Electrolysis system

Abstract

The embodiment of the utility model relates to an electrolysis system which comprises a plurality of electrolytic tanks, a plurality of electrolytic tanks and a plurality of electrolytic tanks, the first power supply module is used for converting clean energy into electric energy so as to generate a first direct-current power supply signal, and the first direct-current power supply signal is used for supplying power to each electrolytic cell; and the power supply switching module is connected with the first power supply module and the multiple electrolytic cells and used for controlling on-off of transmission paths of the first direct-current power supply signals, and the electrolytic cells are used for electrolysis under the condition that the power supply signals are received.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of electrolysis technology, and in particular, to an electrolysis system. Background Art

[0002] Electrolysis is a process in which an electric current is passed through an electrolyte solution or a molten electrolyte to cause a redox reaction at the electrode. Electrolysis is widely used in gas generation scenarios due to its advantages such as high energy conversion rate and strong controllability. However, the electrolysis process consumes a lot of electricity, and the power supply from the grid often cannot meet the power supply needs of the electrolysis process. Utility Model Content

[0003] Based on this, it is necessary to provide an electrolysis system to address the above technical problems.

[0004] In a first aspect, the present application provides an electrolysis system, comprising:

[0005] A plurality of electrolytic cells, some of which are of different types;

[0006] A first power supply module, used for converting clean energy into electrical energy to generate a first DC power supply signal, wherein the first DC power supply signal is used for supplying power to each of the electrolytic cells;

[0007] The power supply switching module is respectively connected to the first power supply module and the plurality of the electrolytic cells, and is used to control the on and off of the transmission path of each of the first DC power supply signals. The electrolytic cells are used to perform electrolysis when receiving the power supply signal.

[0008] In one embodiment, the first power supply module includes:

[0009] A power generation unit, used for converting clean energy into electrical energy and generating a first AC power supply signal;

[0010] An AC / DC conversion unit is connected to the power generation unit, and is used to convert the first AC power supply signal into the first DC power supply signal.

[0011] In one embodiment, the AC-DC conversion unit is further used to connect to a power grid to convert a second AC power supply signal output by the power grid into a second DC power supply signal;

[0012] The power supply switching module is further used to control the on / off of the transmission path of the second DC power supply signal.

[0013] In one embodiment, the power supply switching module includes:

[0014] a current detection unit, connected to the first power supply module, and configured to detect a current of the first DC power supply signal;

[0015] A path switching unit is connected to the current detection unit, and is used to conduct the transmission path of the second DC power supply signal when the current of the first DC power supply signal is less than a threshold current.

[0016] In one of the embodiments, the path switching unit includes:

[0017] a current comparison circuit, connected to the current detection unit, and configured to generate a first switching signal when the current of the first DC power supply signal is less than a threshold current;

[0018] A switching circuit is connected to the current comparison circuit and is used to conduct the transmission path of the second DC power supply signal when the first switching signal is received.

[0019] In one embodiment, the electrolytic cell includes a cathode terminal plate and an anode terminal plate, the switching circuit includes a plurality of relay assemblies, the plurality of relay assemblies correspond to the plurality of electrolytic cells one by one, and the relay assemblies include:

[0020] A first switch connected to the anode terminal plate of the corresponding electrolytic cell;

[0021] a second switch connected to the cathode terminal plate of the corresponding electrolytic cell;

[0022] The relay coil is connected to the current comparison circuit, the first switch and the second switch respectively, and is used to attract the first switch and the second switch to conduct the transmission path of the second DC power supply signal when receiving the first switching signal.

[0023] In one embodiment, it also includes:

[0024] a second power supply module connected to each of the electrolytic cells, the second power supply module being used to store electric energy and provide a third DC power supply signal to the electrolytic cells through the stored electric energy;

[0025] A voltmeter is connected to the second power supply module and the power supply switching module respectively, and the voltmeter is used to detect the voltage of the third DC power supply signal and output the voltage detection result to the power supply switching module.

[0026] In one of the embodiments, the first power supply module is also connected to at least one of the second power supply module and the power grid, and the first power supply module is also used to transmit part of the converted electric energy to at least one of the connected second power supply module and the power grid.

[0027] In one embodiment, the AC-DC conversion unit includes:

[0028] a rectifier transformer, connected to the power generation unit and the power supply switching module respectively, and configured to perform rectification and voltage transformation on the first AC power supply signal to generate the first DC power supply signal; or

[0029] The ACDC converter is connected to the power generation unit and the power supply switching module respectively, and is used to rectify and transform the first AC power supply signal to generate the first DC power supply signal.

