Diaphragm conductivity test fixture and diaphragm conductivity test method

Abstract

The application provides a diaphragm conductivity test clamp and a diaphragm conductivity test method. The diaphragm conductivity test clamp comprises: a first liquid storage tank and a second liquid storage tank, the first liquid storage tank is provided with a first liquid inlet and a first conducting port, the second liquid storage tank is provided with a second liquid inlet and a second conducting port, and the first conducting port and the second conducting port are correspondingly arranged; a first electrode and a second electrode, the first electrode is arranged in the first liquid storage tank, and the second electrode is arranged in the second liquid storage tank; and a filling pad, which is clamped between the first liquid storage tank and the second liquid storage tank, and is provided with a communication port penetrating through the filling pad, the first conducting port and the second conducting port are communicated through the communication port, and the area of the first conducting port, the area of the second conducting port, the projection area of the first electrode on the filling pad and the projection area of the second electrode on the filling pad are all greater than the area of the communication port. Through the scheme, the problem of poor test precision of a liquid flow battery diaphragm can be solved.

Description

Technical Field

[0001] This invention relates to the field of flow battery technology, and more specifically, to a membrane conductivity testing fixture and a membrane conductivity testing method. Background Technology

[0002] Flow batteries are an energy storage technology that converts electrical energy into chemical energy through redox reactions in the electrolyte at both positive and negative electrodes. They are characterized by high capacity, wide applicability, and long cycle life, making them a valuable new energy product. The separator is a key component of a flow battery, preventing short circuits between the positive and negative electrodes and conducting protons to maintain circuit continuity. Conductivity, reflecting the electrolyte's ion transport capacity, is a crucial physical parameter of the flow battery separator. Separator conductivity directly affects the internal resistance of the flow battery, thus influencing its voltage efficiency and energy efficiency.

[0003] In related technologies, impedance is measured using variable frequency AC scanning technology. Small-amplitude electrical signals are applied to both sides of the test system. These small-amplitude signals, by perturbing the system, avoid significant impact and ensure an approximately linear relationship between the perturbation and the system's response. Small-amplitude sinusoidal perturbation signals of different frequencies are applied to the electrode system, and the electrode impedance is obtained from the relationship between the electrode system's response and the perturbation signal. Using the AC impedance method on an electrochemical workstation, the electrolyte resistance and the combined resistance of the membrane and electrolyte are measured. After subtracting the electrolyte resistance, the membrane surface resistance is obtained. The membrane internal resistance is measured using the AC impedance method, and the membrane conductivity is calculated using relevant formulas.

[0004] However, when the sheet resistance of the ion exchange membrane is low, the conductivity testing device has a large testing error. Therefore, it is not possible to accurately test the flow battery separator with low sheet resistance. Summary of the Invention

[0005] This invention provides a membrane conductivity testing fixture and a membrane conductivity testing method to solve the problem of poor testing accuracy of flow battery membranes in related technologies.

[0006] According to one aspect of the present invention, a diaphragm conductivity testing fixture is provided, comprising: a first liquid storage tank and a second liquid storage tank, the first liquid storage tank having a first liquid inlet and a first conductive port communicating with its inner cavity, the second liquid storage tank having a second liquid inlet and a second conductive port communicating with its inner cavity, the first conductive port and the second conductive port being correspondingly disposed; a first electrode and a second electrode, the first electrode being disposed in the first liquid storage tank and the second electrode being disposed in the second liquid storage tank; and a filling pad sandwiched between the side wall of the first liquid storage tank having the first conductive port and the side wall of the second liquid storage tank having the second conductive port, the filling pad having a through-hole communicating port, the first conductive port and the second conductive port being connected through the communicating port, the area of ​​the first conductive port and the area of ​​the second conductive port being both larger than the area of ​​the communicating port, and the projected area of ​​the first electrode on the filling pad and the projected area of ​​the second electrode on the filling pad being both larger than the area of ​​the communicating port.

[0007] Furthermore, the ratio between the projected area of ​​the first electrode on the filling pad and the area of ​​the connection port is between 10 and 20; and / or, the ratio between the projected area of ​​the second electrode on the filling pad and the area of ​​the connection port is between 10 and 20.

