Electrolytic cell performance testing system

Abstract

The application discloses an electrolytic cell performance test system, which comprises an electrolytic cell, an electronic load, a direct current power supply and a first contactor to a fifth contactor. The anode of the electrolytic cell is connected with the positive pole of the direct current power supply and one end of the fourth contactor. The negative pole of the direct current power supply is connected with one end of the first contactor and one end of the third contactor. The other end of the first contactor is connected with the cathode of the electrolytic cell, one end of the second contactor and one end of the fifth contactor. The other end of the second contactor and the other end of the fourth contactor are connected with the positive pole of the electronic load. The negative pole of the electronic load is connected with the other end of the third contactor and the other end of the fifth contactor. The application has the advantages that the accelerated stress test requirement is met, and the power supply interference in EIS test can be eliminated.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electrolytic cell performance testing, in particular to an electrolytic cell performance testing system. BACKGROUND

[0002] In the current critical period of global energy transformation, hydrogen energy, as a highly potential clean energy, is gradually becoming the focus of attention in the academic and industrial circles. With the increasing depletion of traditional fossil fuels and the increasing severity of environmental problems, it is urgent to find a sustainable and efficient energy alternative. Hydrogen energy has shown great application prospects due to its high energy density, renewability, and environmental-friendly characteristics of its combustion product being only water. The water electrolysis hydrogen production technology is gradually becoming one of the key technologies to achieve the carbon neutralization goal due to its multiple advantages.

[0003] PEM water electrolysis hydrogen production technology has significant advantages in high-purity hydrogen production, fast response, high electrolysis efficiency, compact structure, and environmental friendliness, making it have broad application prospects in the field of renewable energy hydrogen production. PEM water electrolysis hydrogen production technology is expected to play an important role in future energy systems. Therefore, electrical performance, electrochemical characteristics, and accelerated life are the main test methods for studying PEM electrolytic cells.

[0004] Chinese Patent Publication No. CN116046849A discloses an electrolytic cell impedance spectrum test system for electrolytic cell hydrogen production and its application. The system performs EIS test on the electrolytic cell by connecting the power supply in series with the electronic load, which can eliminate the interference of the power supply and obtain the EIS graph only reflecting the impedance of the electrolytic cell. However, the existing electrolytic cell test system only focuses on performance testing, and there is power supply interference in the fast charging and discharging technology and EIS test, which cannot meet the test requirements. Specifically, the following problems exist:

[0005] On the one hand, the direct current power supply supplies power to the electrolytic cell, and after being disconnected, the electrolytic cell cannot be discharged quickly, and the voltage below 1.4V is released slowly, which cannot meet the accelerated stress test mentioned in the European Union JRC standard.

[0006] On the other hand, in the EIS test process, the direct current power supply is connected in parallel with the electrolytic cell to supply power to the electrolytic cell, and the electrochemical workstation is connected in parallel with the electrolytic cell to perform EIS test. However, since both are connected in parallel with the electrolytic cell, the impedance measured in the EIS test process is not only the resistance of the electrolytic cell, but also the partial resistance of the power supply, which leads to the problem that the interference of the power supply in the EIS test cannot be eliminated, and the measured impedance of the electrolytic cell is not real. SUMMARY

[0007] The technical problem to be solved by the present application is that the existing electrolytic cell test system does not meet the accelerated stress test requirements and cannot eliminate the power supply interference in the EIS test.

[0008] This invention solves the above-mentioned technical problems through the following technical means: an electrolytic cell performance testing system, comprising an electrolytic cell, an electronic load, a DC power supply, and first to fifth contactors. The anode of the electrolytic cell is connected to the positive terminal of the DC power supply and one end of the fourth contactor. The negative terminal of the DC power supply is connected to one end of the first and third contactors. The other end of the first contactor is connected to the cathode of the electrolytic cell, one end of the second contactor, and one end of the fifth contactor. The other ends of the second and fourth contactors are both connected to the positive terminal of the electronic load. The negative terminal of the electronic load is connected to the other ends of the third and fifth contactors. The testing method of the testing system is as follows: by controlling the opening and closing of the first to fifth contactors, the electronic load is connected in series with the electrolytic cell and then connected in parallel with the DC power supply, thereby eliminating DC power supply interference in the EIS test; simultaneously, the first to fifth contactors are engaged to achieve stress testing of the electrolytic cell.

