Electrolytic bath performance test system

Abstract

The invention discloses an electrolytic bath performance test system, which comprises an electrolytic bath, an electronic load, a direct current power supply, a first contactor, a second contactor, a third contactor, a fourth contactor, a fifth contactor, a third contactor, a fourth contactor and a fifth contactor, the other end of the first contactor is connected with the cathode of the electrolytic bath, 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 anode of the electronic load, and the cathode of the electronic load is connected with the other end of the third contactor and the other end of the fifth contactor; the method has the advantages that the acceleration stress test requirement is met, and the power supply interference in the EIS test can be eliminated.

Description

Technical Field

[0001] The invention relates to the field of electrolytic cell performance testing, and in particular to an electrolytic cell performance testing system. Background Art

[0002] At this critical time of global energy transformation, hydrogen energy, as a clean energy with great potential, is gradually becoming the focus of academic and industrial attention. With the increasing depletion of traditional fossil fuels and increasingly severe environmental problems, it is imperative to find sustainable and efficient energy alternatives. Hydrogen energy has great application prospects due to its high energy density, renewability and environmentally friendly characteristics that the only combustion product is water. The technology of producing hydrogen by electrolysis of water is gradually becoming one of the key technologies to achieve the goal of carbon neutrality due to its many advantages.

[0003] PEM water electrolysis hydrogen production technology has significant advantages in high-purity hydrogen production, rapid 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 occupy an important position in the future energy system. Therefore, electrical performance, electrochemical characteristics, and accelerated life have become the main test methods for studying PEM electrolyzers.

[0004] Chinese patent publication number CN116046849A discloses an electrolytic cell impedance spectrum test system and its application for hydrogen production by electrolyzer. By connecting an electronic load in series with a power supply to perform an EIS test on the electrolyzer, the interference of the power supply can be eliminated, and an EIS graph that only feeds back the impedance of the electrolyzer can be obtained. However, the above-mentioned existing electrolyzer 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, there are the following problems:

[0005] On the one hand, the DC power supply supplies power to the electrolytic cell. After it is disconnected, the electrolytic cell cannot discharge quickly, and the voltage below 1.4V is released slowly, which cannot meet the accelerated stress test mentioned in the EU JRC standard.

[0006] On the other hand, during the EIS test, a DC power supply is connected in parallel to the electrolytic cell to power the electrolytic cell, and the electrochemical workstation is connected in parallel to the electrolytic cell for EIS testing. However, since both are connected in parallel to the electrolytic cell, during the EIS test, the impedance measured is not just the resistance of the feedback electrolytic cell, but also includes partial resistance of the power supply. This makes it impossible to eliminate the interference problem caused by the power supply to the EIS test, and the measured impedance of the electrolytic cell is not real. Summary of the invention

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

[0008] The present invention solves the above technical problems through the following technical means: an electrolytic cell performance test system comprises an electrolytic cell, an electronic load, a direct current power supply and first to fifth contactors, wherein the anode of the electrolytic cell is connected to the positive electrode of the direct current power supply and one end of the fourth contactor, the negative electrode of the direct current power supply is respectively connected to one end of the first contactor and one end of the third contactor, the other end of the first contactor is respectively connected to 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 both connected to the positive electrode of the electronic load, and the negative electrode of the electronic load is connected to the other end of the third contactor and the other end of the fifth contactor; the testing method of the testing system is: through the opening and closing control of the first to fifth contactors, the electronic load is connected in series with the electrolytic cell and then connected in parallel with the direct current power supply as a whole, so as to eliminate the interference of the direct current power supply in the EIS test; and the first to fifth contactors are simultaneously attracted to realize the stress test of the electrolytic cell.

[0009] Beneficial effect: The present invention controls the opening and closing of the first contactor to the fifth contactor, so that the electronic load is connected in series with the electrolytic cell and then connected in parallel with the DC power supply as a whole, thereby eliminating DC power supply interference in the EIS test; at the same time, the first contactor to the fifth contactor are attracted to realize the stress test of the electrolytic cell, so that the overall solution meets the requirements of accelerated stress testing and can eliminate power supply interference in the EIS test.

[0010] Furthermore, the testing method of the testing system also includes: by opening and closing control of the first contactor to the fifth contactor, the DC power supply is connected in parallel with the electrolytic cell, so that the DC power supply alone loads the electrolytic cell.

[0011] Furthermore, the DC power supply is connected in parallel with the electrolytic cell by opening and closing the first contactor to the fifth contactor, so that the DC power supply alone loads the electrolytic cell, including:

[0012] The first contactor is pulled in, and the second to fifth contactors are disconnected, and the DC power supply is directly connected in parallel with the electrolytic cell to realize the DC power supply loading the electrolytic cell and conduct polarization and durability performance tests.

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

[0014] The second contactor and the third contactor are attracted, and the first contactor, the fourth contactor and the fifth contactor are disconnected. The DC power supply applies a constant voltage mode, and the electronic load applies a constant current mode. The electrolytic cell is loaded for electrolysis. At the same time, the electrochemical workstation is connected in parallel with the electrolytic cell to perform an EIS test.

