This invention relates to the field of battery testing technology, and in particular to an accelerated aging test device for fuel cell sealing structures. Background Technology

[0002] In the fields of low-temperature and high-temperature PEM fuel cells, the durability of rubber sealing materials under actual operating conditions has a significant impact on the long-term operational stability of the entire fuel cell stack. Therefore, testing the aging characteristics of sealing materials can greatly help in predicting the service life of the fuel cell stack. Currently, the sealing materials used in fuel cells are mainly tested through accelerated aging tests.

[0003] Chinese patent CN111458225B discloses a method for predicting the lifespan of sealing materials for proton exchange membrane fuel cells. The environmental simulation method involves compressing a cylindrical sample between clamps, typically at a pressure between 0.5 MPa and 1.5 MPa, and placing it in a sealed reactor containing a simulated solution (a cooling aqueous solution collected after a period of operation of the PEM fuel cell, or a mixed solution of 1.8 × 10⁻⁶ mol / L HF and 1.2 × 10⁻⁶ mol / L H₂SO₄), followed by placement in a constant-temperature heating device. The adjustable influencing factors include temperature, assembly pressure, and solution concentration: temperature is adjusted by changing the set temperature of the constant-temperature device; pressure is adjusted by changing the clamping force.

[0004] Currently, the sealing materials used in fuel cells are mainly tested through accelerated aging tests. This involves placing test samples in a reactor to simulate a high-temperature, high-pressure environment, and adding coolant generated by the PEM fuel cell or dilute sulfuric acid to simulate the battery's coolant.

[0005] The existing test environment differs from the actual operating conditions of fuel cells. In terms of the gas atmosphere, it is difficult to achieve a pure hydrogen gas environment inside the reactor, and the internal gas pressure of the reactor is very high at high temperatures, far exceeding the actual pressure of the fuel cell. In addition, the simulated solution and gas inside the reactor cannot circulate, resulting in fluctuations in the local concentration of the medium. In contrast, in a fuel cell, the fuel gas and coolant are constantly circulating, and their composition is relatively stable. In the existing scheme, the entire material under test is in contact with the simulated solution at the same time, while in a fuel cell, the hydrogen, air, and coolant channels are independent. Different areas of the sealing material and different cavities are in contact with each other simultaneously and separately, with the contact area with the coolant being the smallest, while the contact areas with hydrogen and air are larger and similar. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of existing technologies, such as the difficulty in simulating a pure hydrogen atmosphere in the reactor, while hydrogen is inevitably present in the actual operating conditions of fuel cells. Therefore, this invention proposes an accelerated aging test device for the sealed structure of a fuel cell.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] An accelerated aging test device for a fuel cell sealing structure includes: an upper pressure plate and a bottom plate, wherein the upper pressure plate and the bottom plate are rectangular plates of the same shape and size, and a placement slot group is provided on the side of the bottom plate and the upper pressure plate that are close to each other, and a plurality of the placement slot groups are arranged on the side of the bottom plate and the upper pressure plate.

[0009] The upper pressure plate and the bottom plate are provided with a first mounting cavity and a second mounting cavity. The first mounting cavity and the second mounting cavity are located below the placement slot group. The first mounting cavity is located on the side of the upper pressure plate and the bottom plate near the outer edge, and the upper pressure plate and the bottom plate are provided with mounting slots on their edges. The first mounting cavity and the second mounting cavity are provided with feeding components, which are used to introduce the medium into the placement slot group.

[0010] The feeding assembly includes a guide block, a flow tube, an outlet tube, and a feed tube. Two feed tubes are inserted into the mounting groove. Two flow tubes are fixedly connected to the ends of the feed tubes and pass through the first mounting cavity and the second mounting cavity, respectively. The guide block communicates with the flow tubes and is located inside the first mounting cavity. The outlet tube is fixedly connected to the ends of the two flow tubes. The flow tubes are wavy and are located inside the second mounting cavity.