[0009] Beneficial effects: This invention controls the opening and closing of the first to fifth contactors, so that the electronic load is connected in series with the electrolytic cell and then connected in parallel with the DC power supply, thereby eliminating DC power supply interference in EIS testing; at the same time, the first to fifth contactors are closed to realize stress testing of the electrolytic cell, so that the overall scheme meets the requirements of accelerated stress testing and can eliminate power supply interference in EIS testing.

[0010] Furthermore, the testing method of the testing system also includes: controlling the opening and closing of the first to fifth contactors to connect the DC power supply in parallel with the electrolytic cell, thereby enabling the DC power supply to independently load the electrolytic cell.

[0011] Furthermore, by controlling the opening and closing of the first to fifth contactors, the DC power supply is connected in parallel with the electrolytic cell, enabling the DC power supply to independently load the electrolytic cell, including:

[0012] Engage the first contactor and disconnect the second to fifth contactors to directly connect the DC power supply in parallel with the electrolytic cell, thereby enabling the DC power supply to load the electrolytic cell for polarization and durability performance testing.

[0013] Furthermore, by controlling the opening and closing of the first to fifth contactors, the electronic load is connected in series with the electrolytic cell and then the whole system is connected in parallel with the DC power supply, thereby eliminating DC power supply interference during EIS testing, including:

[0014] The second and third contactors are engaged, while the first, fourth, and fifth contactors are disengaged. A constant voltage mode is applied to the DC power supply, and a constant current mode is applied to the electronic load. Electrolysis is initiated in the electrolytic cell, and the electrochemical workstation is connected in parallel with the electrolytic cell to perform EIS testing.

[0015] Furthermore, simultaneously engaging the first to fifth contactors enables stress testing of the electrolytic cell, including:

[0016] The process involves engaging the first contactor, disengaging the second through fifth contactors, and simultaneously applying a first preset voltage to the electrolytic cell using a DC power supply. After a first preset time of constant voltage load on the electrolytic cell, the DC power supply is turned off, and the first contactor is engaged again. Subsequently, the fourth and fifth contactors are engaged, while the second and third contactors are disengaged. The electronic load is then applied at a constant current, and the electrolytic cell is depleted to below the second preset voltage. After this process, the electronic load is turned off, and the fourth and fifth contactors are disengaged. After a second preset time, the first contactor is engaged again, and the first preset voltage is applied to the electrolytic cell using a DC power supply. This process is repeated to complete the charging and discharging of the electrolytic cell, thus achieving square wave stress testing.

[0017] Furthermore, the first preset voltage ranges from 1.4V to 1.5V.

[0018] Furthermore, the value range of the first preset time is 10s to 15s.

[0019] Furthermore, the second preset voltage ranges from 0 to 0.1V.

[0020] Furthermore, the second preset time ranges from 3 to 5 seconds.

[0021] Furthermore, the first preset voltage is greater than the second preset voltage.

[0022] The advantages of this invention are:

[0023] (1) The present invention controls the opening and closing of the first to the fifth contactors so that the electronic load is connected in series with the electrolytic cell and then connected in parallel with the DC power supply, thereby eliminating DC power supply interference in EIS testing; at the same time, the first to the fifth contactors are closed to realize the stress test of the electrolytic cell, so that the overall scheme meets the requirements of accelerated stress test and can eliminate power supply interference in EIS testing.

[0024] (2) This invention proposes a test system that simultaneously satisfies DC electrolysis of electrolytic cells, rapid charging and discharging, and power supply interference elimination in EIS. Through contactor point connection, the electrolytic cell, DC power supply, and electronic load can be connected in parallel, individually in parallel, and in series. This satisfies the normal load of DC power supply on electrolytic cells, eliminates power supply interference during impedance testing of electrolytic cells, and also satisfies accelerated stress testing, enabling square wave stress testing with rapid charging and discharging between 1.5V and 0V.