[0015] Furthermore, the first contactor to the fifth contactor are simultaneously attracted to implement stress testing of the electrolytic cell, including:

[0016] The first contactor is attracted, and the second to fifth contactors are disconnected. At the same time, a DC power supply is used to apply a first preset voltage to the electrolytic cell. After the electrolytic cell is loaded with a constant voltage for a first preset time, the DC power supply is turned off and the first contactor is attracted at the same time. Subsequently, the fourth and fifth contactors are attracted, and the second and third contactors are disconnected. The electronic load is loaded with a constant current, and after the electrolytic cell is consumed to below the second preset voltage, the electronic load is turned off and the fourth and fifth contactors are disconnected. After running for a second preset time, the first contactor is attracted and a DC power supply is used to apply a first preset voltage to the electrolytic cell. The above steps are repeated to complete the charging and discharging of the electrolytic cell and realize the square wave stress test.

[0017] Furthermore, the first preset voltage has a value range of 1.4V to 1.5V.

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

[0019] Furthermore, the second preset voltage has a value range of 0 to 0.1V.

[0020] Furthermore, the second preset time has a value range of 3 to 5 seconds.

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

[0022] The advantages of the present invention are:

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

[0024] (2) The present invention proposes a test system that can simultaneously meet the requirements of direct current electrolysis, rapid charging and discharging of an electrolytic cell, and elimination of power supply interference during EIS. Through contactor point connection, the electrolytic cell, direct current power supply, and electronic load can be connected in parallel, individually in parallel, or in series. This can not only meet the requirements of normal electrolysis of the electrolytic cell by the direct current power supply, but also eliminate the interference of the power supply during the impedance test of the electrolytic cell. At the same time, it can also meet the requirements of accelerated stress testing, and can perform square wave stress testing for rapid charging and discharging between 1.5V and 0V.

[0025] (3) Based on the series connection of the electronic load, the present invention can complete the rapid charge and discharge test of the electrolytic cell and the accelerated stress test by directly connecting the electronic load in parallel to the electrolytic cell. In addition, the DC power supply, the electrolytic cell, and the electronic load are formed into different circuits through the contactor, which can take into account the testing of more functions of the electrolytic cell and meet the testing requirements of the electrolytic cell. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0027] Figure 2 A comparison curve of eliminating power supply interference in an EIS test of an electrolytic cell performance test system disclosed in an embodiment of the present invention;

[0028] Figure 3 A schematic diagram of square wave stress test results of an electrolytic cell performance test system disclosed in an embodiment of the present invention. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work 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, comprising an electrolytic cell 1, an electronic load 2, a DC power supply 3, and first to fifth contactors 4 to 8, wherein the anode of the electrolytic cell 1 is connected to the positive electrode of the DC power supply 3 and one end of the fourth contactor 7, the negative electrode of the DC power supply 3 is respectively connected to one end of the first contactor 4 and the third contactor 6, the other end of the first contactor 4 is respectively connected to the cathode of the electrolytic cell 1, one end of the second contactor 5, and one end of the fifth contactor 8, the other end of the second contactor 5 and the other end of the fourth contactor 7 are both connected to the positive electrode of the electronic load 2, and the negative electrode of the electronic load 2 is connected to the other end of the third contactor 6 and the other end of the fifth contactor 8.

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

[0032] (1) The DC power supply 3 independently loads the electrolytic cell 1, closes the first contactor 4, disconnects the second contactor 5, the third contactor 6, the fourth contactor 7, and the fifth contactor 8, and directly connects the DC power supply 3 to the electrolytic cell 1 in parallel, so that the DC power supply 3 can load the electrolytic cell 1 to perform polarization, durability and other performance tests.

[0033] (2) Eliminate the interference of DC power supply 3 during EIS test of electrolytic cell 1. Close the second contactor 5 and the third contactor 6, disconnect the first contactor 4, the fourth contactor 7, and the fifth contactor 8. Apply constant voltage mode to DC power supply 3 and constant current mode to electronic load 2. Electrolysis can be carried out by loading electrolytic cell 1. At the same time, the electrochemical workstation is connected in parallel with electrolytic cell 1 to perform EIS test, which can eliminate the interference of power supply. Figure 2 As shown. Figure 2 It can be clearly seen that the series connection of electronic load 2 can significantly eliminate the interference of the power supply in the EIS test.