[0030] In one embodiment, the plurality of electrolytic cells include at least two of an alkaline electrolytic cell, a proton exchange membrane electrolytic cell, a high temperature solid oxide electrolytic cell, and a solid polymer anion exchange membrane electrolytic cell.

[0031] The above-mentioned electrolysis system, by adopting the first power supply module, can generate electric energy based on clean energy, thereby providing an environmentally friendly and low-cost power supply method. In order to adapt to the characteristics of large volatility of clean energy, this embodiment sets up multiple electrolytic cells in parallel with different powers to deal with the problem of insufficient stability of the first DC power supply signal. Specifically, the power supply switching module can flexibly control the on-off of the transmission path of the power supply signal according to the situation of the first DC power supply signal, thereby simply and reliably realizing the switching of the working state of each electrolytic cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related technologies, the drawings required for use in the embodiments or the related technical descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 This is one of the structural schematic diagrams of an electrolysis system according to an embodiment;

[0034] Figure 2 This is a second structural schematic diagram of an electrolysis system according to an embodiment;

[0035] Figure 3 This is a third structural diagram of a power supply module according to an embodiment;

[0036] Figure 4 The fourth structural schematic diagram of the electrolysis system of one embodiment;

[0037] Figure 5 This is a fifth structural schematic diagram of an electrolysis system according to an embodiment.

[0038] Component number description:

[0039] Electrolytic cell: 100; first power supply module: 200; power generation unit: 210; AC / DC conversion unit: 220; power supply switching module: 300; current detection unit: 310; path switching unit: 320; current comparison circuit: 321; switching circuit: 322; relay assembly: 3221; relay coil: 3221A; second power supply module: 400; voltmeter: 500. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0041] It is understood that the terms "first", "second", etc. used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, without departing from the scope of this application, a first power supply module may be referred to as a second power supply module, and similarly, a second power supply module may be referred to as a first power supply module.

[0042] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. "Multiple" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined. "Several" means at least one, such as one, two, etc., unless otherwise clearly and specifically defined.

[0043] The present application embodiment provides an electrolysis system, Figure 1 FIG. 1 is a schematic diagram of a structure of an electrolysis system according to an embodiment of the present invention. Figure 1 In one embodiment, the electrolysis system includes a plurality of electrolytic cells 100 , a first power supply module 200 and a power supply switching module 300 .

[0044] A plurality of electrolyzers 100 are used to generate the same type of gas by electrolysis, for example, hydrogen. Compared with other energy sources, hydrogen energy has a high calorific value, and the combustion product is water. Therefore, hydrogen energy is currently considered to be the most environmentally friendly energy source. In the related art, mainstream hydrogen production technologies include alkaline water electrolysis (ALK), proton exchange membrane water electrolysis (PEM), etc. Among them, alkaline water electrolysis technology has the problem of slow hydrogen production response, while proton exchange membrane water electrolysis technology has problems such as high cost. Therefore, by adopting multiple electrolyzers 100 of different types, this embodiment can be controlled based on the differences in power, gas generation speed, etc. between different types of electrolyzers 100, so as to balance the advantages and disadvantages of various types of electrolyzers 100, thereby improving the overall performance of the electrolysis system.

[0045] The first power supply module 200 is used to convert clean energy into electrical energy to generate a first DC power supply signal, and the first DC power supply signal is used to power each electrolyzer 100. Among them, the type of clean energy can be but is not limited to one or more combinations of wind, light, and water. It is understandable that the process of electrolyzing water to produce hydrogen consumes a high amount of electricity. Therefore, the use of clean energy can greatly reduce the energy cost of the electrolysis system. However, clean energy such as wind, light, and water will be affected by the climate environment and have the characteristics of intermittent and instability. The above characteristics cause the first DC power supply signal output by the first power supply module 200 to have a certain volatility, and put forward higher requirements for the working control of the electrolyzer 100.

[0046] The power supply switching module 300 is respectively connected to the first power supply module 200 and multiple electrolytic cells 100, and is used to control the on and off of the transmission path of each first DC power supply signal. The electrolytic cell 100 is used to perform electrolysis when receiving the power supply signal. That is, when the transmission path of the first DC power supply signal is turned on, the electrolytic cell 100 can receive the first DC power supply signal and perform electrolysis. When the transmission path of the first DC power supply signal is disconnected, the electrolytic cell 100 does not receive the first DC power supply signal, but it should be noted that the electrolytic cell 100 that has not received the first DC power supply signal can also perform electrolysis under the drive of other DC power supply signals, which is not limited here.

