Multi-module fuel cell hydrogen supplementing system

Abstract

The utility model provides a multi-module fuel cell hydrogen supplementing system, which comprises at least two fuel cell modules and a gas storage tank, the at least two fuel cell modules comprise a first electric pile and a second electric pile, the first electric pile and the second electric pile are arranged in parallel, and the gas storage tank is respectively communicated with the first electric pile and the second electric pile; the multi-module fuel cell hydrogen supplementing system further comprises a gas supplementing pipe, the first end of the gas supplementing pipe is communicated with the first electric pile, and the second end of the gas supplementing pipe is communicated with the second electric pile. By arranging the gas supplementing pipe, the hydrogen supply pipelines of the two fuel cell modules can be communicated, so that after one fuel cell module is shut down, the other fuel cell module can supplement hydrogen to the fuel cell module which does not work through the gas supplementing pipe; therefore, the hydrogen pressure in the galvanic pile anode cavity in the fuel cell module which does not work can be maintained at a relatively high level, so that the purpose of preventing air from entering the galvanic pile anode cavity is achieved, the performance of the fuel cell can be improved, and the service life of the fuel cell can be prolonged.

Description

Technical Field

[0001] The present application belongs to the field of hydrogen fuel cell technology, and specifically relates to a multi-module fuel cell hydrogen replenishment system. Background Art

[0002] Hydrogen is considered to be the cleanest energy source. Hydrogen fuel cells are devices that convert chemical energy into electrical energy through a redox reaction using hydrogen as a reducing agent and oxygen or air as an oxidant. Because their products are only water, they have the advantages of being pollution-free and highly efficient, and are being vigorously promoted for use in fixed power generation and vehicle-mounted power generation. However, after the fuel cell system is shut down, the anode cavity of the stack will be in a negative pressure state. At this time, the air in the atmospheric environment will enter the anode cavity of the stack through the tail exhaust pipe or the gap between the single cells of the stack. At the same time, the air in the cathode cavity of the stack will also enter the anode cavity of the stack through the proton exchange membrane, and contact with the residual hydrogen in the anode cavity of the stack to form a hydrogen-air interface, corroding the catalyst and reducing the performance and life of the stack.

[0003] In response to the above problems, Chinese utility model patent CN219591447U discloses a fuel cell tail exhaust pipeline system, a vehicle and a fuel cell testing system, wherein the tail exhaust pipeline system includes a muffler and a fan, wherein the muffler includes a drain pipe and an exhaust pipe, and the drain pipe is connected to the outside; the fan includes an air inlet and an air outlet, the air inlet is connected to the exhaust pipe, and the air outlet is connected to the outside; a drainage bypass is also provided on the side wall of the exhaust pipe, and the drainage bypass is connected to the outside.

[0004] Although the above-mentioned fuel cell tail exhaust pipe system can prevent air from entering the anode cavity of the fuel cell stack from the tail exhaust pipe by setting a fan to protect the combustion cell stack, this technical solution can only prevent air from entering the anode cavity of the fuel cell stack from the tail exhaust pipe, and cannot prevent the air in the cathode cavity of the fuel cell stack from entering the anode cavity of the fuel cell stack through the proton exchange membrane, nor can it prevent air from entering the anode cavity of the fuel cell stack from the gaps between the single cells of the fuel cell stack. Utility Model Content

[0005] Therefore, the technical problem to be solved by the present application is to provide a multi-module battery hydrogen replenishing system, which can replenish hydrogen into the non-working fuel cell modules, thereby preventing air from entering the anode cavity of the fuel cell stack, thereby improving the performance of the fuel cell stack and extending the service life of the fuel cell stack.

[0006] In order to solve the above problems, the present application provides a multi-module fuel cell hydrogen replenishment system, including at least two fuel cell modules and a gas storage tank, at least two of the fuel cell modules include a first fuel cell stack and a second fuel cell stack, the first fuel cell stack and the second fuel cell stack are arranged in parallel, and the gas storage tank is respectively connected to the first fuel cell stack and the second fuel cell stack;

[0007] Wherein, the multi-module fuel cell hydrogen replenishment system also includes an air replenishment pipe, a first end of the air replenishment pipe is connected to the first fuel cell stack, and a second end of the air replenishment pipe is connected to the second fuel cell stack.

