Electrolytic bath series grouping structure of PEM electrolytic hydrogen production system and electrolytic bath management system

Abstract

The invention provides an electrolytic cell series-connection group structure of a PEM electrolytic hydrogen production system and an electrolytic cell pipeline system. The electrolytic cell series-connection group structure comprises at least three PEM electrolytic cell modules, a switching end plate and a group control assembly. The upper end face of the switching end plate is fixedly connected with the lower end plate of one PEM electrolytic cell module, and the lower end face of the switching end plate is fixedly connected with the upper end plate of the other PEM electrolytic cell module; the grouped control assembly is connected with the PEM electrolytic cell modules and used for controlling whether two adjacent PEM electrolytic cell modules are connected in series in the PEM electrolytic hydrogen production system or not and controlling whether any one PEM electrolytic cell module is short-circuited or not. According to the flexible grouping technology provided by the invention, flexible connection and efficient grouping of a plurality of electrolytic cell modules can be realized.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen production by electrolyzing water, and particularly to a series connection structure of electrolytic cells and an electrolytic cell management system for a PEM electrolytic hydrogen production system. Background Art

[0002] Using "green electricity" generated from new energy sources such as photovoltaic and wind to produce "green hydrogen" has gradually become the consensus in the industry. The PEM electrolytic hydrogen production system has the characteristics of high current density and strong adaptability to the fluctuating power of new energy, and is considered an important development direction for electrolytic hydrogen production equipment. The single cell voltage of a PEM electrolytic cell is relatively low, and usually multiple single cells are connected in series, as Figure 1 shown; this series connection method can adapt to the voltage of the new energy power grid and improve the efficiency of the electrolytic hydrogen production equipment. However, when a single cell in the electrolytic cell fails (such as excessive polarization impedance, membrane penetration, etc.), the entire electrolytic cell cannot be used; in addition, for single cells with the same working current, products from different manufacturers or different models of the same manufacturer cannot be connected in series and stacked for use. Many such problems require a new solution for the series connection of cells.

[0003] It should be noted that the above introduction of the technical background is only for the convenience of clearly and completely explaining the technical solution of the present application and facilitating the understanding of those skilled in the art. It cannot be considered that the above technical solutions are well-known to those skilled in the art just because these solutions are described in the background art part of the present application. Summary of the Invention

[0004] In view of the above-mentioned disadvantages of the prior art, the purpose of the present invention is to provide a series connection structure of electrolytic cells and an electrolytic cell management system for a PEM electrolytic hydrogen production system, which are used to solve the problems in the prior art that the entire electrolytic stack cannot be used due to the failure of a single cell, products from different manufacturers or different models of the same manufacturer cannot be connected in series and stacked for use, and multiple PEM electrolytic cells cannot be directly connected in series and stacked for use.

[0005] To achieve the above purpose and other related purposes, the present invention provides a series connection structure of electrolytic cells for a PEM electrolytic hydrogen production system, including at least three PEM electrolytic cell modules, a transfer end plate, and a grouping control component;

[0006] The upper end surface of the transfer end plate is fixedly connected to the lower end plate of one PEM electrolytic cell module, and the lower end surface of the transfer end plate is fixedly connected to the upper end plate of the other PEM electrolytic cell module;

[0007] The grouping control component is connected to the PEM electrolytic cell module, and is used to control whether two adjacent PEM electrolytic cell modules are connected in series in the PEM electrolytic hydrogen production system and control whether any one PEM electrolytic cell module is short-circuited.

[0008] Optionally, a hole is provided on the lower end surface of the adapter end plate, and the hole forms a coupling structure with a pressing member provided on the upper end surface of the PEM electrolytic cell module.

[0009] Optionally, the group control assembly includes a series control assembly and a short-circuit control assembly;

[0010] The series control assembly is connected to any two adjacent PEM electrolytic cell modules, and is used to control whether the two adjacent PEM electrolytic cell modules are connected in series in the PEM electrolytic hydrogen production system;

[0011] The short-circuit control assembly is connected to each PEM electrolytic cell module, and is used to control whether the PEM electrolytic cell module connected thereto is short-circuited.