[0025] (3) Based on the series electronic load, this invention enables rapid charge-discharge testing and accelerated stress testing of the electrolytic cell by directly connecting the electronic load in parallel to the electrolytic cell. Furthermore, by forming different circuits with the DC power supply, electrolytic cell, and electronic load through contactors, it is possible to achieve testing of more functions of the electrolytic cell and meet the testing requirements of the electrolytic cell. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of an electrolytic cell performance testing system disclosed in an embodiment of the present invention;

[0027] Figure 2 This is a comparison curve of power supply interference elimination in the EIS test of an electrolytic cell performance testing system disclosed in an embodiment of the present invention;

[0028] Figure 3 This is a schematic diagram of the square wave stress test results of an electrolytic cell performance testing system disclosed in an embodiment of the present invention. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. 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.

[0030] like Figure 1 As shown, the present invention provides an electrolytic cell performance testing system, including an electrolytic cell 1, an electronic load 2, a DC power supply 3, and first contactors 4 to fifth contactors 8. The anode of the electrolytic cell 1 is connected to the positive terminal of the DC power supply 3 and one end of the fourth contactor 7. The negative terminal of the DC power supply 3 is connected to one end of the first contactor 4 and the third contactor 6, respectively. The other end of the first contactor 4 is connected to the cathode of the electrolytic cell 1, one end of the second contactor 5, and one end of the fifth contactor 8, respectively. The other ends of the second contactor 5 and the fourth contactor 7 are both connected to the positive terminal of the electronic load 2. The negative terminal of the electronic load 2 is connected to the other ends of the third contactor 6 and the fifth contactor 8.

[0031] The testing methods of the electrolytic cell 1 testing system provided by this invention include, but are not limited to, the following:

[0032] (1) The DC power supply 3 can independently load the electrolytic cell 1. It can engage the first contactor 4, disconnect the second contactor 5, the third contactor 6, the fourth contactor 7, and the fifth contactor 8, and connect the DC power supply 3 directly in parallel with the electrolytic cell 1. This enables the DC power supply 3 to load the electrolytic cell 1 for polarization, durability and other performance tests.

[0033] (2) During EIS testing of electrolytic cell 1, the interference from DC power supply 3 is eliminated by engaging the second contactor 5 and the third contactor 6, and disengaging the first contactor 4, the fourth contactor 7, and the fifth contactor 8. DC power supply 3 applies a constant voltage mode, and electronic load 2 applies a constant current mode, allowing electrolytic cell 1 to be electrolyzed. Simultaneously, the electrochemical workstation is connected in parallel with electrolytic cell 1 for EIS testing, thus eliminating power supply interference. Figure 2 As shown. From Figure 2 It is evident that connecting the electronic load 2 in series can significantly eliminate the interference from the power supply in the EIS test.

[0034] (3) The electrolytic cell 1 is rapidly charged and discharged to achieve the function of accelerated stress testing. The first contactor 4 is engaged, and the second contactor 5, the third contactor 6, the fourth contactor 7, and the fifth contactor 8 are disengaged. At the same time, the DC power supply 3 applies 1.5V to the electrolytic cell 1 to perform constant voltage load on the electrolytic cell 1 for a certain period of time (10-15s). After that, the DC power supply 3 is turned off, and the first contactor 4 is engaged. Subsequently, the fourth contactor 7 and the fifth contactor 8 are engaged, and the second contactor 5 and the third contactor 6 are disengaged. The electronic load 2 then performs constant current load. After rapidly depleting the voltage of electrolytic cell 1 to below 0.1V, the electronic load 2 is turned off, and the fourth contactor 7 and the fifth contactor 8 are disconnected. After running for a specified time (3-5 seconds), the first contactor 4 is engaged, and DC power supply 3 applies 1.5V to electrolytic cell 1. Repeating these steps completes the rapid charging and discharging of electrolytic cell 1, achieving square wave stress testing. Therefore, by alternating the operation of electronic load 2 and DC power supply 3, in conjunction with the output of the square wave stress test script, conditions for accelerating durability testing can be achieved. Figure 3 As shown. Its principle lies in the rechargeable and discharging characteristics of the electrolytic cell 1. By using the power supply and electronic load 2 to alternately charge and discharge the electrolytic cell 1 rapidly, the electrolytic cell 1 can quickly switch between 1.5V and 0V, thereby accelerating the testing process.