[0008] Optionally, the multi-module fuel cell hydrogen replenishment system also includes a distribution unit, which has an inlet, an outlet and a reversing port, the inlet is connected to the gas storage tank, the outlet is connected to the first fuel cell stack, and the reversing port is connected to the first end of the gas replenishment pipe.

[0009] Optionally, the multi-module fuel cell hydrogen replenishing system also includes a first water removal unit and a second water removal unit, the first water removal unit is connected to the first fuel cell stack, and the first water removal unit is arranged on the upstream side of the first fuel cell stack along the flow direction, and the second water removal unit is connected to the second fuel cell stack, and the second water removal unit is arranged on the upstream side of the second fuel cell stack along the flow direction.

[0010] Optionally, the multi-module fuel cell hydrogen replenishing system further includes a first drainage pipeline and a second drainage pipeline, the first drainage pipeline is connected to the drainage port of the first water removal unit, and the second drainage pipeline is connected to the drainage port of the second water removal unit.

[0011] Optionally, the multi-module fuel cell hydrogen replenishing system also includes a first ejector unit and a second ejector unit, the first ejector unit is connected to the first fuel cell stack, and the first ejector unit is arranged on the upstream side of the first water removal unit along the flow path direction, the second ejector unit is connected to the second fuel cell stack, and the second ejector unit is arranged on the upstream side of the second water removal unit along the flow path direction.

[0012] Optionally, the distribution unit is arranged on the downstream side of the first water removal unit along the flow path direction.

[0013] Optionally, the distribution unit is arranged between the first water removal unit and the first ejection unit.

[0014] Optionally, the multi-module fuel cell hydrogen replenishing system also includes a first regulating unit and a second regulating unit, the first end of the first regulating unit is connected to the gas storage tank, and the second end is connected to the first fuel cell stack, the first regulating unit is used to regulate the flow of hydrogen entering the first fuel cell stack, the first end of the second regulating unit is connected to the gas storage tank, and the second end is connected to the second fuel cell stack, and the second regulating unit is used to regulate the flow of hydrogen entering the second fuel cell stack.

[0015] Optionally, the multi-module fuel cell hydrogen replenishing system further includes a first on-off unit and a second on-off unit, wherein the first on-off unit is disposed between the first regulating unit and the gas storage tank, and the second on-off unit is disposed between the second regulating unit and the gas storage tank.

[0016] Optionally, the multi-module fuel cell hydrogen replenishing system further includes a decompression unit, which is connected to the outlet of the gas storage tank and is used to reduce the outlet pressure of the gas storage tank.

[0017] Beneficial Effects

[0018] The multi-module fuel cell hydrogen replenishing system provided in the embodiment of the utility model can connect the hydrogen supply pipelines of two fuel cell modules by arranging an air replenishing pipe. After one fuel cell module is shut down, the other fuel cell module can replenish hydrogen into the non-working fuel cell module through the air replenishing pipe, thereby maintaining the hydrogen pressure in the anode cavity of the stack in the non-working fuel cell module at a high level, that is, ensuring that the anode cavity of the stack in the non-working fuel cell module is in a positive pressure state, so as to achieve the purpose of preventing air from entering the anode cavity of the stack, thereby preventing the residual hydrogen in the anode cavity of the stack from contacting with the air to form a hydrogen-air cross section, thereby improving the performance of the fuel cell and extending the service life of the fuel cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of a multi-module fuel cell hydrogen replenishment system according to an embodiment of the present application.

[0020] The reference numerals are:

[0021] 1. The first battery stack; 2. The first water removal unit; 3. The first drainage pipeline; 4. The first drainage valve; 5. The first ejector unit; 6. The first regulating unit; 7. The first on-off unit; 8. The second battery stack; 9. The second water removal unit; 10. The second drainage pipeline; 11. The second drainage valve; 12. The second ejector unit; 13. The second regulating unit; 14. The second on-off unit; 15. The air supply pipe; 16. The distribution unit; 17. The tail exhaust pipeline; 18. The pressure reducing unit; 19. The air storage tank. DETAILED DESCRIPTION

[0022] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0023] 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 the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0024] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0025] At present, there are many studies on the start-stop strategies of single-module fuel cell systems, and most of them use shutdown purge to delay the formation of hydrogen-air interface. However, after shutdown, the sealing of the hydrogen supply system of the fuel cell stack cannot ensure that the gas is completely leak-proof, so that air will still enter the anode cavity of the fuel cell stack to form a hydrogen-air interface.