[0012] Optionally, the series control assembly includes a plurality of series connection members. One end of each series connection member is connected to the copper bar at the lower end of the PEM electrolytic cell module connected to the upper end surface of the adapter end plate, and the other end is connected to the copper bar at the upper end of the PEM electrolytic cell module connected to the lower end surface of the adjacent adapter end plate.

[0013] Optionally, the short-circuit control assembly includes a plurality of short-circuit connection members. One end of each short-circuit connection member is connected to the copper bar at the upper end of a PEM electrolytic cell module, and the other end is connected to the copper bar at the lower end of a PEM electrolytic cell module.

[0014] Optionally, the state of the series control assembly connected to the same PEM electrolytic cell module is different from the state of the short-circuit control assembly.

[0015] Optionally, both the series connection members and the short-circuit connection members are semi-I-shaped copper bars.

[0016] To achieve the above and other related purposes, the present invention further provides an electrolytic cell management system for a PEM electrolytic hydrogen production system, which is suitable for managing the series grouping structure of the electrolytic cells of the above-mentioned PEM electrolytic hydrogen production system. The electrolytic cell management system includes a plurality of management units EMU, a control unit ECU, and a switch array;

[0017] The switch array is connected to the PEM electrolytic cell module; the switch array is the group control assembly, and the group control assembly uses a DC circuit breaker;

[0018] Each management unit EMU is connected to a PEM electrolyzer cell module and a group of switch units in the switch array. The management unit EMU collects the status parameters of the corresponding PEM electrolyzer cell module, processes the status parameters to generate control instructions to control the switching of the corresponding switch units in the switch array, so as to realize the withdrawal or entry of the PEM electrolyzer cell module from the PEM electrolyzer cell module series queue; at the same time, the electrolyzer PACK parameters of the PEM electrolyzer cell module are transmitted to the control unit.

[0019] The control unit ECU is connected to all management units. The control unit ECU receives the electrolyzer PACK parameters transmitted by the management unit EMU and realizes the management and control of the PEM electrolyzer cell module series queue according to the electrolyzer PACK parameters.

[0020] Optionally, the status parameters at least include the PEM electrolyzer cell module voltage, the PEM electrolyzer cell module current, the PEM electrolyzer cell module temperature, the PEM electrolyzer cell module inlet water temperature, the PEM electrolyzer cell module outlet water temperature, and the single cell voltage in the PEM electrolyzer cell module.

[0021] Optionally, each group of switch units includes a series switch and a short-circuit switch; the series switch is used to realize the series connection of the PEM electrolyzer cell module into the PEM electrolyzer cell module series queue; the open-circuit switch is used to realize the withdrawal of the PEM electrolyzer cell module from the PEM electrolyzer cell module series queue.

[0022] As described above, the electrolyzer cell series connection structure and the electrolyzer management system of the PEM electrolysis hydrogen production system of the present invention have the following beneficial effects:

[0023] The electrolyzer cell series connection structure of the PEM electrolysis hydrogen production system of the present invention can realize the direct stacking of multiple PEM electrolyzer cell modules up and down by using an adapter end plate; thus ensuring that the multi-electrolyzer cell module series connection structure is consistent with the traditional single electrolyzer external connection structure, that is, from the appearance, it still looks like the appearance of an electrolyzer; and through the group control component, the PEM electrolyzer cell module can be flexibly connected in series or short-circuited, which is convenient for the maintenance of a single electrolyzer or automatically matching the number of PEM electrolyzer cells according to the power requirement. The flexible grouping technology proposed by the present invention can realize the flexible connection and efficient grouping of multiple electrolyzer cell modules, and further realize the low-cost, stable, efficient and safe operation of the PEM electrolysis water hydrogen production system. Brief Description of the Drawings

[0024] Figure 1 It shows a schematic structural diagram of a PEM electrolyzer composed of series-connected single cells in the prior art.