[0011] Preferably, the placement slot assembly includes a cylindrical slot and a dumbbell slot, which are formed on the side of the upper pressure plate and the bottom plate that are close to each other. The cylindrical slot is located in the middle of the dumbbell slot, and the dumbbell slot is close to the edge of the upper pressure plate and the bottom plate.

[0012] Preferably, the first mounting cavity is a rectangular cavity and is located below the dumbbell groove, and the second mounting cavity is cylindrical and is located below the cylindrical groove.

[0013] Preferably, a sealing strip is fixedly connected to the edges of the cylindrical groove and the dumbbell groove. The sealing strip is made of an elastic material and is used to seal the connection gap between the cylindrical groove and the dumbbell groove.

[0014] Preferably, a connecting component is provided between the upper pressure plate and the bottom plate. The connecting component is used to connect and fix the upper pressure plate and the bottom plate, so that the upper pressure plate and the bottom plate are fixedly connected. Multiple connecting components are arranged between multiple placement slots.

[0015] Preferably, the connecting assembly includes a fixing bolt and a fixing groove. The fixing groove is formed on the upper side of the base plate, and the upper pressure plate has a threaded hole corresponding to the fixing groove. The fixing bolt passes through the threaded hole and is threadedly connected to the fixing groove.

[0016] Preferably, a base is provided below the base plate, the base is located below the base plate, and a limiting ring is fixedly connected to its surface, the limiting ring being used to limit the position of the base plate.

[0017] Preferably, the base is provided with a lifting component, which is used to drive the upper pressure plate to move up and down.

[0018] Preferably, the lifting assembly includes telescopic columns, connecting frames, and connecting seats. The four telescopic columns are vertically fixedly connected to the four corners of the base. The two connecting frames are respectively fixedly connected to the upper ends of the two telescopic columns on one side. The connecting frames are triangular. The upper end of the connecting seat is fixedly connected to the bend of the connecting frame, and the bottom surface is fixedly connected to the upper pressure plate.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] 1. An independent flow channel is formed by the base plate, the upper pressure plate, and the standard rubber test strips for tension and compression. It can contact two media at the same time to simulate different temperature ranges. In addition, the medium flows during the introduction and export process, so that the test environment is closer to the real working conditions of fuel cells, thereby improving the test effect.

[0021] 2. Multiple samples can be tested in parallel under the same conditions, which improves testing efficiency and ensures testing accuracy;

[0022] 3. Independent flow channels allow for control over the type, temperature, pressure, and flow rate of the medium in contact with the sample. The design of the flow channels allows for adjustment of the shape and width of the pipe, thus improving the control range of the test conditions.

[0023] 4. This device, through a reasonable flow channel design on the pressure plate surface and combined with the shape of the test sample, can directly achieve an environment in which different areas of the test sample are in contact with different flowing media simultaneously. This is something that current testing methods cannot achieve. By realizing a testing environment that is closer to the actual working conditions of fuel cells, a more accurate prediction of the effective life of fuel cell sealing materials can be made. Attached Figure Description

[0024] Figure 1 This is a front structural schematic diagram of an accelerated aging test device for a fuel cell sealing structure proposed in this invention.

[0025] Figure 2 This is a side view of the accelerated aging test device for a fuel cell sealing structure proposed in this invention.

[0026] Figure 3 This is a schematic diagram of the feeding assembly of an accelerated aging test device for a fuel cell sealing structure proposed in this invention;

[0027] Figure 4 This is a schematic diagram of the side structure of the upper pressure plate and the bottom plate of the fuel cell sealing structure accelerated aging test device proposed in this invention;

[0028] Figure 5 This is a cross-sectional view of the base plate of an accelerated aging test device for a fuel cell sealing structure proposed in this invention.

[0029] Figure 6 This is a schematic diagram of the placement tank structure of an accelerated aging test device for a fuel cell sealing structure proposed in this invention;

[0030] Figure 7 This is a schematic diagram of the connection component structure of an accelerated aging test device for a fuel cell sealing structure proposed in this invention;

[0031] Figure 8 This is a schematic diagram of the lifting component structure of an accelerated aging test device for a fuel cell sealing structure proposed in this invention.