[0026] The utility model aims to provide a multi-module battery hydrogen replenishing system for replenishing hydrogen into a non-working fuel cell module, which can prevent air from entering the anode cavity of the battery stack, so as to improve the performance of the battery stack and extend the service life of the battery stack.

[0027] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0028] See also Figure 1As shown, according to an embodiment of the present application, a multi-module fuel cell hydrogen replenishing system is provided, including at least two fuel cell modules and a gas storage tank 19, the at least two fuel cell modules include a first fuel cell stack 1 and a second fuel cell stack 8, the first fuel cell stack 1 and the second fuel cell stack 8 are arranged in parallel, and the gas storage tank 19 is respectively connected to the first fuel cell stack 1 and the second fuel cell stack 8; wherein, the multi-module fuel cell hydrogen replenishing system also includes a gas replenishing pipe 15, a first end of the gas replenishing pipe 15 is connected to the first fuel cell stack 1, and a second end is connected to the second fuel cell stack 8.

[0029] The multi-module fuel cell hydrogen replenishing system provided in the embodiment of the utility model can connect the hydrogen supply pipelines of two fuel cell modules by setting the air replenishing pipe 15, so that after one fuel cell module is shut down, the other fuel cell module can replenish hydrogen into the non-working fuel cell module through the air replenishing pipe 15, thereby maintaining the hydrogen pressure in the anode cavity of the stack in the non-working fuel cell module at a high level, that is, ensuring that the anode cavity of the stack in the non-working fuel cell module is in a positive pressure state, so as to achieve the purpose of preventing air from entering the anode cavity of the stack, and further avoiding the residual hydrogen in the anode cavity of the stack from contacting with air to form a hydrogen-air cross section, which can improve the performance of the fuel cell and extend the service life of the fuel cell.

[0030] The multi-module fuel cell hydrogen replenishment system includes at least two fuel cell modules, and the number of fuel cell modules can be set according to user needs, and this application does not make further restrictions. For example, the number of fuel cell modules can be two, three or four.

[0031] Specifically, the fuel cell module is used to convert chemical energy into electrical energy, and can be applied to fixed power supply or transportation, etc. For example, when the fuel cell module is applied to a fixed power supply, the fixed power supply can provide the user with the required electrical energy; when the fuel cell module is applied to transportation, the fuel cell module can be used as an automobile engine to drive the automobile drive shaft to rotate.

[0032] The at least two fuel cell modules include a first fuel cell module and a second fuel cell module, and the first fuel cell module and the second fuel cell module are arranged in parallel. It can be understood that the first fuel cell module and the second fuel cell module can work simultaneously or independently.

[0033] Among them, the first fuel cell module includes a first battery stack 1, the second fuel cell module includes a second battery stack 8, and the multi-module fuel cell hydrogen replenishment system also includes a gas storage tank 19, and the first battery stack 1 and the second battery stack 8 are respectively connected to the gas storage tank 19. In the embodiment of the present application, the gas storage tank 19 is a high-pressure hydrogen storage tank, which is used to supply hydrogen to the first battery stack 1 and the second battery stack 8 when the first fuel cell module and the second fuel cell module are working.

[0034] Specifically, the multi-module fuel cell hydrogen replenishing system also includes a hydrogen supply main pipe, a first hydrogen supply branch pipe, and a second hydrogen supply branch pipe. In the embodiment of the present application, one end of the hydrogen supply main pipe is connected to the gas storage tank 19, and the other end is connected to the first hydrogen supply branch pipe and the second hydrogen supply branch pipe. Among them, the first gas supply branch pipe is used to connect the first battery stack 1, so that the gas storage tank 19 can supply hydrogen to the first battery stack 1 through the gas supply main pipe and the first gas supply branch pipe when the first fuel cell module is working; the second gas supply branch pipe is used to connect the second battery stack 8, so that the gas storage tank 19 can supply hydrogen to the second battery stack 8 through the gas supply main pipe and the second gas supply branch pipe when the second fuel cell module is working.