[0008] Furthermore, the filling pad is a rubber pad.

[0009] Furthermore, the first electrode, the second electrode, the sidewall of the first liquid storage tank with the first conductive port, and the sidewall of the second liquid storage tank with the second conductive port are all arranged in parallel.

[0010] Furthermore, the projected area of ​​the first electrode on the filling pad is equal to the projected area of ​​the second electrode on the filling pad.

[0011] Furthermore, the diaphragm conductivity test fixture also includes connecting screws, and the first liquid reservoir, the filling pad, and the second liquid reservoir are connected by the connecting screws.

[0012] Furthermore, the projected area of ​​the first electrode on the filling pad is less than or equal to the area of ​​the first conductive port; and / or, the projected area of ​​the second electrode on the filling pad is less than or equal to the area of ​​the second conductive port.

[0013] Furthermore, both the first electrode and the second electrode are platinum sheets; and / or, the first conductive port, the second conductive port, and the connecting port are all circular structures.

[0014] According to another aspect of the present invention, a method for testing the conductivity of a diaphragm is provided, applied to the diaphragm conductivity testing fixture provided above. The method includes: clamping a filling pad between a first liquid storage tank and a second liquid storage tank; filling the first liquid storage tank and the second liquid storage tank with electrolyte respectively; energizing the first electrode and the second electrode respectively; measuring a first resistance R1; clamping the diaphragm to be tested and the filling pad between the first liquid storage tank and the second liquid storage tank; measuring a second resistance R2; and calculating the diaphragm conductivity based on the first resistance R1, the second resistance R2, the thickness L of the filling pad, and the area S of the connecting port.

[0015] Furthermore, after calculating the membrane conductivity based on the first resistor R1 and the second resistor R2, the membrane conductivity testing method further includes: measuring the first resistor R1 and the second resistor R2 multiple times, and calculating the membrane conductivity after each measurement; comparing the membrane conductivity calculated after multiple measurements to determine whether the membrane conductivity meets the accuracy requirements; if the membrane conductivity does not meet the accuracy requirements, repeating the following steps until the membrane conductivity meets the accuracy requirements: adjusting the area of ​​the connecting opening of the filling pad, measuring the first resistor R1 and the second resistor R2 multiple times, and calculating the membrane conductivity after each measurement to determine whether the membrane conductivity meets the accuracy requirements; if the membrane conductivity meets the accuracy requirements, using the average value of the membrane conductivity calculated multiple times as the membrane conductivity of the membrane to be tested.

[0016] According to the technical solution of this invention, the membrane conductivity testing fixture includes a first liquid reservoir, a second liquid reservoir, a first electrode, a second electrode, and a filling pad. When measuring the conductivity of the membrane, the filling pad is sandwiched between the first and second liquid reservoirs. Electrolyte is filled in both reservoirs. Alternating current is applied between the first and second electrodes, and the first resistance R1 of the electrolyte is measured. Then, the filling pad and the membrane to be tested are sandwiched between the first and second liquid reservoirs, and the second resistance R2 of the membrane and the electrolyte is measured. The conductivity of the membrane can be calculated based on the difference between R1 and R2. By placing the filling pad between the first and second liquid reservoirs, the first resistance R1 and the second resistance R2 are increased, thereby reducing the error caused by the testing fixture. Even when the sheet resistance of the membrane is low, the resistance of the membrane can be accurately tested. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0018] Figure 1 A schematic diagram of the structure of a diaphragm conductivity testing fixture provided according to an embodiment of the present invention is shown;

[0019] Figure 2 A flowchart of a membrane conductivity testing method provided according to an embodiment of the present invention is shown.