[0032] In the diagram: 1 Upper pressure plate, 2 Base plate, 3 Placement slot assembly, 31 Cylindrical slot, 32 Dumbbell slot, 4 First mounting cavity, 5 Second mounting cavity, 6 Feeding assembly, 61 Guide block, 62 Flow pipe, 63 Outlet pipe, 64 Feeding pipe, 7 Sealing strip, 8 Connecting assembly, 81 Fixing bolt, 82 Fixing slot, 9 Lifting assembly, 91 Telescopic column, 92 Connecting frame, 93 Connecting seat, 10 Base, 11 Limiting ring. Detailed Implementation

[0033] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0034] The terms used in this invention, such as "upper," "lower," "left," "right," "middle," and "one," are merely for clarity of description and are not intended to limit the scope of the invention. Any changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

[0035] Reference Figures 1-8 An accelerated aging test device for fuel cell sealing structure includes: an upper pressure plate 1 and a bottom plate 2. The upper pressure plate 1 and the bottom plate 2 are rectangular plates of the same shape and size. Placement slots 3 are provided on the side of the bottom plate 2 and the upper pressure plate 1 that are close to each other. Multiple placement slots 3 are arranged on the side of the bottom plate 2 and the upper pressure plate 1. There can be 6 placement slots 3, or the placement slots 3 can be designed according to the usage requirements. Multiple samples can be tested in parallel under the same conditions, which improves the testing efficiency and ensures the accuracy of the test.

[0036] The upper pressure plate 1 and the bottom plate 2 are provided with a first mounting cavity 4 and a second mounting cavity 5. The first mounting cavity 4 and the second mounting cavity 5 are located below the placement tank group 3. The first mounting cavity 4 is located on the side of the upper pressure plate 1 and the bottom plate 2 near the outer edge, and the upper pressure plate 1 and the bottom plate 2 are provided with mounting grooves on their edges. The first mounting cavity 4 and the second mounting cavity 5 are provided with a feeding assembly 6, which is used to introduce the medium into the placement tank group 3.

[0037] The feeding assembly 6 includes a guide block 61, a flow tube 62, an outlet tube 63, and a feed tube 64. Two feed tubes 64 are fitted inside the mounting groove. Two flow tubes 62 are fixedly connected to the ends of the feed tubes 64 and pass through the first mounting cavity 4 and the second mounting cavity 5, respectively. The guide block 61 is connected to the flow tubes 62 and is located inside the first mounting cavity 4. The outlet tube 63 is fixedly connected to the ends of the two flow tubes 62. The flow tubes 62 are wavy and are located inside the second mounting cavity 5. The flow tubes 62 and the guide block 61 are connected to the placement tank group 3, respectively, to conduct experimental tests on the samples inside the placement tank group 3.

[0038] In the embodiments applying the above technical solution, during the testing process, standard cylindrical samples and dumbbell-shaped specimens are placed inside two opposing placement slots 3 between the upper pressure plate 1 and the bottom plate 2. Separate medium flow channels are formed through the first mounting cavity 4 and the second mounting cavity 5, and the medium flow channels are independent of each other. Therefore, pure hydrogen can be introduced as the test medium, and different areas of the same sample are kept in contact with different flowing media at the same time. When introducing the test medium, the medium is introduced into the first mounting cavity 4 through the guide block 61, and the medium is introduced into the second mounting cavity 5 through the flow pipe 62 and the outlet pipe 63. During the introduction and outlet process, the medium flows, thereby making the test environment closer to the real working conditions of the fuel cell, thus improving the test effect.

[0039] In this preferred embodiment, the placement tank group 3 includes a cylindrical tank 31 and a dumbbell tank 32. The cylindrical tank 31 and the dumbbell tank 32 are located on the side where the upper pressure plate 1 and the bottom plate 2 are close to each other. The cylindrical tank 31 is located in the middle of the dumbbell tank 32, and the dumbbell tank 32 is close to the edge of the upper pressure plate 1 and the bottom plate 2. The cylindrical tank 31 and the dumbbell tank 32 form a sample pool with multiple independent flow channels. The standard cylindrical sample and the dumbbell-shaped sample strip are placed into the cylindrical tank 31 and the dumbbell tank 32 required for rubber tensile and compression tests. The sample pool is then wrapped in a heating jacket, which can achieve an environment in which the sample is in continuous contact with the flowing medium at a specified temperature.