[0035] The multi-module fuel cell hydrogen replenishment system further includes an air replenishment pipe 15, a first end of the air replenishment pipe 15 is connected to the first air supply branch pipe, and a second end of the air replenishment pipe 15 is connected to the second air supply branch pipe.

[0036] Specifically, when the first fuel cell module is working and the second fuel cell module is in a shutdown state, the first gas supply branch can ensure the normal operation of the first fuel cell stack 1 while also being able to replenish hydrogen to the second gas supply branch through the gas supply pipe 15, and the hydrogen pressure in the second gas supply branch and the second fuel cell stack 8 can be maintained at a high level for a long time, thereby preventing air from entering the anode cavity of the fuel cell stack of the second fuel cell module and forming a hydrogen-air interface; when the second fuel cell module is working and the first fuel cell module is in a shutdown state, the second gas supply branch can ensure the normal operation of the second fuel cell stack 8 while also being able to replenish hydrogen to the first gas supply branch through the gas supply pipe 15, and the hydrogen pressure in the first gas supply branch and the first fuel cell stack 1 can be maintained at a high level for a long time, thereby preventing air from entering the anode cavity of the fuel cell stack of the first fuel cell module and forming a hydrogen-air interface.

[0037] It is understandable that air entering the anode cavity of the stack will contact the air remaining in the anode cavity of the stack to form a hydrogen-air interface, corrode the carbon carrier, cause platinum to fall off and destroy the three interfaces, so that the battery performance is seriously degraded, and the service life of the battery is also affected. In the present application, by setting the air supply pipe 15 to connect the first air supply branch pipe and the second air supply branch pipe, it can be achieved that after one fuel cell module is shut down, another fuel cell module can replenish hydrogen to the non-working fuel cell module through the air supply pipe 15, so that the hydrogen pressure in the anode cavity of the stack in the non-working fuel cell module can be maintained at a high level, that is, to ensure that the anode cavity of the stack in the non-working fuel cell module is in a positive pressure state, so as to achieve the purpose of preventing air from entering the anode cavity of the stack, and then avoid the residual hydrogen in the anode cavity of the stack from contacting with air to form a hydrogen-air cross section, which can improve the performance of the fuel cell and extend the service life of the fuel cell. Because the anode cavity of the stack in the fuel cell module is in a positive pressure state, air cannot enter the anode cavity of the stack through the tail exhaust pipeline 17, the gap between the proton exchange membrane in the cathode cavity of the stack and the stack single cell.

[0038] In the above embodiment, the multi-module fuel cell hydrogen replenishment system also includes a distribution unit 16, which has an inlet, an outlet and a reversing port. The inlet is connected to the gas storage tank 19, the outlet is connected to the first fuel cell stack 1, and the reversing port is connected to the first end of the gas replenishment pipe 15.

[0039] By providing the distribution unit 16, the user can control the connection state between the first hydrogen supply branch pipe and the second hydrogen supply branch pipe, thereby improving the working stability of the multi-module fuel cell hydrogen replenishing system.

[0040] The distribution unit 16 may be a T-type three-way valve, a spherical three-way valve, a rotary three-way valve, a butterfly three-way valve, etc., which can separate and merge hydrogen, and the present application does not make further restrictions. In the embodiment of the present application, the distribution unit 16 is a T-type three-way valve.

[0041] Among them, the distribution unit 16 is arranged on the first hydrogen supply branch pipe, and the distribution unit 16 has an inlet, an outlet and a reversing port. The inlet and outlet of the distribution unit 16 are both connected to the first hydrogen supply branch pipe, and the reversing port of the distribution unit 16 can be connected to the second hydrogen supply branch pipe through the air supply pipe 15.

