Fuel cell membrane electrode single sample clamp
By abolishing the distribution area in the fuel cell single-piece sample fixture and adopting the runner area and main pipe structure, combining avoiding the pipeline and optimizing the main pipe width, the problem of uneven gas distribution in the prior art is solved, and a more efficient fuel cell testing is achieved.
Patent Information
- Application Number
- CN202420587286.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-25
- Publication Date
- 2025-03-25
- Estimated Expiration
- 2034-03-25
AI Technical Summary
During the testing process, the existing fuel cell single-piece sample fixtures are difficult to process due to the complex distribution zone structure and high sealing requirements, which leads to an increase in flow resistance, affecting the uniformity of gas distribution, and thus reducing the efficiency of the fuel cell.
A single-piece sample fixture of fuel cell membrane electrode was designed, the original distribution area was cancelled, and the structure of the flow channel area, the inflow main pipe and the outflow main pipe were adopted. By setting up a avoidance pipeline and optimizing the width of the main pipe, the uniformity of gas distribution was improved.
It realizes a more easy-to-machining fixture structure, reduces flow resistance, reduces the pressure requirement for external gas source, and achieves uniform gas distribution in the test, improving the accuracy and reliability of fuel cell testing.
Smart Images
Figure CN222671839U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of fuel cells, in particular to a fuel cell membrane electrode monolithic sample fixture. Background Art
[0002] In the early stages of fuel cell development, 9cm 2 or 12cm 2 The single-chip sample of the battery is tested. During the test, the distribution of the reaction gas will have a great impact on the performance of the battery. When the reaction gas is partially lost, it will cause uneven current distribution and reduce the overall efficiency of the fuel cell. In severe cases, it will cause irreversible damage to the proton exchange membrane. Therefore, it is also necessary to ensure the uniformity of gas distribution during the test, so as to make the test results more accurate and more reliable.
[0003] Most of the existing battery single chip sample fixtures are as shown in the instruction manual. Figure 1 The structure shown in the figure specifically includes an inlet, a main pipe, a distribution area, a flow channel and an outlet. However, due to the complex structure of the distribution area, it is difficult to process and has high requirements for sealing. At the same time, it will cause the flow resistance to increase and has high requirements for the external air supply system. Utility Model Content
[0004] The purpose of the utility model is to solve the above problems and provide a fuel cell membrane electrode monolithic sample fixture.
[0005] In order to achieve the above-mentioned purpose, the utility model specifically adopts the following technical solutions:
[0006] A fuel cell membrane electrode monolithic sample fixture, comprising a flow channel area, an inflow manifold and an outflow manifold respectively arranged on both sides of the flow channel area;
[0007] A reactant inlet is provided at one end of the inflow manifold, and a reactant outlet is provided at one end of the outflow manifold;
[0008] Avoidance pipelines are arranged at the connection between the reactant inlet and the flow channel area, and at the connection between the reactant outlet and the flow channel area.
[0009] As a further description of the above technical solution, the flow channel area is composed of a plurality of flow channel arrays, and the inflow main pipe and the outflow main pipe are arranged in parallel at both ends of the flow channel.
[0010] As a further description of the above technical solution, the width of the avoidance pipeline is equal to the width occupied by the three flow channels.
[0011] As a further description of the above technical solution, the reactant inlet and the reactant outlet are respectively arranged on obliquely opposite sides of the flow channel area.
[0012] As a further description of the above technical solution, the width of the inlet main pipe and the flow channel main pipe is 5 mm.
[0013] As a further description of the above technical solution, the inflow main pipe and the outflow main pipe are symmetrically arranged with respect to the flow channel area, and the inflow main pipe and the outflow main pipe have the same size specifications.
[0014] As a further description of the above technical solution, the clamp is made of metal.
[0015] As a further description of the above technical solution, when the fixture tests the air flow rate at 6 LPM, the flow distribution uniformity is -5.8% to 7.1%.
[0016] As a further description of the above technical solution, when the fixture tests a hydrogen flow rate of 2.5 LPM, the flow distribution uniformity is -0.6% to 1.1%.
[0017] The beneficial effects of the utility model are as follows:
[0018] 1. The utility model eliminates the original distribution area, making it easier to process, while reducing the flow resistance of the fixture, reducing the demand for external gas source pressure, and solving the problem of uneven flow distribution during battery sample testing. Under harsh conditions, the air flow rate is 6LPM, and the flow distribution uniformity reaches -5.8% to 7.1%; when the hydrogen flow rate is 2.5LPM, the flow distribution uniformity reaches -0.6% to 1.1%.
[0019] In order to more clearly illustrate the structural features and functions of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 is a schematic diagram of a fixture in the prior art;
[0021] Figure 2 It is a three-dimensional diagram of the test fixture in the utility model;
[0022] Figure 3 It is another stereoscopic diagram of the test fixture in the utility model;
[0023] Figure 4 The simulation results of flow distribution uniformity of a single flow channel under different total pipe widths;
[0024] Figure 5 The simulation test results are at an air flow rate of 6 LPM;
[0025] Figure 6 The figure shows the simulation test results at an air flow rate of 2 LPM.