[0025] Figure 2 It shows a schematic structural diagram of direct stacking of multiple PEM electrolyzer cell modules in the prior art.

[0026] Figure 3 It shows a schematic structural diagram of the stacking of multiple PEM electrolyzer modules in the present invention.

[0027] Figure 4 It shows a schematic structural diagram of the series connection of electrolyzer modules in a PEM electrolytic hydrogen production system in a specific embodiment of the present invention.

[0028] Figure 5 It shows a schematic structural diagram of the series connection of three PEM electrolyzer modules in a specific embodiment of the present invention.

[0029] Figure 6 It shows a schematic diagram of the principle of the electrolyzer management system of a PEM electrolytic hydrogen production system in a specific embodiment of the present invention.

[0030] Figure 7 It shows a control schematic diagram of the series connection structure of three PEM electrolyzer modules in a specific embodiment of the present invention. Detailed implementation manners

[0031] The following uses specific specific examples to illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0032] Please refer to Figure 1-7 . It should be noted that the diagrams provided in this embodiment only illustrate the basic concept of the present invention in a schematic manner. Therefore, only the components related to the present invention are shown in the diagrams, rather than being drawn according to the number, shape, and size of the components in actual implementation. The type, quantity, and ratio of each component in actual implementation can be arbitrarily changed, and the component layout type may also be more complex.

[0033] Embodiment 1

[0034] The series connection structure of the electrolyzer of a PEM electrolytic hydrogen production system provided by a specific embodiment of the present invention includes at least three PEM electrolyzer modules, a transfer end plate, and a grouping control component;

[0035] The upper end surface of the transfer end plate is fixedly connected to the lower end plate of a PEM electrolyzer module, and the lower end surface of the transfer end plate is fixedly connected to the upper end plate of the other PEM electrolyzer module;

[0036] The grouping control component is connected to the PEM electrolyzer module and is used to control whether two adjacent PEM electrolyzer modules are connected in series in the PEM electrolytic hydrogen production system and control whether any one PEM electrolyzer module is short-circuited.

[0037] The series-connected structure of the electrolytic cells of the PEM electrolytic hydrogen production system of the present invention can achieve the direct stacking of multiple PEM electrolytic cell modules up and down by using an adapter end plate; thus ensuring that the series-connected structure of multiple electrolytic cell modules is the same as the traditional external connection structure of a single electrolytic cell, that is, from the appearance, it still looks like the shape of an electrolytic cell; and through the group control component, the PEM electrolytic cell modules can be flexibly connected in series or short-circuited, which is convenient for overhauling a single electrolytic cell or automatically matching the number of PEM electrolytic cells according to power requirements.

[0038] In order to ensure the good sealing of the PEM electrolytic cell module, pressing components such as bolts and spring washers are required to provide an external pressing force to tightly press the components in the PEM electrolytic cell module together; however, such a structure will form a protruding structure on the upper end plate of the PEM electrolytic cell module, as Figure 2 shown by the dotted circle in the figure, resulting in the inability to directly stack two PEM electrolytic cell modules up and down. For this reason, the present invention proposes an adapter end plate for realizing the connection and installation of two PEM electrolytic cell modules, as Figure 3 shown in the figure. The lower end face of the adapter end plate is provided with holes, and the holes form a coupling structure with the pressing components arranged on the upper end face of the PEM electrolytic cell module. Specifically, circular holes or square holes and other holes are formed on the lower end face of the adapter end plate through mechanical processing or other means, and their positions and sizes are the same as those of the nuts, spring washers, etc. in the upper end plate of the electrolytic cell module below the adapter end plate of the PEM electrolytic cell module, forming a compatible and coupling structure. Under the action of the adapter end plate, two PEM electrolytic cell modules can be directly stacked up and down. In order to ensure the fixation and stability of the two PEM electrolytic cell modules, fasteners are fixed to the lower end plate of the PEM electrolytic cell module 1 connected to the upper end face of the adapter end plate and the upper end plate of the PEM electrolytic cell module 2 connected to the lower end face of the adapter end plate, and the two PEM electrolytic cell modules are fixedly connected by the tight pressing of the lower end plate of the PEM electrolytic cell module 1 and the upper end plate of the PEM electrolytic cell module 2.