[0047] In an exemplary manner, if the power of the first DC power supply signal is insufficient, the power supply switching module 300 can conduct the transmission path of the first DC power supply signal of some electrolytic cells 100 according to the information of the first DC power supply signal and the power requirements of each electrolytic cell 100, so that the above-mentioned electrolytic cell 100 receives the first DC power supply signal that meets its power requirements. At the same time, the power supply switching module 300 can disconnect the transmission path of the first DC power supply signal of the remaining electrolytic cells 100 to stop the above-mentioned electrolytic cells 100. In another exemplary manner, if the power of the first DC power supply signal is appropriate, the power supply switching module 300 can conduct the transmission path of the first DC power supply signal of all electrolytic cells 100 to maximize the gas generation rate of the electrolysis system. Therefore, the power supply switching module 300 can adjust the working state of different electrolytic cells 100 according to the fluctuation of the first DC power supply signal, thereby realizing adaptive adjustment of the fluctuation of the first DC power supply signal. Moreover, the above adjustment can also keep the current input into the electrolytic cell 100 in a relatively stable state, thereby reducing the impact of signal fluctuations on the electrolytic cell 100 , thereby effectively extending the service life of the electrolytic cell 100 .

[0048] In this embodiment, by adopting the first power supply module 200, electric energy can be generated based on clean energy, thereby providing an environmentally friendly and low-cost power supply method. Moreover, in order to adapt to the characteristics of large volatility of clean energy, this embodiment also provides multiple electrolytic cells 100 with different powers to deal with the problem of insufficient stability of the first DC power supply signal. Specifically, the power supply switching module 300 can flexibly control the on-off of the transmission path of the power supply signal according to the situation of the first DC power supply signal, thereby simply and reliably realizing the switching of the working state of each electrolytic cell 100.

[0049] In one embodiment, the electrical circuit between the first power supply module 200 and the power supply switching module 300 is covered with an explosion-proof tube. The explosion-proof tube has the advantages of flame resistance, corrosion resistance, water resistance, aging resistance, good flexibility, firm structure, reliable operation, etc. Therefore, the electrical circuit between the first power supply module 200 and the power supply switching module 300 can be ensured to operate reliably and safely.

[0050] Figure 2 This is a second schematic diagram of the structure of an electrolysis system according to an embodiment, referring to Figure 2In one embodiment, the first power supply module 200 includes a power generation unit 210 and an AC / DC conversion unit 220. The power generation unit 210 is used to convert clean energy into electrical energy and generate a first AC power supply signal. Specifically, the wind power unit usually adopts an asynchronous generator, so that the frequency and voltage of the generated electrical signal increase with the increase of the rotation speed. The AC / DC conversion unit 220 is connected to the power generation unit 210, and the AC / DC conversion unit 220 is used to convert the first AC power supply signal into a first DC power supply signal. The electrolytic cell 100 needs to be powered by a DC signal. Therefore, the AC / DC conversion unit 220 is introduced here to convert the first AC power supply signal generated by the power generation unit 210, so as to generate a first DC power supply signal that can power the electrolytic cell 100. Further, the AC / DC conversion unit 220 may include any one of a half-wave rectifier circuit, a full-wave rectifier circuit, a bridge rectifier circuit, etc., which is not limited in this embodiment.

[0051] In one embodiment, the AC / DC conversion unit 220 is also used to connect to the power grid to convert the second AC power supply signal output by the power grid into a second DC power supply signal. Among them, the power supply switching module 300 is also used to control the on-off of the transmission path of the second DC power supply signal. It is understandable that the electrolyzer 100 cannot be restarted instantly after completely stopping operation, so it is difficult to adapt to the scenario with high volatility of the first DC power supply signal. Moreover, frequent start-stop switching will cause hydrogen to accumulate at the anode and penetrate to the cathode through the membrane, causing serious safety problems in the electrolyzer 100. Therefore, in the case where the first DC power supply signal cannot meet the needs of all electrolyzers 100, the access strategy of the second DC power supply signal can be selected according to demand. In an exemplary manner, all electrolyzers 100 can be connected to the second DC power supply signal, that is, all electrolyzers 100 are powered by the power grid. In another exemplary manner, part of the electrolyzer 100 can also be connected to the first DC power supply signal, and another part of the electrolyzer 100 can be connected to the second DC power supply signal to keep the above electrolyzers 100 in an open state.

