Clamp for testing conductivity of CCM catalyst layer

Abstract

The utility model discloses a CCM catalyst layer conductivity test fixture, which comprises an upper end plate and a lower end plate, and a CCM film needing to be detected is fixed between the upper end plate and the lower end plate in a threaded connection manner; the upper end plate and the lower end plate are respectively provided with a plurality of through holes in a central area perpendicular to the surface, conductive columns are fixedly arranged in the through holes, one end of each conductive column is flush with the inner surface, and the other end of each conductive column is higher than the outer surface and is used for being connected with an electrode clamp; positioning holes are correspondingly formed in the inner surfaces of the upper end plate and the lower end plate and used for positioning the CCM film through positioning pins, and through temperature detection holes are formed in the upper end plate and the lower end plate and used for detecting the temperature in the clamp. The device can be used for simulating the working environment of the CCM catalyst layer, real electronic conductivity detection and feedback of the CCM catalyst layer under different working temperature and pressure conditions can be realized, and the integrity of a CCM film for testing can be ensured.

Description

TECHNICAL FIELD

[0001] The utility model belongs to proton exchange membrane fuel cell and water electrolysis field, especially relate to a CCM catalytic layer conductivity test fixture. BACKGROUND

[0002] With the gradual development of hydrogen energy field, hydrogen energy gradually occupies an important position in numerous energy. The commercialization and scale trend of proton exchange membrane fuel cell (PEMFE) and proton exchange membrane water electrolytic tank (PEMWE) is more and more obvious.

[0003] Proton exchange membrane fuel cell is a kind of high efficiency, low pollution, noiseless energy conversion device, can convert hydrogen energy into electric energy, or electric energy into hydrogen energy. According to energy demand, electric energy and hydrogen energy can be converted efficiently to realize the efficient utilization of renewable energy. Membrane electrode (CCM, Catalyst Coated Membrane) is a kind of catalyst / proton exchange membrane assembly made by coating fuel cell catalyst on both sides of proton exchange membrane, is the key component of battery, is the place of electrochemical reaction, energy conversion and multiphase material transport. CCM catalytic layer, composed of ionomer and catalyst, can conduct proton, electron, and is the main place of chemical reaction. Electronic transmission efficiency seriously affects the chemical reaction rate of catalytic layer, and it is very important to carry out research on it.

[0004] As the core of chemical reaction, the electronic transmission path of catalytic layer is mostly from the external circuit to the surface of catalytic layer through gas diffusion layer, then the electron is transmitted to each reaction site through catalytic layer to occur chemical reaction or the electron produced by chemical reaction at each reaction site is transmitted to the surface of catalytic layer through catalytic layer and finally flows into the external circuit through diffusion layer. No matter which path, the cross-section electronic transmission impedance of catalytic layer is particularly critical. In previous numerous researches, the test of CCM catalytic layer conductivity has many limitations. The common way to test CCM catalytic layer conductivity is surface conductivity test, which cannot test the cross-section conductivity of catalytic layer, therefore, it is urgent to design a tool capable of testing the cross-section conductivity of CCM catalytic layer under different temperature and pressure conditions. UTILITY MODEL CONTENT

[0005] In view of the above problems, the utility model provides a CCM catalytic layer conductivity test fixture.

[0006] A kind of CCM catalytic layer conductivity test fixture, comprising: upper end plate and lower end plate, the CCM film needing to be probed is fixed between the upper end plate and lower end plate by threaded connection, the surface of the upper end plate and lower end plate and the CCM film contact is inner surface, the other surface is outer surface;The upper end plate and lower end plate are respectively provided with a plurality of through holes perpendicular to surface in central region, the through hole is fixed with electrically conductive column, one end of the electrically conductive column is flush with the inner surface, the other end of the electrically conductive column is higher than the outer surface for connecting electrode clamp;The inner surface of the upper end plate and lower end plate is correspondingly provided with positioning hole for positioning the CCM film by positioning pin;The upper end plate and lower end plate are both provided with through temperature detection hole for detecting the temperature in the fixture.