[0039] In a specific embodiment of the present invention, as Figure 1 shown, water and gas channels are reserved on the upper and lower end plates of the PEM electrolytic cell module. Therefore, it is not necessary to consider the water and gas passageways in the adapter end plate between the PEM electrolytic cell modules.

[0040] In a specific embodiment of the present invention, the group control component includes a series control component and a short-circuit control component;

[0041] The series control component is connected to any two adjacent PEM electrolytic cell modules, and is used to control whether the two adjacent PEM electrolytic cell modules are connected in series in the PEM electrolytic hydrogen production system;

[0042] The short-circuit control component is connected to each PEM electrolytic cell module, and is used to control whether the connected PEM electrolytic cell module is short-circuited.

[0043] Specifically, the present invention enables adjacent two PEM electrolyzer modules to be connected in series or withdrawn from the PEM electrolytic hydrogen production system through a series connection control component, and enables a PEM electrolyzer module connected thereto to be short-circuited or not in the PEM electrolytic hydrogen production system through a short-circuit control component. That is to say, the PEM electrolyzer module can be controlled to enter or exit the electrolyzer PACK according to the actual needs of the PEM electrolytic hydrogen production system, and can automatically withdraw in case of a fault; it can also automatically match the number of PEM electrolyzers according to the power requirement.

[0044] In a specific embodiment of the present invention, the series connection control component includes a plurality of series connection members. One end of each series connection member is connected to the copper bar at the lower end of the PEM electrolyzer module connected to the upper end surface of the transfer end plate, and the other end is connected to the copper bar at the upper end of the PEM electrolyzer module connected to the lower end surface of the adjacent transfer end plate. Specifically, the present invention realizes the electrical connection of the PEM electrolyzer modules on both sides of the transfer end plate through the series connection members with the diagonal filling area structure as shown in Figure 4 the figure.

[0045] In a specific embodiment of the present invention, the short-circuit control component includes a plurality of short-circuit connection members. One end of each short-circuit connection member is connected to the copper bar at the upper end of a PEM electrolyzer module, and the other end is connected to the copper bar at the lower end of a PEM electrolyzer module. Specifically, the present invention realizes the short-circuit connection control of a PEM electrolyzer module through the short-circuit connection members with the grid filling area structure as shown in Figure 4 the figure.

[0046] In a specific embodiment of the present invention, the state of the series connection control component connected to the same PEM electrolyzer module is different from the state of the short-circuit control component. That is to say, when the state of the series connection control component is open, the state of the short-circuit control component is closed; or when the state of the series connection control component is closed, the state of the short-circuit control component is open; and when switching the control of the electrolyzer, in order to ensure the safety of the PEM electrolyzer, the time delay effect ("dead zone") should be considered, that is, after the state of the series connection control component is completely closed, the short-circuit control component can be opened; or after the state of the short-circuit control component is completely closed, the series connection control component can be opened. In other words, the state of the series connection control component connected to the same PEM electrolyzer module and the state of the short-circuit control component are in a different mode.

[0047] Considering that the working current of the PEM electrolyzer module is relatively large, the present invention is implemented by means of copper bars / strips, high-current DC circuit breakers, multiple thick wires (parallel connection to increase the current-carrying capacity), etc.

[0048] In a specific embodiment of the present invention, as shown in Figure 4Both the series connection component and the short - circuit connection component shown are made of semi - I - shaped copper bars and switch elements (the specific connection method is not shown in the figure); in another specific embodiment, both the series connection component and the short - circuit connection component are DC circuit breakers; as other implementation manners, the series connection component is made of a semi - I - shaped copper bar and the short - circuit connection component is a DC circuit breaker; the present invention does not limit the specific implementation manners of the series connection component and the short - circuit connection component.