[0042] Specifically, the working state of the distribution unit 16 includes a first state and a second state. When the distribution unit 16 is working in the first state, the inlet of the distribution unit 16 is only connected to the outlet, and the first hydrogen supply branch pipe and the second hydrogen supply branch pipe are disconnected; when the distribution unit 16 is working in the second state, the inlet, outlet and reversing port of the distribution unit 16 are interconnected, and the first hydrogen supply branch pipe and the second hydrogen supply branch pipe are connected.

[0043] Among them, when the first fuel cell module and the second fuel cell module are working normally, the distribution unit 16 works in the first state, cutting off the connection between the first hydrogen supply branch and the second hydrogen supply branch; when the first fuel cell module or the second fuel cell module is shut down, the distribution unit 16 works in the second state, connecting the first hydrogen supply branch and the second hydrogen supply branch.

[0044] In some possible embodiments provided by the present disclosure, the multi-module fuel cell hydrogen replenishing system also includes a first water removal unit 2 and a second water removal unit 9, the first water removal unit 2 is connected to the first fuel cell stack 1, and the first water removal unit 2 is arranged on the upstream side of the first fuel cell stack 1 along the flow path direction, and the second water removal unit 9 is connected to the second fuel cell stack 8, and the second water removal unit 9 is arranged on the upstream side of the second fuel cell stack 8 along the flow path direction.

[0045] By providing the first water removal unit 2 and the second water removal unit 9, water in the hydrogen can be filtered out to prevent water from entering the first fuel cell stack 1 and the second fuel cell stack 8 along with the hydrogen, thereby improving the performance of the fuel cell and extending the service life of the fuel cell.

[0046] Among them, the first water removal unit 2 and the second water removal unit 9 are used to separate water from hydrogen, such as a baffle-type gas-water separator, a filler-type gas-water separator or a cyclone-type gas-water separator, etc., and this application does not make further limitations.

[0047] Specifically, the first dehydration unit 2 is arranged on the first hydrogen supply branch pipe, and is used to filter out moisture in the hydrogen entering the first fuel cell 1 through the first hydrogen supply branch pipe; the second dehydration unit 9 is arranged on the second hydrogen supply branch pipe, and is used to filter out moisture in the hydrogen entering the second fuel cell 8 through the second hydrogen supply branch pipe.

[0048] In some possible embodiments provided by the present disclosure, the multi-module fuel cell hydrogen replenishing system also includes a first drainage pipeline 3 and a second drainage pipeline 10, the first drainage pipeline 3 is connected to the drainage port of the first water removal unit 2, and the second drainage pipeline 10 is connected to the drainage port of the second water removal unit 9.

[0049] By providing the first drainage pipe 3 and the second drainage pipe 10 , the water accumulated in the first dewatering unit 2 and the second dewatering unit 9 can be discharged, and the dewatering effect of the first dewatering unit 2 and the second dewatering unit 9 can be improved.

[0050] The multi-module fuel cell hydrogen replenishing system further includes a tail exhaust pipe 17 , which may be an exhaust pipe of a car. The tail exhaust pipe 17 is provided to provide a stable discharge position for water.

[0051] Specifically, the drain outlet of the first water removal unit 2 is connected to the tail drain pipeline 17 through the first drain pipeline 3 , and the drain outlet of the second water removal unit 9 is also connected to the tail drain pipeline 17 through the second drain pipeline 10 .

[0052] The multi-module fuel cell hydrogen replenishing system further includes a first drain valve 4 and a second drain valve 11 . The first drain valve 4 and the second drain valve 11 may be ball valves, gate valves, butterfly valves or solenoid valves.

[0053] Specifically, the first drain valve 4 is disposed on the first drain pipeline 3 to control the on-off of the first drain pipeline 3 ; the second drain valve 11 is disposed on the second drain pipeline 10 to control the on-off of the second drain pipeline 10 .

[0054] In some possible embodiments provided by the present disclosure, the multi-module fuel cell hydrogen replenishing system also includes a first ejector unit 5 and a second ejector unit 12, the first ejector unit 5 is connected to the first fuel cell stack 1, and the first ejector unit 5 is arranged on the upstream side of the first water removal unit 2 along the flow path direction, the second ejector unit 12 is connected to the second fuel cell stack 8, and the second ejector unit 12 is arranged on the upstream side of the second water removal unit 9 along the flow path direction.