[0034] (3) The electrolytic cell 1 is charged and discharged quickly to realize the accelerated stress test function. The first contactor 4 is attracted, and the second contactor 5, the third contactor 6, the fourth contactor 7, and the fifth contactor 8 are disconnected. At the same time, a DC power supply 3 is used to apply 1.5V to the electrolytic cell 1 to load the electrolytic cell 1 at a constant voltage for a certain period of time (10 to 15 seconds). Then, the DC power supply 3 is turned off, and the first contactor 4 is attracted at the same time. Subsequently, the fourth contactor 7 and the fifth contactor 8 are attracted, and the second contactor 5 and the third contactor 6 are disconnected. The electronic load 2 is pulled at a constant current. After the electronic load 2 is turned off and the fourth contactor 7 and the fifth contactor 8 are disconnected and run for a specified time (3 to 5 seconds), the first contactor 4 is pulled in and the DC power supply 3 is used to apply 1.5V to the electrolytic cell 1. The above steps are repeated to complete the rapid charge and discharge of the electrolytic cell 1 and realize the square wave stress test. Therefore, by alternately running the electronic load 2 and the DC power supply 3, and coordinating the output of the square wave stress test script, the conditions for accelerated endurance testing can be achieved, such as Figure 3 The principle is that the electrolytic cell 1 can be charged and discharged, and the power supply and the electronic load 2 are used to alternately charge and discharge the electrolytic cell 1 quickly, so that the electrolytic cell 1 can be quickly switched between 1.5V and 0V, thereby achieving the purpose of accelerating the test.

[0035] Through the above technical scheme, the present invention connects the electrolytic cell 1, the DC power supply 3, and the electronic load 2 in parallel, in parallel, and in series through contactor point connection. This can not only satisfy the normal electrolysis of the electrolytic cell 1 by the DC power supply 3, but also eliminate the interference of the power supply during the impedance test of the electrolytic cell 1. At the same time, it can also meet the accelerated stress test, and can be a square wave stress test for rapid charge and discharge between 1.5V-0V, thereby realizing the accelerated stress test mentioned in the EU JRC standard. The performance verification of the electrolytic cell 1 in many aspects is realized, providing solid data support for its later industrialization.

[0036] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions 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 test system comprises an electrolytic cell, an electronic load, a direct current power supply and first to fifth contactors, wherein the anode of the electrolytic cell is connected to the positive electrode of the direct current power supply and one end of the fourth contactor, the negative electrode of the direct current power supply is respectively connected to one end of the first contactor and one end of the third contactor, the other end of the first contactor is respectively connected to 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 both connected to the positive electrode of the electronic load, and the negative electrode of the electronic load is connected to the other end of the third contactor and the other end of the fifth contactor; the test method of the test system is as follows: by opening and closing control of the first to fifth contactors, the electronic load is connected in series with the electrolytic cell and then connected in parallel with the direct current power supply as a whole, thereby eliminating interference of the direct current power supply in the EIS test; and the first to fifth contactors are simultaneously attracted to realize stress testing of the electrolytic cell.

2. The electrolytic cell performance testing system according to claim 1, characterized in that: The testing method of the testing system also includes: through the opening and closing control of the first contactor to the fifth contactor, the DC power supply is connected in parallel with the electrolytic cell, so that the DC power supply alone loads the electrolytic cell.

3. The electrolytic cell performance testing system according to claim 2, characterized in that: Through the opening and closing control of the first contactor to the fifth contactor, the DC power supply is connected in parallel with the electrolytic cell, so that the DC power supply alone loads the electrolytic cell, including: The first contactor is pulled in, and the second to fifth contactors are disconnected, and the DC power supply is directly connected in parallel with the electrolytic cell to realize the DC power supply loading the electrolytic cell and conduct polarization and durability performance tests.

4. The electrolytic cell performance testing system according to claim 1, characterized in that: Through the opening and closing control of the first contactor to the fifth contactor, the electronic load is connected in series with the electrolytic cell and then connected in parallel with the DC power supply as a whole, thereby eliminating the DC power supply interference in the EIS test, including: The second contactor and the third contactor are attracted, and the first contactor, the fourth contactor and the fifth contactor are disconnected. The DC power supply applies a constant voltage mode, and the electronic load applies a constant current mode. The electrolytic cell is loaded for electrolysis. At the same time, the electrochemical workstation is connected in parallel with the electrolytic cell to perform an EIS test.

5. The electrolytic cell performance testing system according to claim 1, characterized in that: The first to fifth contactors are simultaneously closed to implement stress testing of the electrolytic cell, including: The first contactor is attracted, and the second to fifth contactors are disconnected. At the same time, a DC power supply is used to apply a first preset voltage to the electrolytic cell. After the electrolytic cell is loaded with a constant voltage for a first preset time, the DC power supply is turned off and the first contactor is attracted at the same time. Subsequently, the fourth and fifth contactors are attracted, and the second and third contactors are disconnected. The electronic load is loaded with a constant current, and after the electrolytic cell is consumed to below the second preset voltage, the electronic load is turned off and the fourth and fifth contactors are disconnected. After running for a second preset time, the first contactor is attracted and a DC power supply is used to apply a first preset voltage to the electrolytic cell. The above steps are repeated to complete the charging and discharging of the electrolytic cell and realize the square wave stress test.

6. The electrolytic cell performance testing system according to claim 1, characterized in that: The first preset voltage has a value range of 1.4V to 1.5V.

7. The electrolytic cell performance testing system according to claim 1, characterized in that: The value range of the first preset time is 10s to 15s.

8. The electrolytic cell performance testing system according to claim 1, characterized in that: The second preset voltage has a value range of 0 to 0.1V.

9. The electrolytic cell performance testing system according to claim 1, characterized in that: The second preset time has a value range of 3 to 5 seconds.

10. 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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