[0052] Further, the AC / DC conversion unit 220 may only provide a second DC power supply signal with a standby voltage to the electrolyzer 100, so that the electrolyzer 100 is in an on state but does not produce hydrogen. The AC / DC conversion unit 220 may also provide a second DC power supply signal that meets the working voltage requirement of the electrolyzer 100, so that the electrolyzer 100 continues to electrolyze and produce hydrogen. Further, the AC / DC conversion unit 220 may include two AC / DC conversion components, one of which is used to convert a first AC power supply signal into a first DC power supply signal, and the other AC / DC conversion component is used to convert a second AC power supply signal into a second DC power supply signal, and the two AC / DC conversion components work independently of each other. In this embodiment, by connecting the AC / DC conversion unit 220 to the power grid, a power supply method combining clean energy and the power grid can be realized, thereby ensuring that the electrolysis system works efficiently and stably when the electric energy converted and generated by the first power supply module 200 is insufficient.

[0053] In one embodiment, the first power supply module 200 is also connected to the power grid (not shown), and the first power supply module 200 is also used to transmit part of the converted electric energy to the power grid. Specifically, when the current of the first DC power supply signal is higher than the rated current of the electrolyzer 100, the first power supply module 200 can transmit part of the converted electric energy to the power grid. On the one hand, the above working method can store electric energy more effectively and improve the utilization rate of electric energy generated by clean energy generation. On the other hand, it can also reduce the current of the first DC power supply signal transmitted to the electrolyzer 100, thereby avoiding the current of the power supply signal received by the electrolyzer 100 being too high, thereby reducing the impact of large current on the stability and safety of the electrolyzer 100.

[0054] Figure 3 This is a third structural diagram of a power supply module according to an embodiment, referring to Figure 3In one embodiment, the power supply switching module 300 includes a current detection unit 310 and a path switching unit 320. Among them, the current detection unit 310 is connected to the first power supply module 200 for detecting the current of the first DC power supply signal. Specifically, any one of a sensing resistor, a current transformer, a Hall effect sensor, and an ammeter can be used to detect the current of the first DC power supply signal. The path switching unit 320 is connected to the current detection unit 310 and is used to conduct the transmission path of the second DC power supply signal when the current of the first DC power supply signal is less than the threshold current. Specifically, the threshold current can be the minimum operating current of the electrolytic cell 100. The path switching unit 320 can independently control the transmission paths of the first DC power supply signal and the second DC power supply signal of each electrolytic cell 100, so that different electrolytic cells 100 can work under the drive of different DC power supply signals. Optionally, the path switching unit 320 may include any one of a switch and a multiplexer, and the switch may further include any one of the types of relay components 3221, contactors, electronic switches, photoelectric couplers, etc., which are not limited in this embodiment. In this embodiment, by detecting the current of the first DC power supply signal and comparing it with the minimum operating current of the electrolytic cell 100, it is possible to accurately determine whether the first power supply module 200 has generated sufficient electrical energy. Therefore, when the electrical energy generated by the first power supply module 200 is insufficient, the second DC power supply signal is promptly accessed through the path switching unit 320 to ensure the normal operation of each electrolytic cell 100 in the electrolysis system.

[0055] Continue to refer Figure 3 In one embodiment, the path switching unit 320 includes a current comparison circuit 321 and a switching circuit 322. The current comparison circuit 321 is connected to the current detection unit 310, and is used to generate a first switching signal when the current of the first DC power supply signal is less than the threshold current. Specifically, the current comparison circuit 321 may include a sampling circuit and a first comparator. The sampling circuit is used to collect the current of the first DC power supply signal, generate a corresponding sampling voltage, and transmit the sampling voltage to an input end of the first comparator. The other input end of the first comparator is used to receive a threshold voltage corresponding to the threshold current. Based on the corresponding relationship between the current and the voltage, the magnitude relationship between the sampling voltage and the threshold voltage can reflect the magnitude relationship between the current of the first DC power supply signal and the threshold current. Based on the comparison result, the first comparator can output a corresponding high-level or low-level digital signal, that is, the first switching signal is a high-level or low-level digital signal. The switching circuit 322 is connected to the current comparison circuit 321, and is used to conduct the transmission path of the second DC power supply signal when the first switching signal is received. That is, when the current of the first DC power supply signal is less than the threshold current, the transmission path of the second DC power supply signal is turned on, so that the electrolytic cell 100 is powered by the power grid.