[0049] In a specific embodiment of the present invention, taking 3 PEM electrolyzer modules, and both the series connection component and the short - circuit connection component being made of semi - I - shaped copper bars as an example, the series connection structure of the electrolyzers in the PEM electrolytic hydrogen production system and its process of controlling hydrogen production are introduced in detail.

[0050] In the lower end plate of each PEM electrolyzer module, pipelines or flow channels are designed, which can transmit the externally input pure water into each single cell. In the upper end plate of the PEM electrolyzer module, two independent pipelines or flow channels are designed. One is used to transmit the oxygen and water generated by the PEM electrolyzer module to the outside of the electrolyzer, and the other transmits the hydrogen and water generated by the PEM electrolyzer module to the outside of the electrolyzer; the two pipelines are independent of each other and are completely physically isolated.

[0051] As Figure 5 shown, the PEM electrolytic hydrogen production system includes three PEM electrolyzer modules, namely PEM electrolyzer module 1, PEM electrolyzer module 2, and PEM electrolyzer module 3.

[0052] Among them, the series connection of PEM electrolyzer module 1 and PEM electrolyzer module 2 is realized through a semi - I - shaped copper bar and series switch k11, and the series connection of PEM electrolyzer module 2 and PEM electrolyzer module 3 is realized through a semi - I - shaped copper bar and series switch k21, that is, the series connection of PEM electrolyzer module 1, PEM electrolyzer module 2, and PEM electrolyzer module 3 is realized through a semi - I - shaped copper bar and series switches k11 and k21.

[0053] Among them, the short - circuit of PEM electrolyzer module 2 is realized through a semi - I - shaped copper bar and short - circuit switch k22. Specifically, the semi - I - shaped copper bar shorts the upper and lower copper buses of PEM electrolyzer module 2 (short - circuits the positive and negative poles of PEM electrolyzer module 2), and the short - circuit of the semi - I - shaped copper bar to PEM electrolyzer module 2 is realized through the control of the short - circuit switch k22, thereby withdrawing PEM electrolyzer module 2 from the electrolyzer PACK.

[0054] Of course, if it is necessary to control the short - circuit of PEM electrolyzer module 3 to realize the function of removing 2 PEM electrolyzer modules (i.e., PEM electrolyzer module 2 and PEM electrolyzer module 3) from the electrolyzer PACK, it is necessary to connect the upper and lower copper buses of PEM electrolyzer module 3 with a semi - I - shaped copper bar (short - circuit the positive and negative poles of PEM electrolyzer module 3).

[0055] In a specific embodiment of the present invention, the semi-I-shaped copper bar and the copper busbars (the positive and negative electrodes of the electrolytic cell) in each PEM electrolytic cell module are fixed by screws.

[0056] Since the cost of the copper bar is low and the manufacturing process of the semi-I-shaped copper bar is simple, the implementation scheme of the series-connected structure of the electrolytic cells will not significantly increase the cost of the PEM electrolytic hydrogen production system, and the mechanical connection method is also reliable, having advantages such as low cost, simplicity, and reliability.

[0057] Embodiment 2

[0058] The present invention also proposes an electrolytic cell management system for a PEM electrolytic hydrogen production system as Figure 6 shown, which is suitable for managing the series-connected structure of the electrolytic cells of the above-mentioned PEM electrolytic hydrogen production system. The electrolytic cell management system includes a plurality of management units EMU, a control unit ECU, and a switch array.

[0059] The switch array is connected to the PEM electrolytic cell module; the switch array is the group control component, and the group control component uses a DC circuit breaker.

[0060] Each management unit EMU is connected to a PEM electrolytic cell module and a group of switch units in the switch array. The management unit EMU collects the state parameters of the corresponding PEM electrolytic cell module, processes the state parameters to generate control instructions to control the switching of the corresponding switch unit in the switch array to realize the withdrawal or entry of the PEM electrolytic cell module from the PEM electrolytic cell module series queue; at the same time, transmits the electrolytic cell PACK parameters of the PEM electrolytic cell module to the control unit.