[0040] The first mounting cavity 4 is a rectangular cavity and is located below the dumbbell groove 32; the second mounting cavity 5 is cylindrical and is located below the cylindrical groove 31.

[0041] A sealing strip 7 is fixedly connected to the edges of the cylindrical groove 31 and the dumbbell groove 32. The sealing strip 7 is made of elastic material and is used to seal the connection gap between the cylindrical groove 31 and the dumbbell groove 32. When a medium (such as any one of hydrogen, pure oxygen, air, nitrogen, or coolant) is introduced into the cylindrical groove 31 and the dumbbell groove 32, the connection is sealed and reinforced by multiple sealing strips 7 to prevent the medium from flowing out.

[0042] A connecting component 8 is provided between the upper pressure plate 1 and the bottom plate 2. The connecting component 8 is used to connect and fix the upper pressure plate 1 and the bottom plate 2, so that the upper pressure plate 1 and the bottom plate 2 are fixedly connected. Multiple connecting components 8 are provided between multiple placement slots 3.

[0043] The connecting assembly 8 includes a fixing bolt 81 and a fixing groove 82. The fixing groove 82 is located on the upper side of the base plate 2. The upper pressure plate 1 has a threaded hole corresponding to the fixing groove 82. The fixing bolt 81 passes through the threaded hole and is threadedly connected to the fixing groove 82. The test standard sample is placed in the placement groove 3 of the base plate 2, the upper pressure plate 1 is covered, and the base plate 2 and the upper pressure plate 1 are locked with the fixing bolt 81. The flow channel at the placement groove 3 is sealed by the standard sample itself. By adjusting the tightening torque of the fixing bolt 81, the sample stress can be adjusted to the range of 0.5MPa to 1.5MPa.

[0044] A base 10 is provided below the base plate 2. The base 10 is located below the base plate 2 and a limit ring 11 is fixedly connected to its surface. The limit ring 11 is used to limit the position of the base plate 2. During the test, the position of the base plate 2 needs to be fixed by the limit ring 11.

[0045] A lifting assembly 9 is provided on the base 10. The lifting assembly 9 is used to drive the upper pressure plate 1 to move up and down. In order to facilitate the closing between the upper pressure plate 1 and the base plate 2, the upper pressure plate 1 is moved by the lifting assembly 9.

[0046] The lifting assembly 9 includes telescopic columns 91, connecting frames 92, and connecting seats 93. Four telescopic columns 91 are vertically fixed to the four corners of the base 10. Two connecting frames 92 are fixedly connected to the upper ends of two telescopic columns 91 on one side. The connecting frames 92 are triangular. The upper end of the connecting seat 93 is fixedly connected to the bend of the connecting frame 92, and the bottom surface is fixedly connected to the upper pressure plate 1. When the sample is placed inside the placement slot 3 of the base plate 2, the telescopic columns 91 drive the connecting frames 92 to move up and down, thereby driving the upper pressure plate 1 to move down. The placement slot 3 on the upper pressure plate 1 holds the sample between the upper pressure plate 1 and the base plate 2. This method can quickly seal and transfer samples, facilitates rapid sample fixation and rapid testing of a large number of samples, and improves testing efficiency.