[0020] The above figures include the following reference numerals:

[0021] 10. First liquid storage tank; 11. First liquid inlet; 12. First conduction port;

[0022] 20. Second liquid storage tank; 21. Second liquid inlet; 22. Second conduction port;

[0023] 30. First electrode;

[0024] 40. Second electrode;

[0025] 50. Filler pad; 51. Connecting port. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] like Figure 1 As shown, this embodiment of the invention provides a diaphragm conductivity testing fixture, which includes a first liquid storage tank 10, a second liquid storage tank 20, a first electrode 30, a second electrode 40, and a filling pad 50. The first liquid storage tank 10 has a first liquid inlet 11 and a first conductive port 12 communicating with its inner cavity. The second liquid storage tank 20 has a second liquid inlet 21 and a second conductive port 22 communicating with its inner cavity. The first conductive port 12 and the second conductive port 22 are correspondingly arranged. The first electrode 30 is disposed in the first liquid storage tank 10, and the second electrode 40 is disposed in the first liquid storage tank 10. The filling pad 50 is sandwiched between the side wall of the first liquid storage tank 10 where the first conductive port 12 is provided and the side wall of the second liquid storage tank 20 where the second conductive port 22 is provided. The filling pad 50 has a through-hole communication port 51. The first conductive port 12 and the second conductive port 22 are connected through the communication port 51. The area of ​​the first conductive port 12 and the area of ​​the second conductive port 22 are both larger than the area of ​​the communication port 51. The projected area of ​​the first electrode 30 on the filling pad 50 and the projected area of ​​the second electrode 40 on the filling pad 50 are both larger than the area of ​​the communication port 51.

[0028] According to the technical solution of this invention, the membrane conductivity testing fixture includes a first liquid storage tank 10, a second liquid storage tank 20, a first electrode 30, a second electrode 40, and a filling pad 50. When measuring the conductivity of the membrane, the filling pad 50 is clamped between the first liquid storage tank 10 and the second liquid storage tank 20. Electrolyte is filled in the first and second liquid storage tanks. Alternating current is applied between the first electrode 30 and the second electrode 40, and the first resistance R1 of the electrolyte is measured. Then, the filling pad 50 and the membrane to be tested are clamped between the first and second liquid storage tanks 10 and 20, and the second resistance R2 of the membrane and the electrolyte is measured. The conductivity of the membrane to be tested can be calculated based on the difference between R1 and R2. By placing the filling pad 50 between the first and second liquid storage tanks 10 and 20, the first resistance R1 and the second resistance R2 can be increased, thereby reducing the error caused by the testing fixture. Even when the sheet resistance of the membrane is small, the resistance of the membrane can be accurately tested.

[0029] It should be noted that since the area of ​​the first conductive port 12, the area of ​​the second conductive port 22, the projected area of ​​the first electrode 30 on the filling pad 50, and the projected area of ​​the second electrode 40 on the filling pad 50 are all larger than the area of ​​the connecting port 51, the filling pad 50 can be used to increase the resistance of the electrolyte and the resistance of the electrolyte and the diaphragm under test.

[0030] In this embodiment, the filling pad 50 can be used to prevent leakage between the first liquid storage tank 10 and the second liquid storage tank 20.

[0031] The area of ​​the connecting port 51 can be adjusted according to the requirements. Reducing the area of ​​the connecting port 51 can increase the diaphragm test impedance, thereby reducing the test error caused by the electrochemical impedance test error and the deviation in the fixture assembly process. However, if the area of ​​the connecting port 51 is too small, it will cause the electrolyte surface tension to cause the electrolyte to not be fully wetted in the hole. Therefore, it is necessary to select an appropriate area of ​​the connecting port 51.

[0032] In this embodiment, the first electrode 30 is connected to a wire that extends to the outside of the first liquid storage tank 10. The second electrode 40 is connected to a wire that extends to the outside of the second liquid storage tank 20.

[0033] Specifically, the diaphragm to be tested needs to cover either the first conductive port 12 or the second conductive port 22.

[0034] like Figure 1As shown, the ratio between the projected area of ​​the first electrode 30 on the filling pad 50 and the area of ​​the connecting port 51 is between 10 and 20, and the ratio between the projected area of ​​the second electrode 40 on the filling pad 50 and the area of ​​the connecting port 51 is between 10 and 20. By using the above ratio range, the first resistance R1 and the second resistance R2 can be further increased, thereby improving the stability of the measured conductivity of the diaphragm.

[0035] The ratio between the projected area of ​​the first electrode 30 on the filling pad 50 and the area of ​​the connecting port 51 can be any value between 10, 12, 14, 16, 18, 20, and 10 to 20. Similarly, the ratio between the projected area of ​​the second electrode 40 on the filling pad 50 and the area of ​​the connecting port 51 can be any value between 10, 12, 14, 16, 18, 20, and 10 to 20.