[0007] Preferably, the upper end plate and lower end plate are provided with 2 through holes at each edge, the through hole of the upper end plate is smooth round hole, the through hole of the lower end plate is threaded hole, and the shrinkage force is applied between the upper end plate and lower end plate by threaded screw.

[0008] Preferably, the threaded screw is provided with 4-10 spring washers.

[0009] Preferably, the area of the region where the electrically conductive column is arranged on the upper end plate and lower end plate is slightly smaller than the area of the effective test area.

[0010] Preferably, one end of the electrically conductive column which is higher than the outer surface of the upper end plate and lower end plate is flattened.

[0011] Preferably, the number of the electrically conductive column is 9-16.

[0012] Preferably, the positioning hole is located in the position within the effective test area on the inner surface of the upper end plate and lower end plate.

[0013] Preferably, the number of the positioning hole is 2 or 4.

[0014] Preferably, the upper end plate and lower end plate are both non-conductive insulating plate.

[0015] The utility model has the following beneficial effects:

[0016] The utility model discloses a kind of CCM catalytic layer conductivity test fixture. It can be used to simulate CCM catalytic layer working environment, and can realize real electronic conductivity detection feedback of CCM catalytic layer under different working temperature and pressure conditions. Furthermore, the utility model can guarantee the integrity of CCM film for testing, and still can be used for electrochemical test after testing electronic conductivity, reduce cost. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1is an exploded view of the CCM catalytic layer conductivity test fixture of the utility model.

[0018] Figure 2 is an end plate top view schematic diagram of the CCM catalytic layer conductivity test fixture of the utility model.

[0019] Figure 3 is a perspective view of the CCM catalytic layer conductivity test fixture of the preferred embodiment of the utility model.

[0020] Figure 4 is a perspective view of the CCM catalytic layer conductivity test fixture of another preferred embodiment of the utility model. DETAILED DESCRIPTION

[0021] The embodiments of the utility model will be described below in conjunction with the drawings of the specification. It should be noted that the embodiments involved in the specification are not exhaustive, and do not represent the only embodiment of the utility model. The following examples are only to clearly illustrate the utility model content of the utility model patent, and are not limited to the embodiments thereof. For ordinary skilled in the art, on the basis of the example description, different forms of changes and modifications can also be made, and any changes or modifications within the scope of the utility model are within the protection scope of the utility model.

[0022] Figure 1 is an exploded view of the CCM catalytic layer conductivity test fixture of the utility model, Figure 2 is an end plate top view schematic diagram of the CCM catalytic layer conductivity test fixture of the utility model. As Figures 1-2 indicated, the CCM catalytic layer conductivity test fixture of the utility model comprises two identical upper end plates 1 and lower end plates 1', and the CCM film to be detected is fixed between the upper end plate 1 and the lower end plate 1' through a threaded connection mode. Preferably, the upper end plate 1 and the lower end plate 1' are applied with a shrinkage force through a through-hole screw 2. Preferably, 4-10 spring washers (not shown) are inserted into the through-hole screw 2, which can be used to ensure that the size of the shrinkage force at different temperatures does not change greatly. The surface of the upper and lower end plates (1, 1') in contact with the CCM film is the inner surface, and the other surface opposite to the inner surface is the outer surface. The conductive column 3 on the outer surface of the upper end plate 1 and the conductive column (not shown) on the outer surface of the lower end plate 1' are used to connect the electrode clamp (not shown). Preferably, the upper end plate 1 and the lower end plate 1' are non-conductive insulating plates. Figure 1

[0023] Since the upper end plate 1 and the lower end plate 1' are identical in structure, the following will be described in conjunction with the upper end plate 1. Figure 2 ​The end plate structure is described in detail. The upper end plate 1 has two through holes 12 on each edge, both of which are threaded holes. In another preferred embodiment, the through holes 12 on the upper end plate 1 are smooth round holes, and the through holes 12' on the lower end plate 1' are threaded holes. A torque wrench (not shown) is used to tighten the screws 2 one by one in a diagonal manner in the threaded holes 12 to apply a tightening force to the clamp. Preferably, the torque can be set to 3-10 N·m.