[0061] The control unit ECU is connected to all management units. The control unit ECU receives the electrolytic cell PACK parameters transmitted by the management unit EMU and realizes the management and control of the PEM electrolytic cell module series queue according to the electrolytic cell PACK parameters.

[0062] The present invention is responsible for the overall management at the PEM electrolytic cell module system level, health status monitoring, the cutting in and out of the electrolytic cell module from the electrolytic cell PACK, the control of the switching of the electrolytic cell module, etc. through the electrolytic cell management system.

[0063] In a specific embodiment of the present invention, the state parameters at least include the voltage of the PEM electrolytic cell module, the current of the PEM electrolytic cell module, the temperature of the PEM electrolytic cell module, the inlet water temperature of the PEM electrolytic cell module, the outlet water temperature of the PEM electrolytic cell module, and the single cell voltage in the PEM electrolytic cell module.

[0064] In a specific embodiment of the present invention, the management unit EMU evaluates the status parameters of the PEM electrolyzer module it is connected to, and determines whether the current PEM electrolyzer module needs to withdraw from or enter the PEM electrolyzer module series queue; if it needs to withdraw from or enter the series queue, the management unit EMU activates the switching switch array ESA to achieve adjustment of the circuit topology.

[0065] In a specific embodiment of the present invention, the management unit EMU implements the switching switch array based on a PLC. As other implementation methods, it is also possible to implement communication with the switch array based on a single chip, DSP, Raspberry Pi, etc.

[0066] In a specific embodiment of the present invention, the control unit ECU receives the electrolyzer PACK parameters transmitted by the management unit EMU, and the specific implementation of controlling the PEM electrolyzer module series queue according to the electrolyzer PACK parameters is as follows:

[0067] When a PEM electrolyzer module enters the PEM electrolyzer module series queue, the control unit ECU automatically changes the PACK parameters of the corresponding PEM electrolyzer, and transmits them to the upper computer through communication or other means to achieve automatic management and control of the electrolyzer PACK; in a specific embodiment of the present invention, the management and control are to increase the PACK rated power parameter and the PACK rated voltage parameter; the present invention does not limit the specific content of the management and control, and can be controlled according to actual needs.

[0068] When a PEM electrolyzer module withdraws from the PEM electrolyzer module series queue, the control unit ECU automatically changes the PACK parameters of the corresponding PEM electrolyzer, and transmits them to the upper computer through communication or other means to achieve automatic management and control of the electrolyzer PACK; in a specific embodiment of the present invention, the management and control are to reduce the PACK rated power parameter and the PACK rated voltage parameter; the present invention does not limit the specific content of the management and control, and can be controlled according to actual needs.

[0069] In a specific embodiment of the present invention, each group of switch units in the array switch includes series switches (k11, k * 1 and kn1) and short - circuit switches (k12, k * 2 and kn2); the series switches are used to connect the PEM electrolyzer module into the PEM electrolyzer module series queue; the break switches are used to enable the PEM electrolyzer module to withdraw from the PEM electrolyzer module series queue.

[0070] In a specific embodiment of the present invention, the switch array is a group - control component using a DC circuit breaker, so both the series switch and the short - circuit switch use DC circuit breakers. More specifically, the series switch is in a normally - closed state, and the short - circuit switch is in a normally - open state.

[0071] In a specific embodiment of the present invention, the series-connected structure of the electrolytic cells of the PEM electrolytic hydrogen production system for electrolytic cell management based on a DC circuit breaker is similar to that of the first embodiment, and is specifically as follows:

[0072] As Figure 7 shown, the electrical connection between the PEM electrolytic cell module 1 and the PEM electrolytic cell module 2 is realized through the DC circuit breaker k11, and the electrical connection between the PEM electrolytic cell module 2 and the PEM electrolytic cell module 3 is realized through the DC circuit breaker k21, that is, the series connection of 3 PEM electrolytic cell modules is realized through the DC circuit breaker k11 and the DC circuit breaker k21; the DC circuit breaker is connected to the copper busbars (the positive and negative electrodes of the electrolytic cell) of the PEM electrolytic cell module through an L-shaped copper busbar (or other shapes), and the L-shaped copper bar and the copper busbars (the positive and negative electrodes of the electrolytic cell) in the PEM electrolytic cell module are fixed by screws.