[0036] Specifically, the filler pad 50 is a rubber pad. Using a rubber pad has the advantages of easy material sourcing and low cost.

[0037] like Figure 1 As shown, the first electrode 30, the second electrode 40, the sidewall of the first liquid storage tank 10 with the first conductive port 12, and the sidewall of the second liquid storage tank 20 with the second conductive port 22 are all arranged in parallel. This structure reduces the impact of errors in the test fixture and improves test accuracy.

[0038] like Figure 1 As shown, the projected area of ​​the first electrode 30 on the filling pad 50 is equal to the projected area of ​​the second electrode 40 on the filling pad 50. This structure offers the advantage of ease of setup. Furthermore, it reduces the impact of test fixture errors and improves test accuracy.

[0039] In this embodiment, the diaphragm conductivity testing fixture also includes connecting screws, and the first liquid storage tank 10, the filling pad 50, and the second liquid storage tank 20 are connected by the connecting screws. The use of connecting screws offers the advantage of easy assembly and disassembly.

[0040] like Figure 1 As shown, the projected area of ​​the first electrode 30 on the filling pad 50 is less than or equal to the area of ​​the first conductive port 12, and the projected area of ​​the second electrode 40 on the filling pad 50 is less than or equal to the area of ​​the second conductive port 22. With this configuration, sufficient electrolyte ions can pass through the first conductive port 12 and the second conductive port 22, thereby improving the stability of the conductivity test.

[0041] In this embodiment, both the first electrode 30 and the second electrode 40 are platinum sheets. Using platinum electrodes can reduce the test error caused by the impedance of the electrodes themselves.

[0042] Among them, the first conductive port 12, the second conductive port 22, and the connecting port 51 are all circular structures.

[0043] like Figure 2 As shown, another embodiment of the present invention provides a method for testing the conductivity of a diaphragm, applied to the diaphragm conductivity testing fixture provided above. The method for testing the conductivity of a diaphragm includes:

[0044] S100, The filling pad 50 is sandwiched between the first liquid storage tank 10 and the second liquid storage tank 20;

[0045] S200: Electrolyte is filled into the first liquid storage tank 10 and the second liquid storage tank 20 respectively. The first electrode 30 and the second electrode 40 are energized respectively to measure the first resistance R1.

[0046] S300. The diaphragm to be tested and the filling pad 50 are both clamped between the first liquid storage tank 10 and the second liquid storage tank 20, and the second resistance R2 is measured.

[0047] S400. Calculate the diaphragm conductivity based on the first resistor R1, the second resistor R2, the thickness L of the filling pad 50, and the area S of the connecting port 51.

[0048] Using the above testing method, a filling pad 50 is clamped between the first liquid storage tank 10 and the second liquid storage tank 20. Electrolyte is filled into the first and second liquid storage tanks 10 and 20. Alternating current is applied between the first electrode 30 and the second electrode 40, and the first resistance R1 of the electrolyte is measured. Then, the filling pad 50 and the diaphragm under test are clamped between the first and second liquid storage tanks 10 and 20, and the second resistance R2 of the diaphragm and the electrolyte is measured. The conductivity of the diaphragm can then be calculated. The filling pad 50 increases the first resistance R1 and the second resistance R2, thereby reducing the error caused by the test fixture. Even when the sheet resistance of the diaphragm is low, the resistance of the diaphragm can be accurately tested.

[0049] It should be noted that the diaphragm conductivity is calculated using the formula δ = L / (RS). Where δ is the diaphragm conductivity, L is the diaphragm thickness, R is the diaphragm test resistance, and S is the area of ​​the connecting port 51.

[0050] R is calculated from the difference between R2 and R1.

[0051] Specifically, after calculating the membrane conductivity based on the first resistance R1 and the second resistance R2, the membrane conductivity testing method further includes:

[0052] S500, measure the first resistance R1 and the second resistance R2 multiple times, and calculate the diaphragm conductivity after each measurement;

[0053] S600. Compare the membrane conductivity calculated after multiple measurements to determine whether the membrane conductivity meets the accuracy requirements.