[0047] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An accelerated aging test device for a fuel cell sealing structure, comprising: The upper pressure plate (1) and the bottom plate (2) are characterized in that the upper pressure plate (1) and the bottom plate (2) are rectangular plates of the same shape and size, and the bottom plate (2) and the upper pressure plate (1) are provided with placement slots (3) on the side close to each other, and a plurality of placement slots (3) are provided on the side of the bottom plate (2) and the upper pressure plate (1). The upper pressure plate (1) and the bottom plate (2) are provided with a first mounting cavity (4) and a second mounting cavity (5). The first mounting cavity (4) and the second mounting cavity (5) are located below the placement trough group (3). The first mounting cavity (4) is located on the side of the upper pressure plate (1) and the bottom plate (2) near the outer edge, and the upper pressure plate (1) and the bottom plate (2) are provided with mounting grooves on their edges. The first mounting cavity (4) and the second mounting cavity (5) are provided with a feeding assembly (6). The feeding assembly (6) is used to introduce the medium into the placement trough group (3). The feeding assembly (6) includes a guide block (61), a flow tube (62), an outlet tube (63), and a feed tube (64). The two feed tubes (64) are fitted inside the mounting groove. The two flow tubes (62) are fixedly connected to the ends of the feed tubes (64) and pass through the first mounting cavity (4) and the second mounting cavity (5) respectively. The guide block (61) communicates with the flow tubes (62) and is located inside the first mounting cavity (4). The outlet tube (63) is fixedly connected to the ends of the two flow tubes (62). The flow tubes (62) are wavy and are located inside the second mounting cavity (5).

2. The accelerated aging test device for a fuel cell sealing structure according to claim 1, characterized in that, The placement slot group (3) includes a cylindrical slot (31) and a dumbbell slot (32). The cylindrical slot (31) and the dumbbell slot (32) are opened on the side of the upper pressure plate (1) and the bottom plate (2) that are close to each other. The cylindrical slot (31) is located in the middle of the dumbbell slot (32), and the dumbbell slot (32) is close to the edge of the upper pressure plate (1) and the bottom plate (2).

3. The accelerated aging test device for a fuel cell sealing structure according to claim 2, characterized in that, The first mounting cavity (4) is a rectangular cavity and is located below the dumbbell groove (32), and the second mounting cavity (5) is cylindrical and is located below the cylindrical groove (31).

4. The accelerated aging test device for a fuel cell sealing structure according to claim 2, characterized in that, A sealing strip (7) is fixedly connected to the edges of the cylindrical groove (31) and the dumbbell groove (32). The sealing strip (7) is made of elastic material and is used to seal the connection gap between the cylindrical groove (31) and the dumbbell groove (32).

5. The accelerated aging test device for a fuel cell sealing structure according to claim 1, characterized in that, A connecting component (8) is provided between the upper pressure plate (1) and the bottom plate (2). The connecting component (8) is used to connect and fix the upper pressure plate (1) and the bottom plate (2) so that the upper pressure plate (1) and the bottom plate (2) are fixedly connected. Multiple connecting components (8) are provided between multiple placement slots (3).

6. The accelerated aging test device for a fuel cell sealing structure according to claim 5, characterized in that, The connecting assembly (8) includes a fixing bolt (81) and a fixing groove (82). The fixing groove (82) is opened on the upper side of the base plate (2). The upper pressure plate (1) has a threaded hole corresponding to the fixing groove (82). The fixing bolt (81) passes through the threaded hole and is threadedly connected to the fixing groove (82).

7. The accelerated aging test device for a fuel cell sealing structure according to claim 1, characterized in that, A base (10) is provided below the base plate (2). The base (10) is located below the base plate (2) and a limiting ring (11) is fixedly connected to its surface. The limiting ring (11) is used to limit the position of the base plate (2).

8. The accelerated aging test device for a fuel cell sealing structure according to claim 1, characterized in that, The base (10) is provided with a lifting component (9), which is used to drive the upper pressure plate (1) to move up and down.

9. The accelerated aging test device for a fuel cell sealing structure according to claim 8, characterized in that, The lifting assembly (9) includes telescopic columns (91), connecting frames (92) and connecting seats (93). The four telescopic columns (91) are vertically fixed to the four corners of the base (10). The two connecting frames (92) are respectively fixed to the upper ends of the two telescopic columns (91) on one side. The connecting frames (92) are triangular. The upper end of the connecting seat (93) is fixed to the bend of the connecting frame (92), and the bottom surface is fixed to the upper pressure plate (1).

Images