[0073] As Figure 7 shown, the short circuit of the PEM electrolytic cell module 2 is realized through the DC circuit breaker k22; the DC circuit breaker k22 is connected to the copper busbars (the positive and negative electrodes of the electrolytic cell) of the electrolytic cell module 2 through an L-shaped copper busbar (or other shapes), and the L-shaped copper bar and the copper busbars (the positive and negative electrodes of the electrolytic cell) in the PEM electrolytic cell module 2 are fixed by screws. As another implementation, if it is necessary to increase the short circuit of the PEM electrolytic cell module 3 to realize the function of removing 2 PEM electrolytic cell modules from the electrolytic cell PACK. Then it is necessary for the DC circuit breaker k32 to be connected to the copper busbars (the positive and negative electrodes of the electrolytic cell) in the PEM electrolytic cell module 3 through an L-shaped copper busbar (or other shapes), and the L-shaped copper bar and the copper busbars (the positive and negative electrodes of the electrolytic cell) in the PEM electrolytic cell module 3 are fixed by screws.

[0074] In a specific embodiment of the present invention, the management unit EMU is used to control the states of the DC circuit breakers to realize the exit or entry of each PEM electrolytic cell module in the PEM electrolytic cell queue. More specifically, the management unit EMU1 controls the on-off of the DC circuit breaker k11 (corresponding to the series switch k11), the management unit EMU2 controls the on-off of the DC circuit breaker k21 (corresponding to the series switch k21) and the DC circuit breaker k22 (corresponding to the short-circuit switch k22), and the management unit EMU3 controls the on-off of the DC circuit breaker k32 (corresponding to the short-circuit switch k32).

[0075] The DC circuit breaker of the present invention is controlled by the management unit EMU, which can realize the automatic switching of the electrolytic cell modules, and has the advantages of being real-time, fast, and convenient.

[0076] In summary, the electrolytic cell series connection structure and the electrolytic cell management system of the PEM electrolytic hydrogen production system proposed by the present invention adopt the series PACK flexible grouping method and grouping strategy of stacking PEM electrolytic cell modules up and down, and have the following beneficial effects:

[0077] The PEM electrolytic cell module utilizes the adapter end plate, which is beneficial to the up-and-down stacking of the PEM electrolytic cell module, so as to ensure the consistency of the series connection structure of multiple electrolytic cell modules with the external shape structure of the traditional single electrolytic cell, that is, from the external shape, it still looks like the external shape of an electrolytic cell; in addition, the PEM electrolytic cell module can be controlled to enter or exit the electrolytic cell PACK as needed, so as to realize automatic exit in case of failure; it can also realize automatic matching of the number of electrolytic cells according to the power requirement. Therefore, the present invention can realize the low-cost, stable, efficient and safe operation of the PEM electrolytic water hydrogen production system. Therefore, the present invention effectively overcomes various disadvantages in the prior art and has high industrial utilization value.

[0078] The above embodiments are only illustrative of the principles and effects of the present invention, and are not used to limit the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. The series-connected structure of the electrolyzers in a PEM electrolytic hydrogen production system, characterized in that, It includes at least three PEM electrolyzer modules, a transfer end plate, and a grouping control component; The upper end face of the transfer end plate is fixedly connected to the lower end plate of a PEM electrolyzer module, and the lower end face of the transfer end plate is fixedly connected to the upper end plate of the other PEM electrolyzer module; The grouping control component is connected to the PEM electrolyzer modules, and is used to control whether two adjacent PEM electrolyzer modules are connected in series in the PEM electrolytic hydrogen production system, and control whether any PEM electrolyzer module is short-circuited.