[0054] S700. If the diaphragm conductivity does not meet the accuracy requirements, repeat the following steps until the diaphragm conductivity meets the accuracy requirements: Adjust the area of ​​the connecting port 51 of the filling pad 50, measure the first resistance R1 and the second resistance R2 multiple times, and calculate the diaphragm conductivity after each measurement to determine whether the diaphragm conductivity meets the accuracy requirements.

[0055] S800. If the membrane conductivity meets the accuracy requirements, the average value of the membrane conductivity obtained from multiple calculations shall be used as the membrane conductivity of the membrane to be tested.

[0056] In step S500, multiple membrane test resistances R are obtained based on multiple measurements of the first resistance R1 and the second resistance R2, allowing for the determination of multiple membrane conductivity values ​​under the same test conditions. In step S600, by comparing the multiple membrane conductivity values, it can be determined whether the obtained membrane conductivity meets the accuracy requirements. In step S700, by replacing the filling pad 50 and adjusting the area of ​​the connecting port 51 of the filling pad 50, a suitable area of ​​the connecting port 51 of the filling pad 50 can be found for different membranes, thus obtaining the conductivity of the membrane under test more accurately. In step S800, the conductivity of the membrane under test can be obtained.

[0057] The following describes the specific usage process of the diaphragm conductivity testing fixture with reference to a specific embodiment: Specific Implementation Example 1:

[0059] The conductivity of the Nafion 212 membrane was tested using the AC impedance method. The test temperature was 25℃±0.5℃, the AC impedance scan frequency was 1~105Hz, the amplitude was 10mV, and the initial voltage was 0V. The electrolyte used in the first and second reservoirs 10 was a 3.0mol / L sulfuric acid aqueous solution. The membrane under test was placed between a rubber gasket and the first reservoir 10. The thickness L of the membrane under test was 50μm. The first resistance R1 and the second resistance R2 were measured respectively to obtain the membrane test resistance R. The conductivity was then calculated using the conductivity formula δ=L / (RS).

[0060] It should be noted that the membrane to be tested needs to be pretreated before testing. The treatment conditions are 80 degrees Celsius and immersion in a 3.0 mol / L sulfuric acid solution for 3 hours. The platinum electrode is 2 cm × 4 cm in size. The first conductive port 12 and the second conductive port 22 are both circular holes with a radius between 1 and 3 cm. The distance between the two platinum electrodes is 4-10 cm.

[0061] Two tests were conducted. In the first test, the opening size of port 51 was A: 4cm. 2The opening size of the second connecting port 51 is B: 0.25cm. 2 Five tests were conducted, and the results are shown in the table below.

[0062] Table 1

[0063]

[0064] Table 2

[0065]

[0066] As shown in the table above, when the opening size of the rubber gasket is A, the test error is large due to the low membrane resistance and the lack of accuracy, resulting in poor consistency of the conductivity test results. When the opening size of the rubber gasket is B, the difference between the five conductivity test results is significantly reduced, and the test stability is significantly improved. Specific Implementation Example 2:

[0068] The conductivity of the commercial Kerun 212 membrane was tested using the aforementioned membrane conductivity test fixture under the same conditions. The specific test results are as follows.

[0069] Table 3

[0070]

[0071] Table 4

[0072]

[0073] As shown in the table above, when the opening size of the rubber gasket is A, the test error is large due to the low membrane resistance and the lack of accuracy, resulting in poor consistency of the conductivity test results. When the opening size of the rubber gasket is B, the difference between the five conductivity test results is significantly reduced, and the test stability is significantly improved.