[0024] In each preferred embodiment, the square area at the center of the upper end plate 1 serves as the effective test area 6 (corresponding to the CCM film area). A plurality of through holes 13 perpendicular to the surface are provided within an area 7 slightly smaller than the effective test area at the center. Conductive posts 3 are fixedly installed within the through holes 13. Preferably, the through holes 13 can be threaded holes, and one end of the conductive post 3 has a corresponding thread on its outer surface, with the two connected by threads. Preferably, the effective test area 6 has an area of ​​5*5cm, and the area 7 where the conductive posts are installed has an area of ​​4*4cm. One end of the conductive post 3 is flush with the inner surface of the end plate 1 and does not extend beyond the lower end plate 1'. The other end of the conductive post 3 slightly protrudes above the outer surface of the upper end plate 1 (e.g., ...). Figure 1 , 3 As shown in Figure 4), it is used to connect the electrode clamp (not shown). Preferably, the protruding part is approximately 0.1 cm long. More preferably, the protruding part of the conductive post 3 is flattened so that it is smaller than the lower diameter of the conductive post 3, which facilitates the clamping connection between the electrode clamp and the conductive post 3. The number of conductive posts 3 can be determined according to the experimental scheme. Preferably, the number of conductive posts 3 is 9-16, and the spacing between them is 1-2 cm. More preferably, the number of conductive posts 3 is 9, 12, or 13. Figure 3 The figure shows a preferred embodiment of the present invention with nine conductive pillars. Figure 4 The diagram shows a preferred embodiment of this invention with 13 conductive pillars. Preferably, the conductive pillar material includes one or more of copper, aluminum, and silver.

[0025] In each preferred embodiment, the inner surface of the upper end plate 1 is provided with positioning holes 14 for positioning the CCM film via positioning pins 4. The positioning holes 14 are located within the effective test area 6 on the inner surface of the upper end plate 1. Preferably, there are two or four positioning holes, located relative to each other within the upper end plate 1 and the effective test area 6 at a distance of 0.62 cm from the edge. The positioning holes 14 do not penetrate the end plate 1, have a depth of 0.5 cm, and a diameter of 0.3 cm. Positioning pins 4 are disposed within the positioning holes 14. Preferably, the positioning pins are made of wood, PTFE, or aluminum alloy.

[0026] The upper end plate 1 has a through temperature detecting hole 15 inside for detecting the temperature in the clamp, and the temperature detecting hole 15 does not interfere with the threaded holes 12, the through holes 13 and the positioning holes 14. Preferably, the temperature detecting hole is through from one side surface of the end plate 1 to the other side surface, and is about 0.2 cm away from the inner surface. Preferably, the temperature detecting hole 15 has a diameter of 0.3 cm.

[0027] The utility model discloses can measure the conductivity of CCM catalytic layer through changing the measuring condition of different tightness force under the same temperature condition or the same tightness force under different temperature, and the implementation mode is that the heating temperature of the clamp is changed or the torque of the torque wrench is changed.

[0028] The method for measuring the conductivity of CCM catalytic layer by using the utility model is further explained by taking the detection condition of 60 DEG C and 6N·m tightness force as an example.

[0029] First step: CCM film pretreatment: the completely prepared CCM film or semi-CCM film is soaked in deionized water for 1 hour to ensure that the CCM film has sufficient moisture;

[0030] Second step: CCM film hole making: the wet CCM film is taken out, and the CCM is made into holes by using a hole puncher, and the circular hole diameter is 0.3 cm, and the size is matched with the positioning pin 4;

[0031] Third step: clamp assembly: the lower end plate 1' is turned over, the inner surface with the positioning hole 14' faces upwards, and the outer surface faces downwards, the positioning pin 4 is inserted into the positioning hole 14', the prepared CCM film is inserted into the positioning pin 4 and placed on the inner surface of the lower end plate 1', the inner surface positioning hole 14 of the upper end plate 1 is aligned with the positioning pin 4, and the screw 2 is placed in the eight threaded holes 12 on the outer surface of the upper end plate 1. The torque wrench (not shown) is used in a diagonal manner, and the screws are tightened pair by pair, and the torque of the torque wrench is set to 6N·m;