[0026] Figure numerals: 1. distribution area; 2. inflow main pipe; 3. flow channel area; 4. outflow main pipe; 5. reactant inlet; 6. reactant outlet; 7. avoidance pipeline. DETAILED DESCRIPTION
[0027] In order to make the purpose, technical solution and advantages of the embodiments of the present utility model clearer, the technical solution in the embodiments of the present utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the present utility model.
[0028] like Figure 2 - Figure 3 As shown, in one embodiment, a fuel cell membrane electrode monolithic sample fixture is used to 2 or 12cm 2 The flow distribution uniformity test of the battery single chip sample is carried out. The specific structure includes a flow channel area 3, which is arranged by multiple flow channels arranged in parallel. The two ends of the flow channel area 3 are respectively provided with an inflow main pipe 2 and an outflow main pipe 4. The incoming air or hydrogen enters the flow channel through the main pipes and then flows out from the main pipes. A reactant inlet 5 is provided at one end of the inflow main pipe 2, and an avoidance pipeline 7 is provided between the reactant inlet 5 and the inflow main pipe 2. For details, please refer to Figure 2 The structure in the middle frame is the avoidance pipeline 7. Similarly, the other end of the flow channel area 3 is provided with an outflow main pipe 4, and one end of the outflow main pipe 4 is also provided with an avoidance pipeline 7 and a reactant outlet 6. In the clamp of the present application, the original distribution area 1 is eliminated, which is easier to process, and at the same time, the flow resistance of the clamp can be reduced, and the pressure requirement of the external gas source is reduced.
[0029] Furthermore, the reactant inlet 5 and the reactant outlet 6 are respectively arranged at diagonally opposite sides of the flow channel area 3, and the inflow manifold 2 and the outflow manifold 4 are arranged in parallel at both ends of the flow channel.
[0030] Furthermore, the clamp is made of metal material, which has a longer service life.
[0031] See also Figure 4 In the study, the applicant found that when the width of the inlet main pipe 2 and the outlet main pipe 4 is 2 mm, the distribution uniformity between the flow channels is poor, and when the width reaches 5 mm, the distribution uniformity between the flow channels is significantly improved. When the width of the main pipe is increased to 7 mm, the effect is not significant. Therefore, a model with a main pipe width of 5 mm is selected for further optimization.
[0032] refer to Figure 5 - Figure 6 When optimizing the fixture model, the applicant found that increasing the distance between the inlet and the first flow channel and the distance between the outlet and the last flow channel, i.e., avoiding the pipeline 7, can effectively reduce the situation where the flow of the front several flow channels is high, thereby improving the uniformity of flow distribution among the flow channels. Figure 5 , at 6LPM air flow, from the basic model to the optimized model, the flow deviation between flow channels is reduced from -28.5% to 33.9% to -5.8% to 7.1%. Figure 6 , the uniform distribution under small flow rate is verified as follows. At 2.5LPM hydrogen flow rate, the distribution deviation between flow channels is -0.6% to 1.1%. By optimizing the inlet structure and avoiding several flow channels at the front end of the flow, it is found that when the total pipe width is 5mm, the flow rate of the three flow channels at the front end is too high, so the avoidance length should be selected to be the width occupied by the three flow channels.
[0033] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A fuel cell membrane electrode monolithic sample fixture, characterized in that: It includes a flow channel area, an inflow main pipe and an outflow main pipe respectively arranged on both sides of the flow channel area; A reactant inlet is provided at one end of the inflow manifold, and a reactant outlet is provided at one end of the outflow manifold; Avoidance pipelines are arranged at the connection between the reactant inlet and the flow channel area, and at the connection between the reactant outlet and the flow channel area.
2. The fuel cell membrane electrode monolithic sample fixture according to claim 1, characterized in that: The flow channel area is composed of a plurality of flow channels arranged in an array, and the inflow main pipe and the outflow main pipe are arranged in parallel at both ends of the flow channel.
3. The fuel cell membrane electrode monolithic sample fixture according to claim 2, characterized in that: The width of the avoidance pipeline is equal to the width occupied by the three flow channels.
4. The fuel cell membrane electrode monolithic sample fixture according to claim 1, characterized in that: The reactant inlet and the reactant outlet are respectively arranged at obliquely opposite sides of the flow channel area.
5. The fuel cell membrane electrode monolithic sample fixture according to claim 1, characterized in that: The width of the inflow main pipe and the outflow main pipe is 5 mm.
6. The fuel cell membrane electrode monolithic sample fixture according to claim 1, characterized in that: The inflow main pipe and the outflow main pipe are symmetrically arranged with respect to the flow channel area, and the inflow main pipe and the outflow main pipe have the same size specifications.
7. The fuel cell membrane electrode monolithic sample fixture according to claim 1, characterized in that: The clamp is made of metal.
8. The fuel cell membrane electrode monolithic sample fixture according to claim 1, characterized in that: When the fixture is tested with an air flow rate of 6 LPM, the flow distribution uniformity is -5.8% to 7.1%.
9. The fuel cell membrane electrode monolithic sample fixture according to claim 1, characterized in that: When the fixture is used to test a hydrogen flow rate of 2.5 LPM, the flow distribution uniformity is -0.6% to 1.1%.