[0055] By providing the first ejection unit 5 and the second ejection unit 12, the remaining hydrogen in the first fuel cell stack 1 and the second fuel cell stack 8 can be sucked out and refluxed, and then recombined with the supplied hydrogen and resupplied to the first fuel cell stack 1 and the second fuel cell stack 8, thereby ensuring sufficient flow, achieving a higher anode metering ratio and anti-flooding effect.

[0056] The first ejection unit 5 and the second ejection unit 12 are hydrogen ejectors.

[0057] Specifically, the first ejector unit 5 is arranged on the first hydrogen supply branch pipe and is connected to the first fuel cell stack 1, and the first ejector unit 5 is used to absorb the remaining hydrogen in the first fuel cell stack 1; the second ejector unit 12 is arranged on the second hydrogen supply branch pipe and is connected to the second fuel cell stack 8, and the second ejector unit 12 is used to absorb the remaining hydrogen in the second fuel cell stack 8.

[0058] In the embodiment of the present application, the first ejection unit 5 is disposed on the upstream side of the first water removal unit 2 along the flow path direction; the second ejection unit 12 is disposed on the upstream side of the second water removal unit 9 along the flow path direction.

[0059] In the above embodiment, the distribution unit 16 is disposed on the downstream side of the first water removal unit 2 along the flow path direction.

[0060] Among them, the distribution unit 16 is arranged on the downstream side of the first dehydration unit 2 along the flow direction, that is, the position where the first end of the air supply pipe 15 is connected with the first hydrogen supply branch pipe is located on the downstream side of the first dehydration unit 2 along the flow direction, and at this time, the position where the second end of the air supply pipe 15 is connected with the second hydrogen supply branch pipe is located on the downstream side of the second dehydration unit 9 along the flow direction.

[0061] Specifically, by arranging a distribution unit 16 on the downstream side of the first dehydration unit 2 along the flow path direction, the first hydrogen supply branch pipe can replenish the dehydrated hydrogen to the second hydrogen supply branch pipe through the gas replenishment pipe 15, which can improve the performance of the fuel cell and extend the service life of the fuel cell.

[0062] In addition, the allocation unit 16 may also have the following configuration:

[0063] The distribution unit 16 is disposed between the first water removal unit 2 and the first ejection unit 5 .

[0064] Among them, the distribution unit 16 is arranged between the first dehydration unit 2 and the first ejection unit 5, that is, the position where the first end of the air supply pipe 15 is connected to the first hydrogen supply branch pipe is located between the first dehydration unit 2 and the first ejection unit 5, and at this time, the position where the second end of the air supply pipe 15 is connected to the second hydrogen supply branch pipe is located between the second dehydration unit 9 and the second ejection unit 12.

[0065] In some possible embodiments provided by the present disclosure, the multi-module fuel cell hydrogen replenishing system also includes a first regulating unit 6 and a second regulating unit 13. The first end of the first regulating unit 6 is connected to the gas storage tank 19, and the second end is connected to the first fuel cell stack 1. The first regulating unit 6 is used to regulate the flow of hydrogen entering the first fuel cell stack 1. The first end of the second regulating unit 13 is connected to the gas storage tank 19, and the second end is connected to the second fuel cell stack 8. The second regulating unit 13 is used to regulate the flow of hydrogen entering the second fuel cell stack 8.

[0066] By providing the first regulating unit 6 and the second regulating unit 13 to respectively regulate the hydrogen flow rates entering the first fuel cell stack 1 and the second fuel cell stack 8 , the stability of the multi-module fuel cell hydrogen replenishing system can be improved so that the fuel cells can operate normally.

[0067] The first regulating unit 6 and the second regulating unit 13 may be proportional valves, and the opening of the proportional valves is adjustable.