[0032] Fourth step: clamp heating: the temperature detecting device (not shown) is placed in the temperature detecting hole 15 or 15' of the upper end plate 1 or the lower end plate 1', and the clamp is placed on the heating plate for heating, and the final temperature is set to 60 DEG C;

[0033] Fifth step: electronic conduction impedance test and calculation: the conductive column 3 of the upper end plate 1 is respectively named as A1, A2…A9, and the conductive column 3' of the lower end plate 1' is respectively named as B1, B2…B9. Using the alligator conductive clamp of the digital bridge, A2 and B2, A4 and B4, A6 and B6, A8 and B8 and A5 and B5 are connected respectively, and the electronic conduction impedance of the CCM section can be obtained. The electronic conduction impedance of the half CCM is subtracted from the electronic conduction impedance of the proton exchange membrane, and the cross-sectional electronic conduction impedance of each group of catalytic layers under the condition of 60℃ and 6N·m tightness can be obtained. Through the calculation of the average value of the 5 groups, the average electronic conduction impedance of the CCM catalytic layer section can be obtained. Using the alligator conductive clamp of the digital bridge, A5 and A1, A5 and A3, A5 and A1 and A7 and A9 are connected respectively, and the size of each group of electronic conduction impedance under the condition of 60℃ and 6N·m tightness can be obtained, and the uniformity of the catalytic layer can be judged according to whether the electronic impedance is similar. The conductivity calculation adopts the formula σ=L / R, and the surface or cross-sectional conductivity of the CCM per unit length is calculated.

[0034] Obviously, those skilled in the art should recognize that the above embodiments are only used to illustrate the present application, and are not used as a limitation on the present application, as long as the changes and modifications of the above described embodiments are within the scope of the essential spirit of the present application, they will fall within the scope of the claims of the present application.

Claims

1. A CCM catalytic layer conductivity test fixture, characterized by, Comprise: upper and lower end plates, which are fixed by screwing to the CCM film to be detected, the inner surface of the upper and lower end plates is in contact with the CCM film, and the other surface is the outer surface; a plurality of through holes are vertically arranged on the central area of the upper and lower end plates, and a conductive column is fixed in each through hole, one end of the conductive column is flush with the inner surface, and the other end of the conductive column is higher than the outer surface for connecting the electrode clamp; the inner surface of the upper and lower end plates is correspondingly provided with a positioning hole for positioning the CCM film by a positioning pin; and the inner surface of the upper and lower end plates is provided with a through temperature detection hole for detecting the temperature in the clamp.

2. The CCM catalytic layer conductivity test fixture of claim 1, wherein, The upper and lower end plates are provided with two through holes at each edge, the through hole of the upper end plate is a smooth round hole, and the through hole of the lower end plate is a threaded hole, and the upper and lower end plates are tightened by a through screw.

3. The CCM catalytic layer conductivity test fixture of claim 2, wherein, The through screw is provided with 4-10 spring washers.

4. The CCM catalytic layer conductivity test fixture of claim 1, wherein, The area of the region provided with the conductive column on the upper and lower end plates is smaller than the area of the effective test region.

5. The CCM catalytic layer conductivity test fixture of claim 1, wherein, The end of the conductive column higher than the outer surface of the upper and lower end plates is flattened.

6. The CCM catalytic layer conductivity test fixture of claim 5, wherein, The number of the conductive columns is 9-16.

7. The CCM catalytic layer conductivity test fixture of claim 1, wherein, The positioning hole is located in the effective test region on the inner surface of the upper and lower end plates.

8. The CCM catalytic layer conductivity test fixture of claim 7, wherein, The number of the positioning holes is 2 or 4.

9. The CCM catalytic layer conductivity test fixture of claim 1, wherein, The upper and lower end plates are both non-conductive insulating plates.

Images