Diaphragm conductivity testing device
By designing a membrane conductivity testing device, the problem of temperature variation affecting test results was solved, enabling accurate measurement of membrane conductivity at different temperatures, which is applicable to the field of flow batteries.
Patent Information
- Application Number
- CN202521006016.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-21
- Publication Date
- 2026-03-17
- Estimated Expiration
- 2035-05-21
AI Technical Summary
Existing technologies cannot accurately measure the conductivity of ion exchange membranes, especially under different temperature conditions, which causes the test results to deviate from the true value and cannot accurately characterize the conductivity of the membrane.
Design a membrane conductivity testing device, including two electrolytic cell substrates and a clamping plate to hold the membrane to be tested. The electrolytic cells are connected to the inlet and outlet pipelines to the solution temperature control chamber. Platinum electrodes and a compensating heating plate are set. The temperature is controlled by a circulating pump and a thermocouple to achieve accurate testing.
It enables accurate measurement of membrane conductivity at different temperatures, truly reflecting the electrochemical performance of the ion exchange membrane, and is applicable to flow battery systems of different types.
Smart Images
Figure CN224005186U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of ion membrane detection technology for flow batteries, and specifically relates to a membrane conductivity testing device. Background Technology
[0002] As a core component of flow batteries, ion-exchange membranes not only meet the dual requirements of high carrier conductivity (reducing ohmic losses) and high ion selectivity (preventing cross-contamination between positive and negative electrodes), but also facilitate carrier transfer to complete circuit cycles. Therefore, ion-exchange membranes play a crucial role in improving battery performance and reliability. Conductivity is paramount, directly determining the battery's internal ohmic resistance. Higher conductivity results in lower ion migration resistance, lower energy loss during charging and discharging, and higher voltage efficiency and energy conversion efficiency. Especially under high current density conditions, it can reduce polarization and enhance the battery's power output capability, which is critical for applications requiring rapid response (such as grid frequency regulation).
[0003] The accuracy of conductivity testing is paramount; inaccurate measurements will fail to reflect the true conductivity of membranes under different experimental or practical application scenarios. Temperature is a sensitive parameter in conductivity testing, with its value increasing exponentially with temperature. Temperature fluctuations can cause test results to deviate from the true value, failing to accurately characterize the membrane's inherent conductivity. Furthermore, temperature changes significantly affect the membrane's swelling behavior, leading to dynamic changes in its microstructure (such as ion channel size and water content), thus interfering with the objective evaluation of ion transport mechanisms. Therefore, there is a need to design a testing device to accurately simulate and test the electrochemical performance of ion exchange membranes under different practical application scenarios. Utility Model Content
[0004] This invention addresses the aforementioned problems and overcomes the shortcomings of existing technologies by providing a membrane conductivity testing device. The data obtained from this invention can accurately reflect the electrochemical performance of ion exchange membranes under different practical application scenarios.
[0005] To achieve the above objectives, the present invention adopts the following technical solution.
[0006] This utility model provides a membrane conductivity testing device, characterized in that it includes two identical electrolytic cell substrates, which are clamped together by clamps on both sides and hold the membrane to be tested in the middle. Each of the two electrolytic cells has an electrolytic cell in its center. The membrane is connected to the interior of each of the two electrolytic cells on both sides. Each electrolytic cell substrate is connected to an inlet pipe and an outlet pipe, both of which are connected to a solution temperature control chamber containing the test system solution. A compensating heating plate is provided on the side wall of each electrolytic cell. Platinum electrodes are provided on both electrolytic cell substrates, and both platinum electrodes are connected to the interior of the electrolytic cells. Both platinum electrodes are connected to an outlet electrode for connection to an external power source.
[0007] Furthermore, a circulation pump is installed on the liquid inlet pipeline.
[0008] Furthermore, an inlet valve is provided on the inlet pipe, and an outlet valve is provided on the outlet pipe.
[0009] Furthermore, thermocouples are provided on both the solution temperature control chamber and the electrolytic cell substrate. The thermocouples on the solution temperature control chamber are used to measure the temperature of the test system solution inside the solution temperature control chamber, and the thermocouples on the electrolytic cell substrate are used to measure the temperature of the test system solution entering the electrolytic cell.
[0010] Furthermore, the test system solution is a sulfuric acid solution, a hydrochloric acid solution, or an aqueous solution.
[0011] Furthermore, the membrane to be tested is a non-fluorine ion membrane, a fluoride ion membrane, or a perfluorine ion membrane.
[0012] Furthermore, the compensating heating plate is an electric heating wire heating plate, an electric heating film heating plate, an electromagnetic induction heating plate, or an infrared heating plate.
[0013] The beneficial effects of this utility model.
[0014] This invention controls the temperature of the test system solution during the testing process to test the conductivity of the membrane under different systems and temperatures. The test data can truly reflect the electrochemical performance of the ion-exchange membrane under different practical application scenarios. The test ion-exchange membrane rate is accurate and suitable for the performance requirements of membranes in different flow battery systems. Attached Figure Description
[0015] To make the technical problems solved, the technical solutions, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.