[0074] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0075] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0076] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0077] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0078] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0079] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A diaphragm conductivity testing fixture, characterized in that, The diaphragm conductivity testing fixture includes: A first liquid storage tank (10) and a second liquid storage tank (20). The first liquid storage tank (10) has a first liquid inlet (11) and a first conductive port (12) communicating with its inner cavity. The second liquid storage tank (20) has a second liquid inlet (21) and a second conductive port (22) communicating with its inner cavity. The first conductive port (12) and the second conductive port (22) are respectively provided. A first electrode (30) and a second electrode (40), wherein the first electrode (30) is disposed in the first liquid storage tank (10) and the second electrode (40) is disposed in the second liquid storage tank (20); A filling pad (50) is sandwiched between the side wall of the first liquid storage tank (10) where the first conductive port (12) is provided and the side wall of the second liquid storage tank (20) where the second conductive port (22) is provided. The filling pad (50) has a through-hole (51). The first conductive port (12) and the second conductive port (22) are connected through the through-hole (51). The area of ​​the first conductive port (12) and the area of ​​the second conductive port (22) are both larger than the area of ​​the through-hole (51). The projected area of ​​the first electrode (30) on the filling pad (50) and the projected area of ​​the second electrode (40) on the filling pad (50) are both larger than the area of ​​the through-hole (51).

2. The diaphragm conductivity testing fixture according to claim 1, characterized in that, The ratio between the projected area of ​​the first electrode (30) on the filling pad (50) and the area of ​​the connecting port (51) is between 10 and 20; and / or, The ratio between the projected area of ​​the second electrode (40) on the filling pad (50) and the area of ​​the connecting port (51) is between 10 and 20.

3. The diaphragm conductivity testing fixture according to claim 1, characterized in that, The filling pad (50) is a rubber pad.

4. The diaphragm conductivity testing fixture according to claim 1, characterized in that, The first electrode (30), the second electrode (40), the side wall of the first liquid storage tank (10) with the first conductive port (12) and the side wall of the second liquid storage tank (20) with the second conductive port (22) are all arranged in parallel.

5. The diaphragm conductivity testing fixture according to claim 1, characterized in that, The projected area of ​​the first electrode (30) on the filling pad (50) is equal to the projected area of ​​the second electrode (40) on the filling pad (50).

6. The diaphragm conductivity testing fixture according to claim 1, characterized in that, The diaphragm conductivity test fixture also includes connecting screws, and the first liquid storage tank (10), the filling pad (50) and the second liquid storage tank (20) are connected by the connecting screws.

7. The diaphragm conductivity testing fixture according to claim 1, characterized in that, The projected area of ​​the first electrode (30) on the filling pad (50) is less than or equal to the area of ​​the first conductive port (12); and / or, The projected area of ​​the second electrode (40) on the filling pad (50) is less than or equal to the area of ​​the second conductive port (22).

8. The diaphragm conductivity testing fixture according to claim 1, characterized in that, Both the first electrode (30) and the second electrode (40) are platinum sheets; and / or, The first conductive port (12), the second conductive port (22), and the connecting port (51) are all circular structures.

9. A method for testing the conductivity of a diaphragm, applied to the diaphragm conductivity testing fixture according to any one of claims 1 to 8, characterized in that, The method for testing the membrane conductivity includes: The filling pad (50) is sandwiched between the first liquid storage tank (10) and the second liquid storage tank (20); Electrolyte is filled into the first storage tank (10) and the second storage tank (20) respectively, and the first electrode (30) and the second electrode (40) are energized respectively to measure the first resistance R1; The diaphragm to be tested and the filling pad (50) are both sandwiched between the first liquid storage tank (10) and the second liquid storage tank (20), and the second resistance R2 is measured. The membrane conductivity is calculated based on the first resistor R1, the second resistor R2, the thickness L of the filling pad (50), and the area S of the connecting port (51).

10. The method for testing the conductivity of a diaphragm according to claim 9, characterized in that, After the step of calculating the membrane conductivity based on the first resistor R1 and the second resistor R2, the membrane conductivity testing method further includes: The first resistor R1 and the second resistor R2 were measured multiple times, and the membrane conductivity was calculated after each measurement. By comparing the membrane conductivity calculated after multiple measurements, it can be determined whether the membrane conductivity meets the accuracy requirements. If the membrane conductivity does not meet the accuracy requirements, repeat the following steps until the membrane conductivity meets the accuracy requirements: adjust the area of ​​the connecting port (51) of the filling pad (50), measure the first resistor R1 and the second resistor R2 multiple times, and calculate the membrane conductivity after each measurement to determine whether the membrane conductivity meets the accuracy requirements. If the membrane conductivity meets the accuracy requirements, the average value of the membrane conductivity obtained from multiple calculations shall be used as the membrane conductivity of the membrane to be tested.

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