[0056] In one of the embodiments, when the output power of the first power supply module 200 is reduced, the power of the electrolytic cell 100 with the largest total voltage degradation can be preferentially reduced. The total voltage degradation can be determined by the voltage degradation rate and the operating time, wherein the voltage degradation rate includes the voltage degradation rate under the operating conditions of maintaining operation, low power fluctuation operation, constant turning power operation, high power fluctuation operation, and constant rated power operation, and the operating time includes the operating time under the operating conditions of maintaining operation, low power fluctuation operation, constant turning power operation, high power fluctuation operation, and constant rated power operation. In this embodiment, by collecting the operating conditions of each electrolytic cell 100 and calculating the voltage degradation online to determine the power distribution order of each electrolytic cell 100, the control efficiency can be effectively improved and the complexity of the control system can be reduced. Through the allocation strategy of first step by step and then average, the start-stop sequence optimization is designed to ensure the consistency of multi-stack aging, reduce the operating time of each electrolyzer 100 in the high power range, effectively delay the aging of the multi-stack electrolyzer 100 array under rapid power shocks, improve the system energy utilization rate, and ensure the efficient and stable operation of the multi-stack electrolyzer 100 electrolysis system that adapts to rapid power shocks.

[0057] In one embodiment, the electrolytic cell 100 includes a cathode terminal plate and an anode terminal plate, the anode terminal plate is electrically connected to the anode component, and the cathode terminal plate is electrically connected to the cathode component. Specifically, the electrolytic cell 100 includes an anode sub-cell and a cathode sub-cell. An anode component is provided inside the anode sub-cell, and the anode component is connected to the anode terminal plate. A cathode component is provided inside the cathode sub-cell, and the cathode component is connected to the cathode terminal plate, so that the power supply signal from the power supply switching module 300 is provided to the anode component and the cathode component. Figure 4 This is a fourth structural diagram of an electrolysis system according to an embodiment, referring to Figure 4 The switching circuit 322 includes a plurality of relay components 3221, and the plurality of relay components 3221 correspond to a plurality of electrolytic cells 100 one by one, so that one relay component 3221 controls the on and off of the transmission path of the power supply signal of the corresponding electrolytic cell 100. The relay component 3221 includes a first switch S1, a second switch S2 and a relay coil 3221A. Among them, the first switch S1 is connected to the anode terminal board of the corresponding electrolytic cell 100, and the second switch S2 is connected to the cathode terminal board of the corresponding electrolytic cell 100. The relay coil 3221A is respectively connected to the current comparison circuit 321, the first switch S1 and the second switch S2, and the relay coil 3221A is used to attract the first switch S1 and the second switch S2 to conduct the transmission path of the second DC power supply signal when receiving the first switching signal. It should be noted that in order to simplify the drawings, Figure 4 The input paths of the power supply signals of the first switch S1 and the second switch S2 are not shown.

[0058] Therefore, when the electric energy converted and generated by the first power supply module 200 is insufficient, the relay component 3221 can flexibly control the working state of each electrolyzer 100, thereby realizing the adaptation to the wide power fluctuation of the first DC power supply signal. Further, different relay coils 3221A may not receive the first switching signal at the same time, so that multiple electrolyzers 100 can work under the drive of the first power supply signal in a time-sharing manner, thereby ensuring the continuous hydrogen output of the electrolysis system and making the aging degree of each electrolyzer 100 in the electrolysis system similar. It is understandable that the number of electrolyzers 100 driven simultaneously by the first power supply signal can be determined according to the amount of electric energy converted and generated, thereby realizing flexible adjustment. Further, the rated power of each electrolyzer 100 can be combined to more accurately select the power supply object of the first power supply signal. For example, when the power of the first DC power supply signal is high, multiple electrolyzers 100 with higher rated power can be selected, and when the power of the first DC power supply signal is low, multiple electrolyzers 100 with lower rated power can be selected. In this embodiment, based on the above method, the electrolysis system can maintain a relatively stable hydrogen production efficiency under different input powers of the first DC power supply signal.

[0059] In one embodiment, the power supply switching module 300 is installed in an explosion-proof cabinet to prevent sparks generated when the first switch S1 and the second switch S2 are closed from endangering the entire electrolysis system, thereby further improving the explosion-proof performance of the entire electrolysis system.