[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model.
[0017] In the diagram, the following are the markings: 1 is the electrolytic cell substrate, 2 is the clamping plate, 3 is the diaphragm to be tested, 4 is the electrolytic cell, 5 is the inlet pipe, 6 is the outlet pipe, 7 is the test system solution, 8 is the solution temperature control chamber, 9 is the compensating heating plate, 10 is the platinum electrode, 11 is the outlet electrode, 12 is the circulation pump, 13 is the inlet valve, 14 is the outlet valve, and 15 is the thermocouple. Detailed Implementation
[0018] As shown in the accompanying drawings, this embodiment provides a membrane conductivity testing device, including two electrolytic cell substrates 1 with identical structures. The two electrolytic cell substrates 1 are clamped together by clamping plates 2 on both sides and the membrane 3 to be tested is held in the middle. The membrane 3 to be tested can be a non-fluorine ion membrane, a polyfluorine ion membrane, or a perfluorine ion membrane.
[0019] Both electrolytic cells 1 have an electrolytic cell 4 in the middle. Before the diaphragm is installed, the two electrolytic cells 4 are connected. When the diaphragm is clamped, the two sides of the diaphragm are connected to the inside of the two electrolytic cells 4 respectively, so that the diaphragm can be immersed in the test system solution 7 that enters the electrolytic cells 4.
[0020] Each electrolytic cell substrate 1 is connected to an inlet pipe 5 and an outlet pipe 6, which are both connected to a solution temperature control chamber 8 containing the test system solution 7. The test system solution 7 can be a sulfuric acid solution, hydrochloric acid solution, or aqueous solution. A thermocouple 15 is installed on the solution temperature control chamber 8 to measure the temperature of the test system solution 7 inside the solution temperature control chamber 8. The heating and temperature control methods of the solution temperature control chamber 8 are embedded resistance wire thermal radiation, hot air circulation, water bath, or oil bath.
[0021] A circulation pump 12 is installed on the inlet pipe 5 to introduce the test system solution 7 from the solution temperature control chamber 8 into the electrolytic cell 4. An inlet valve 13 is installed on the inlet pipe 5, and an outlet valve 14 is installed on the outlet pipe 6. After the test system solution 7 has been introduced into the electrolytic cell 4 and filled, the inlet valve 13 and the outlet valve 14 are closed to conduct tests under stable conditions.
[0022] A compensating heating plate 9 is provided on the side wall of the electrolytic cell 4. The compensating heating plate 9 is an electric heating wire heating plate, an electric heating film heating plate, an electromagnetic induction heating plate, or an infrared heating plate. The temperature of the test system solution 7 in the electrolytic cell 4 is controlled by the compensating heating plate 9.
[0023] A thermocouple 15 is installed on the electrolytic cell substrate 1 to measure the temperature of the test system solution 7 entering the electrolytic cell 4.
[0024] Platinum electrodes 10 are provided on both electrolytic cell substrates 1. Both platinum electrodes 10 are connected to the inside of the electrolytic cell 4. Both platinum electrodes 10 are connected to an output electrode 11 for connecting to an external power source.
[0025] The following four examples illustrate the selection of test methods and test parameters:
[0026] Example 1
[0027] A 50-micrometer-thick membrane 3 to be tested is cut to a certain size and immersed in a 3.0 mol / L sulfuric acid solution. The test system solution 7 is poured into a solution temperature control chamber 8 and kept at a temperature of 25°C. Then, the constant-temperature test solution is introduced into the electrolytic cell 4 through a circulation pump 12. After introduction, the inlet valve 13 and outlet valve 14 are closed, and the compensating heating plate 9 is turned on for temperature control. The electrolytic cell substrate 1 is equipped with a platinum electrode 10. The common impedance of the two electrolytic cell substrates 1 is measured using an electrochemical workstation, which is the overall blank resistance of the two electrolytic cell substrates 1. Then, the two electrolytic cell substrates 1 are clamped together with the immersed membrane 3 using a clamping plate 2. The common impedance of the two electrolytic cell substrates 1 with the membrane 3 installed is measured, and the conductivity of the ion-exchange membrane is obtained by conventional calculation methods in this field.
[0028] Example 2
[0029] A 50-micrometer-thick membrane 3 to be tested is cut to a certain size and immersed in a 3.0 mol / L sulfuric acid solution. The test system solution 7 is poured into a solution temperature control chamber 8 and kept at 65°C. Then, the constant-temperature test solution is introduced into the electrolytic cell 4 through a circulation pump 12. After introduction, the inlet valve 13 and outlet valve 14 are closed, and the compensating heating plate 9 is turned on for temperature control. The electrolytic cell substrate 1 is equipped with a platinum electrode 10. The common impedance of the two electrolytic cell substrates 1 is measured using an electrochemical workstation, which is the overall blank resistance of the two electrolytic cell substrates 1. Then, the two electrolytic cell substrates 1 are clamped together with the immersed membrane 3 using a clamping plate 2. The common impedance of the two electrolytic cell substrates 1 with the membrane 3 installed is measured, and the conductivity of the ion-exchange membrane is obtained by conventional calculation methods in this field.