[0035] Through the above technical solutions, this invention connects the electrolytic cell 1, DC power supply 3, and electronic load 2 via contactor points, allowing them to be connected in parallel, individually in parallel, and also in series. This satisfies the requirement of the DC power supply 3 for normal electrolysis of the electrolytic cell 1, eliminates power supply interference during impedance testing of the electrolytic cell 1, and also meets the requirements for accelerated stress testing, enabling square wave stress testing with rapid charging and discharging between 1.5V and 0V, thus achieving the accelerated stress testing mentioned in the EU JRC standard. This provides solid data support for the later industrialization of the electrolytic cell 1 by verifying its performance in multiple aspects.

[0036] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An electrolytic cell performance testing system, characterized in that, The system includes an electrolytic cell, an electronic load, a DC power supply, and first to fifth contactors. The anode of the electrolytic cell is connected to the positive terminal of the DC power supply and one end of the fourth contactor. The negative terminal of the DC power supply is connected to one end of the first and third contactors. The other end of the first contactor is connected to the cathode of the electrolytic cell, one end of the second contactor, and one end of the fifth contactor. The other ends of the second and fourth contactors are both connected to the positive terminal of the electronic load. The negative terminal of the electronic load is connected to the other ends of the third and fifth contactors. The testing method of the system is as follows: by controlling the opening and closing of the first to fifth contactors, the electronic load is connected in series with the electrolytic cell and then in parallel with the DC power supply, thereby eliminating DC power supply interference in the EIS test. At the same time, the first to fifth contactors are engaged to achieve stress testing of the electrolytic cell. The simultaneous engagement of the first to fifth contactors to achieve stress testing of the electrolytic cell includes: The process involves engaging the first contactor, disengaging the second through fifth contactors, and simultaneously applying a first preset voltage to the electrolytic cell using a DC power supply. After a first preset time of constant voltage load on the electrolytic cell, the DC power supply is turned off, and the first contactor is engaged again. Subsequently, the fourth and fifth contactors are engaged, while the second and third contactors are disengaged. The electronic load is then applied at a constant current, and the electrolytic cell is depleted to below the second preset voltage. After this process, the electronic load is turned off, and the fourth and fifth contactors are disengaged. After a second preset time, the first contactor is engaged again, and the first preset voltage is applied to the electrolytic cell using a DC power supply. This process is repeated to complete the charging and discharging of the electrolytic cell, thus achieving square wave stress testing.

2. The electrolytic cell performance testing system according to claim 1, characterized in that, The testing method of the testing system also includes: controlling the opening and closing of the first to fifth contactors to connect the DC power supply in parallel with the electrolytic cell, so as to enable the DC power supply to independently load the electrolytic cell.

3. The electrolytic cell performance testing system according to claim 2, characterized in that, By controlling the opening and closing of the first to fifth contactors, the DC power supply is connected in parallel with the electrolytic cell, enabling the DC power supply to independently load the electrolytic cell, including: Engage the first contactor and disconnect the second to fifth contactors to directly connect the DC power supply in parallel with the electrolytic cell, thereby enabling the DC power supply to load the electrolytic cell for polarization and durability performance testing.

4. The electrolytic cell performance testing system according to claim 1, characterized in that, By controlling the opening and closing of the first to fifth contactors, the electronic load is connected in series with the electrolytic cell and then the whole system is connected in parallel with the DC power supply, thereby eliminating DC power supply interference during EIS testing, including: The second and third contactors are engaged, while the first, fourth, and fifth contactors are disengaged. A constant voltage mode is applied to the DC power supply, and a constant current mode is applied to the electronic load. Electrolysis is initiated in the electrolytic cell, and the electrochemical workstation is connected in parallel with the electrolytic cell to perform EIS testing.

5. The electrolytic cell performance testing system according to claim 1, characterized in that, The first preset voltage ranges from 1.4V to 1.5V.

6. The electrolytic cell performance testing system according to claim 1, characterized in that, The first preset time ranges from 10s to 15s.

7. The electrolytic cell performance testing system according to claim 1, characterized in that, The second preset voltage ranges from 0 to 0.1V.

8. The electrolytic cell performance testing system according to claim 1, characterized in that, The second preset time ranges from 3 to 5 seconds.

9. The electrolytic cell performance testing system according to claim 1, characterized in that, The first preset voltage is greater than the second preset voltage.

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