[0060] In one embodiment, the electrical circuit between the anode terminal plate and the first switch S1 is covered with an explosion-proof tube, and the electrical circuit between the cathode terminal plate and the second switch S2 is also covered with an explosion-proof tube, thereby ensuring reliable and safe operation of the above circuits.

[0061] In one embodiment, if the power of the first DC power supply signal exceeds a preset threshold, the current of the rectifier transformer can be reduced, and the excess power can be evenly distributed to the electrolytic cells 100. The preset threshold can be determined according to the rated power of each electrolytic cell 100, and the excess power refers to the power difference between the output power of the first power supply module 200 and the total value of the rated power of the activated electrolytic cells 100. In this embodiment, by evenly distributing the excess power to each activated electrolytic cell 100, the electric energy can be effectively utilized, and it can also ensure that the working power of each electrolytic cell 100 remains within a certain range, thereby effectively ensuring the service life of the electrolytic cell 100.

[0062] Figure 5 FIG. 5 is a schematic diagram of the structure of an electrolysis system according to an embodiment of the present invention. Figure 5In one embodiment, the electrolysis system further includes a second power supply module 400 and a voltmeter 500. The second power supply module 400 is connected to each electrolytic cell 100, and the second power supply module 400 is used to store electric energy and provide a third DC power supply signal to the electrolytic cell 100 through the stored electric energy. That is, the second power supply module 400 can be understood as an energy storage battery, and the second power supply module 400 provides the third DC power supply signal through the stored electric energy. Therefore, the third DC power supply signal is not affected by environmental factors and has good stability, thereby reducing the impact of the fluctuation of the power supply signal on the electrolytic cell 100. The voltmeter 500 is connected to the second power supply module 400 and the power supply switching module 300 respectively, and the voltmeter 500 is used to detect the voltage of the third DC power supply signal and output the voltage detection result to the power supply switching module 300. Specifically, the power supply switching module 300 can start the first power supply module 200 when the voltage detection result of the voltmeter 500 is lower than the first power threshold. The power supply switching module 300 can also start the first power supply module 200 when the voltage detection result of the voltmeter 500 is higher than the second power threshold. Among them, the second power threshold is higher than the first power threshold, and the first power threshold and the second power threshold are determined according to the power supply requirements of each electrolytic cell 100 in the electrolysis system. In this embodiment, if the second power supply module 400 has a large amount of power, the second power supply module 400 can directly supply power to each electrolytic cell 100 to ensure stable operation of the electrolysis system. If the second power supply module 400 has a small amount of power, the first power supply module 200 can be turned on so that the first power supply module 200 and the second power supply module 400 can supply power to the electrolytic cell 100 together, thereby avoiding the situation where the electrolytic cell 100 is suddenly powered off when the second power supply module 400 is exhausted, thereby improving the reliability of power supply.

[0063] In one embodiment, the first power supply module 200 is also connected to the second power supply module 400 (not shown), and the first power supply module 200 is also used to transmit part of the converted electric energy to the connected second power supply module 400. That is, the electric energy stored in the second power supply module 400 can come from the first power supply module 200. In this embodiment, the second power supply module 400 is charged by the first power supply module 200, and even if the output of the first power supply module 200 has a large fluctuation, the impact on the third DC power supply signal output by the second power supply module 400 can be ignored, so that the electrolytic cell 100 can receive a stable and continuous third DC power supply signal.

[0064] In one embodiment, the AC / DC conversion unit 220 includes a rectifier transformer and an ACDC converter. The rectifier transformer is connected to the power generation unit and the power supply switching module, respectively, and is used to rectify and transform the first AC power supply signal to generate a first DC power supply signal; or the ACDC converter is connected to the power generation unit and the power supply switching module, respectively, and is used to rectify and transform the first AC power supply signal to generate a first DC power supply signal.

[0065] In one embodiment, the plurality of electrolyzers 100 include at least two of an alkaline electrolyzer 100, a proton exchange membrane electrolyzer 100, a high temperature solid oxide electrolyzer 100, and a solid polymer anion exchange membrane electrolyzer 100. Exemplarily, the plurality of electrolyzers 100 may include an alkaline electrolyzer 100 and a proton exchange membrane electrolyzer 100, and the number of each type of electrolyzer 100 may be one or more, which is not limited here. In this embodiment, a large range of power regulation is achieved through a combination of electrolytic hydrogen production configurations of multiple electrolyzers 100. Furthermore, the plurality of electrolyzers 100 may adopt an electrolyzer 100 parallel structure, thereby effectively improving the response rate to rapid fluctuations, and the current input to the electrolyzer 100 may be kept in a stable state, thereby extending the service life of the alkaline electrolyzer 100, and eliminating the problems of renewable energy generation and high frequency fluctuations.