[0068] Specifically, the first regulating unit 6 is arranged on the first hydrogen supply branch pipe, and the hydrogen flow entering the first fuel cell 1 can be controlled by adjusting the opening of the first regulating unit 6 to ensure that the first fuel cell 1 can operate normally; the second regulating unit 13 is arranged on the second hydrogen supply branch pipe, and the hydrogen flow entering the second fuel cell 8 can be controlled by adjusting the opening of the second regulating unit 13 to ensure that the second fuel cell 8 can operate normally.

[0069] It can be understood that by setting the first regulating unit 6 and the second regulating unit 13, the hydrogen flow through the air supply pipe 15 can be controlled, and the hydrogen pressure in the second gas supply branch pipe and the second fuel cell stack 8 can be maintained at a high level for a long time, thereby preventing air from entering the anode cavity of the second fuel cell module to form a hydrogen-air interface.

[0070] In some possible embodiments provided by the present disclosure, the multi-module fuel cell hydrogen replenishing system also includes a first on-off unit 7 and a second on-off unit 14, the first on-off unit 7 is arranged between the first regulating unit 6 and the gas storage tank 19, and the second on-off unit 14 is arranged between the second regulating unit 13 and the gas storage tank 19.

[0071] By providing the first on-off unit 7 and the second on-off unit 14, the on-off state of the first hydrogen supply branch pipe and the second hydrogen supply branch pipe can be controlled, thereby improving the working stability of the multi-module fuel cell hydrogen replenishing system.

[0072] The first on-off unit 7 and the second on-off unit 14 may be ball valves, gate valves, butterfly valves or solenoid valves, etc. In the embodiment of the present application, the first on-off unit 7 and the second on-off unit 14 are solenoid valves, which can improve the automation of the multi-module fuel cell hydrogen replenishment system.

[0073] Specifically, the first on-off unit 7 is provided on the first hydrogen supply branch pipe, and is used to control the on-off state of the first hydrogen supply branch pipe; the second on-off unit 14 is provided on the second hydrogen supply branch pipe, and is used to control the on-off state of the second hydrogen supply branch pipe.

[0074] The first on-off unit 7 is disposed on the upstream side of the first regulating unit 6 along the flow path direction; the second on-off unit 14 is disposed on the upstream side of the second regulating unit 13 along the flow path direction.

[0075] In some possible embodiments provided by the present disclosure, the multi-module fuel cell hydrogen replenishing system further includes a decompression unit 18 , which is connected to the outlet of the gas storage tank 19 and is used to reduce the outlet pressure of the gas storage tank 19 .

[0076] By providing the decompression unit 18 and connecting the decompression unit 18 with the outlet of the gas storage tank 19 , the exhaust pressure of the gas storage tank 19 can be reduced, so as to improve the working stability of the multi-module fuel cell hydrogen replenishment system.

[0077] The pressure reducing unit 18 may be a pressure reducing valve or the like.

[0078] Specifically, the decompression unit 18 is disposed on the hydrogen supply main pipe, and the decompression unit 18 is connected to the outlet of the gas storage tank 19 so that the hydrogen discharged from the gas storage tank 19 can enter the first hydrogen supply branch pipe and the second hydrogen supply branch pipe only after passing through the decompression unit 18 .

[0079] The multi-module fuel cell hydrogen replenishing system provided in the embodiment of the utility model can connect the hydrogen supply pipelines of two fuel cell modules by setting the air replenishing pipe 15, so that after one fuel cell module is shut down, the other fuel cell module can replenish hydrogen into the non-working fuel cell module through the air replenishing pipe 15, thereby maintaining the hydrogen pressure in the anode cavity of the stack in the non-working fuel cell module at a high level, that is, ensuring that the anode cavity of the stack in the non-working fuel cell module is in a positive pressure state, so as to achieve the purpose of preventing air from entering the anode cavity of the stack, and further avoiding the residual hydrogen in the anode cavity of the stack from contacting with air to form a hydrogen-air cross section, which can improve the performance of the fuel cell and extend the service life of the fuel cell.

[0080] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0081] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application. The above are only preferred implementations of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present application, and these improvements and variations should also be regarded as the protection scope of the present application.