2. The series connection structure of the electrolyzers of the PEM electrolytic hydrogen production system according to claim 1, characterized in that, Holes are formed on the lower end face of the transfer end plate, and the holes and the pressing components arranged on the upper end face of the PEM electrolyzer module form a coupling structure.

3. The series connection structure of the electrolyzers of the PEM electrolytic hydrogen production system according to claim 1, characterized in that, The grouping control component includes a series connection control component and a short-circuit control component; The series connection control component is connected to any two adjacent PEM electrolyzer modules, and is used to control whether the two adjacent PEM electrolyzer modules are connected in series in the PEM electrolytic hydrogen production system; The short-circuit control component is connected to each PEM electrolyzer module, and is used to control whether the PEM electrolyzer module it is connected to is short-circuited.

4. The series-connected group structure of the electrolytic cell of the PEM electrolytic hydrogen production system according to claim 3, characterized in that, The series connection control component includes a plurality of series connection connectors. One end of each series connection connector is connected to the copper bar at the lower end of the PEM electrolyzer module connected to the upper end face of the transfer end plate, and the other end is connected to the copper bar at the upper end of the PEM electrolyzer module connected to the lower end face of the adjacent transfer end plate.

5. The series connection structure of the electrolyzers of the PEM electrolytic hydrogen production system according to claim 3, wherein, The short-circuit control component includes a plurality of short-circuit connectors. One end of each short-circuit connector is connected to the copper bar at the upper end of a PEM electrolyzer module, and the other end is connected to the copper bar at the lower end of a PEM electrolyzer module.

6. The series connection structure of the electrolyzers of the PEM electrolytic hydrogen production system according to claim 3, characterized in that, The states of the series connection control component and the short-circuit control component connected to the same PEM electrolyzer module are different.

7. The series-connected group structure of the electrolytic cell of the PEM electrolytic hydrogen production system according to claim 3, wherein Both the series connection connectors and the short-circuit connectors are semi-I-shaped copper bars.

8. An electrolyzer management system for a PEM electrolysis hydrogen production system, characterized in that, It is applicable to the electrolyzer series grouping structure of the PEM electrolytic hydrogen production system described in any one of claims 1-6. The electrolyzer management system includes a plurality of management units EMU, a control unit ECU, and a switch array; The switch array is connected to the PEM electrolyzer module group; The switch array is the grouping control component, and the grouping control component uses a DC circuit breaker; Each management unit EMU is connected to a PEM electrolyzer module group and a group of switch units in the switch array. The management unit EMU collects the state parameters of the corresponding PEM electrolyzer module group, processes the state parameters to generate control instructions to control the switching of the corresponding switch units in the switch array to enable the PEM electrolyzer module group to withdraw from or enter the PEM electrolyzer module series queue; at the same time, transmits the electrolyzer PACK parameters of the PEM electrolyzer module group to the control unit; The control unit ECU is connected to all management units. The control unit ECU receives the electrolyzer PACK parameters transmitted by the management unit EMU, and realizes the management and control of the PEM electrolyzer module series queue according to the electrolyzer PACK parameters.

9. The electrolyzer management system of the PEM electrolytic hydrogen production system according to claim 8, wherein, The state parameters at least include the PEM electrolyzer module voltage, PEM electrolyzer module current, PEM electrolyzer module temperature, PEM electrolyzer module inlet water temperature, PEM electrolyzer module outlet water temperature, and the single cell voltage in the PEM electrolyzer module.

10. The electrolyzer management system of the PEM electrolytic hydrogen production system according to claim 8, characterized in that, Each group of switch units includes a series switch and a short - circuit switch; the series switch is used to connect the PEM electrolyzer module into the PEM electrolyzer module series queue; the open - circuit switch is used to remove the PEM electrolyzer module from the PEM electrolyzer module series queue.

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