[0066] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0067] The above embodiments only express several implementation methods of the embodiments of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the embodiments of the present application, and these all belong to the protection scope of the embodiments of the present application. Therefore, the protection scope of the patent of the embodiments of the present application shall be subject to the attached claims.

Claims

1. An electrolysis system, characterized in that: include: A plurality of electrolytic cells, some of which are of different types; A first power supply module, used for converting clean energy into electrical energy to generate a first DC power supply signal, wherein the first DC power supply signal is used for supplying power to each of the electrolytic cells; The power supply switching module is respectively connected to the first power supply module and the plurality of the electrolytic cells, and is used to control the on and off of the transmission path of each of the first DC power supply signals. The electrolytic cells are used to perform electrolysis when receiving the power supply signal.

2. The electrolysis system according to claim 1, characterized in that: The first power supply module comprises: A power generation unit, used for converting clean energy into electrical energy and generating a first AC power supply signal; An AC / DC conversion unit is connected to the power generation unit, and is used to convert the first AC power supply signal into the first DC power supply signal.

3. The electrolysis system according to claim 2, characterized in that: The AC / DC conversion unit is also used to connect to a power grid to convert a second AC power supply signal output by the power grid into a second DC power supply signal; The power supply switching module is further used to control the on / off of the transmission path of the second DC power supply signal.

4. The electrolysis system according to claim 3, characterized in that: The power supply switching module comprises: a current detection unit, connected to the first power supply module, and configured to detect a current of the first DC power supply signal; A path switching unit is connected to the current detection unit, and is used to conduct the transmission path of the second DC power supply signal when the current of the first DC power supply signal is less than a threshold current.

5. The electrolysis system according to claim 4, characterized in that: The path switching unit comprises: a current comparison circuit, connected to the current detection unit, and configured to generate a first switching signal when the current of the first DC power supply signal is less than a threshold current; A switching circuit is connected to the current comparison circuit and is used to conduct the transmission path of the second DC power supply signal when the first switching signal is received.

6. The electrolysis system according to claim 5, characterized in that: The electrolytic cell comprises a cathode terminal plate and an anode terminal plate, the switching circuit comprises a plurality of relay components, the plurality of relay components respectively correspond to the plurality of electrolytic cells one by one, and the relay components comprise: A first switch connected to the anode terminal plate of the corresponding electrolytic cell; a second switch connected to the cathode terminal plate of the corresponding electrolytic cell; The relay coil is connected to the current comparison circuit, the first switch and the second switch respectively, and is used to attract the first switch and the second switch to conduct the transmission path of the second DC power supply signal when receiving the first switching signal.

7. The electrolysis system according to claim 3, characterized in that: Also includes: a second power supply module connected to each of the electrolytic cells, the second power supply module being used to store electric energy and provide a third DC power supply signal to the electrolytic cells through the stored electric energy; A voltmeter is connected to the second power supply module and the power supply switching module respectively, and the voltmeter is used to detect the voltage of the third DC power supply signal and output the voltage detection result to the power supply switching module.

8. The electrolysis system according to claim 7, characterized in that: The first power supply module is also connected to at least one of the second power supply module and the power grid, and the first power supply module is also used to transmit part of the converted electric energy to at least one of the connected second power supply module and the power grid.

9. The electrolysis system according to claim 2, characterized in that: The AC / DC conversion unit comprises: a rectifier transformer, connected to the power generation unit and the power supply switching module respectively, and configured to rectify and transform the first AC power supply signal to generate the first DC power supply signal; or The ACDC converter is connected to the power generation unit and the power supply switching module respectively, and is used to rectify and transform the first AC power supply signal to generate the first DC power supply signal.

10. The electrolysis system according to any one of claims 1 to 9, characterized in that: The plurality of electrolytic cells include at least two of alkaline electrolytic cells, proton exchange membrane electrolytic cells, high temperature solid oxide electrolytic cells and solid polymer anion exchange membrane electrolytic cells.

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