Claims

1. A multi-module fuel cell hydrogen replenishment system, characterized in that: Comprising at least two fuel cell modules and a gas storage tank (19), wherein at least two of the fuel cell modules comprise a first fuel cell stack (1) and a second fuel cell stack (8), wherein the first fuel cell stack (1) and the second fuel cell stack (8) are arranged in parallel, and the gas storage tank (19) is respectively connected to the first fuel cell stack (1) and the second fuel cell stack (8); The multi-module fuel cell hydrogen replenishment system further comprises an air replenishment pipe (15), a first end of the air replenishment pipe (15) being connected to the first fuel cell stack (1), and a second end of the air replenishment pipe (15) being connected to the second fuel cell stack (8).

2. The multi-module fuel cell hydrogen replenishment system according to claim 1, characterized in that: The multi-module fuel cell hydrogen replenishment system also includes a distribution unit (16), the distribution unit (16) having an inlet, an outlet and a reversing port, the inlet being connected to the gas storage tank (19), the outlet being connected to the first fuel cell stack (1), and the reversing port being connected to the first end of the gas replenishment pipe (15).

3. The multi-module fuel cell hydrogen replenishment system according to claim 2, characterized in that: The multi-module fuel cell hydrogen replenishing system further comprises a first dehydration unit (2) and a second dehydration unit (9), wherein the first dehydration unit (2) is connected to the first fuel cell stack (1), and the first dehydration unit (2) is arranged on the upstream side of the first fuel cell stack (1) along the flow path direction, and the second dehydration unit (9) is connected to the second fuel cell stack (8), and the second dehydration unit (9) is arranged on the upstream side of the second fuel cell stack (8) along the flow path direction.

4. The multi-module fuel cell hydrogen replenishment system according to claim 3, characterized in that: The multi-module fuel cell hydrogen replenishing system further comprises a first drainage pipeline (3) and a second drainage pipeline (10), wherein the first drainage pipeline (3) is connected to the drainage outlet of the first water removal unit (2), and the second drainage pipeline (10) is connected to the drainage outlet of the second water removal unit (9).

5. The multi-module fuel cell hydrogen replenishment system according to claim 3, characterized in that: The multi-module fuel cell hydrogen replenishing system further comprises a first ejector unit (5) and a second ejector unit (12), wherein the first ejector unit (5) is connected to the first fuel cell stack (1), and the first ejector unit (5) is arranged on the upstream side of the first water removal unit (2) along the flow path direction, and the second ejector unit (12) is connected to the second fuel cell stack (8), and the second ejector unit (12) is arranged on the upstream side of the second water removal unit (9) along the flow path direction.

6. The multi-module fuel cell hydrogen replenishment system according to claim 5, characterized in that: The distribution unit (16) is arranged on the downstream side of the first water removal unit (2) along the flow path direction.

7. The multi-module fuel cell hydrogen replenishment system according to claim 5, characterized in that: The distribution unit (16) is arranged between the first water removal unit (2) and the first ejection unit (5).

8. The multi-module fuel cell hydrogen replenishment system according to claim 1, characterized in that: The multi-module fuel cell hydrogen replenishing system further comprises a first regulating unit (6) and a second regulating unit (13); a first end of the first regulating unit (6) is connected to the gas storage tank (19), and a second end is connected to the first fuel cell stack (1); the first regulating unit (6) is used to regulate the flow of hydrogen entering the first fuel cell stack (1); a first end of the second regulating unit (13) is connected to the gas storage tank (19), and a second end is connected to the second fuel cell stack (8); the second regulating unit (13) is used to regulate the flow of hydrogen entering the second fuel cell stack (8).

9. The multi-module fuel cell hydrogen replenishment system according to claim 8, characterized in that: The multi-module fuel cell hydrogen replenishing system further comprises a first on-off unit (7) and a second on-off unit (14), wherein the first on-off unit (7) is arranged between the first regulating unit (6) and the gas storage tank (19), and the second on-off unit (14) is arranged between the second regulating unit (13) and the gas storage tank (19).

10. The multi-module fuel cell hydrogen replenishment system according to claim 1, characterized in that: The multi-module fuel cell hydrogen replenishment system further comprises a decompression unit (18), wherein the decompression unit (18) is connected to the outlet of the gas storage tank (19) and is used to reduce the outlet pressure of the gas storage tank (19).

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