[0030] Example 3
[0031] A 70-micrometer-thick membrane 3 to be tested was cut to a certain size and immersed in a 3.0 mol / L hydrochloric acid solution. The test system solution 7 was poured into a solution temperature control chamber 8 and kept at a temperature of 65°C. Then, the constant-temperature test solution was introduced into the electrolytic cell 4 through a circulation pump 12. After introduction, the inlet valve 13 and outlet valve 14 were closed, and the compensating heating plate 9 was turned on for temperature control. The electrolytic cell substrate 1 was equipped with a platinum electrode 10. The common impedance of the two electrolytic cell substrates 1 was measured using an electrochemical workstation, which is the overall blank resistance of the two electrolytic cell substrates 1. Then, the two electrolytic cell substrates 1 were clamped together with the immersed membrane 3 using a clamping plate 2. The common impedance of the two electrolytic cell substrates 1 with the membrane 3 installed was measured, and the conductivity of the ion-exchange membrane was obtained using conventional calculation methods in this field.
[0032] Example 4
[0033] A 120-micron-thickness membrane 3 to be tested is cut to a certain size and immersed in a test aqueous solution. The test system solution 7 is poured into a solution temperature control chamber 8 and kept at 85°C. Then, the constant-temperature test solution is introduced into the electrolytic cell 4 through a circulation pump 12. After introduction, the inlet valve 13 and outlet valve 14 are closed, and the compensating heating plate 9 is turned on for temperature control. The electrolytic cell substrate 1 is equipped with a platinum electrode 10. The common impedance of the two electrolytic cell substrates 1 is measured using an electrochemical workstation, which is the overall blank resistance of the two electrolytic cell substrates 1. Then, the two electrolytic cell substrates 1 are clamped together with the immersed membrane 3 using a clamping plate 2. The common impedance of the two electrolytic cell substrates 1 with the membrane 3 installed is measured, and the conductivity of the ion-exchange membrane is obtained using conventional calculation methods in this field.
[0034] It is understood that the above specific description of this utility model is only used to illustrate this utility model and is not limited to the technical solutions described in the embodiments of this utility model. Those skilled in the art should understand that modifications or equivalent substitutions can still be made to this utility model to achieve the same technical effect; as long as the use needs are met, they are all within the protection scope of this utility model.
Claims
1. A diaphragm conductivity test device, characterized by, The application relates to a kind of electrolytic cell base bodies (1) comprising two identical structures, two electrolytic cell base bodies (1) are clamped by two side clamps (2) and the middle clamping membrane (3) to be measured, two electrolytic cell base bodies (1) are provided with electrolytic cell (4) in the middle, the membrane is respectively communicated with the inside of two electrolytic cell (4) on both sides, electrolytic cell base body (1) is respectively connected with liquid inlet pipeline (5) and liquid outlet pipeline (6), liquid inlet pipeline (5) and liquid outlet pipeline (6) are connected to solution temperature control box (8) containing test system solution (7), compensation heating plate (9) is provided on the side wall of electrolytic cell (4), two platinum electrodes (10) are provided on electrolytic cell base body (1), two platinum electrodes (10) are communicated with the inside of electrolytic cell (4), two platinum electrodes (10) are connected with electrode (11) for connecting with external power supply.
2. A diaphragm conductivity test device according to claim 1, wherein, Circulating pump (12) is provided on the liquid inlet pipeline (5).
3. The diaphragm conductivity testing device of claim 1, wherein, Liquid inlet valve (13) is provided on the liquid inlet pipeline (5), and liquid outlet valve (14) is provided on the liquid outlet pipeline (6).
4. The diaphragm conductivity testing device of claim 1, wherein, Thermocouple (15) is provided on the solution temperature control box (8) and electrolytic cell base body (1), the thermocouple (15) of solution temperature control box (8) is used to measure the temperature of test system solution (7) in solution temperature control box (8), and the thermocouple (15) of electrolytic cell base body (1) is used to measure the temperature of test system solution (7) entering electrolytic cell (4).
5. The diaphragm conductivity testing device of claim 1, wherein, The test system solution (7) is sulfuric acid solution, hydrochloric acid solution or aqueous solution.
6. The diaphragm conductivity testing device of claim 1, wherein, The membrane to be measured (3) is non-fluoride ion membrane, partial fluorine ion membrane or full fluorine ion membrane.
7. The diaphragm conductivity testing device of claim 1, wherein, The compensation heating plate (9) is electric heating wire heating plate, electric heating film heating plate, electromagnetic induction heating plate or infrared heating plate.