CN222146291U - Multi-module fuel cell hydrogen supplementing system - Google Patents

Abstract

The application provides a multi-module fuel cell hydrogen supplementing system which comprises at least two fuel cell modules and an air storage tank, wherein 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, the air 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 an air supplementing pipe, a first end of the air supplementing pipe is communicated with the first electric pile, and a second end of the air supplementing pipe is communicated with the second electric pile. Through setting up the hydrogen supply pipeline that the moisturizing pipe can communicate two fuel cell module, can realize that after the shut down of a fuel cell module, another fuel cell module can supply hydrogen to the fuel cell module that does not work through the moisturizing pipe to can maintain the hydrogen pressure in the electric pile positive pole chamber in the fuel cell module that does not work at higher level, in order to realize hindering the purpose that air got into electric pile positive pole chamber, can improve fuel cell's performance and prolong fuel cell's life.

Description

Multi-module fuel cell hydrogen supplementing system

Technical Field

The application belongs to the technical field of hydrogen fuel cells, and particularly relates to a hydrogen supplementing system of a multi-module fuel cell.

Background

Hydrogen is considered as the cleanest energy source, and a hydrogen fuel cell is a device for converting chemical energy into electric energy by oxidation-reduction reaction with hydrogen as a reducing agent and oxygen or air as an oxidizing agent, and has the advantages of no pollution and high efficiency because only water is contained in the product, so that the hydrogen fuel cell is greatly popularized and applied to stationary power generation and vehicle-mounted power generation. However, after the fuel cell system is shut down, the inside of the anode cavity of the electric pile is in a negative pressure state, at this time, air in the atmosphere can enter the anode cavity of the electric pile through a tail exhaust pipeline or gaps among single cells of the electric pile, and meanwhile, air in the cathode cavity of the electric pile can enter the anode cavity of the electric pile through a proton exchange membrane and contact with residual hydrogen in the anode cavity of the electric pile to form a hydrogen air interface, so that the catalyst is corroded, and the performance and the service life of the electric pile are reduced.

Aiming at the problems, the Chinese patent No. 219591447U discloses a tail exhaust pipe system of a fuel cell, a vehicle and a fuel cell testing system, wherein the tail exhaust pipe system comprises a silencer and a fan, the silencer comprises a drain pipe and an exhaust pipe, the drain pipe is communicated with the outside, the fan comprises an air inlet and an air outlet, the air inlet is communicated with the exhaust pipe, the air outlet is communicated with the outside, and a drain bypass is further arranged on the side wall of the exhaust pipe and is communicated with the outside.

Although the tail exhaust pipeline system of the fuel cell can prevent air from entering the anode cavity of the electric pile from the tail exhaust pipeline by arranging the fan so as to protect the combustion cell pile, the technical scheme can only prevent air from entering the anode cavity of the electric pile from the tail exhaust pipeline, and cannot avoid that air in the cathode cavity of the electric pile also enters the anode cavity of the electric pile through the proton exchange membrane and air enters the anode cavity of the electric pile from gaps among single cells of the electric pile.

Disclosure of utility model

Therefore, the technical problem to be solved by the application is to provide a multi-module battery hydrogen supplementing system which can supplement hydrogen to an unoperated fuel cell module and can realize the purpose of blocking air from entering an anode cavity of a galvanic pile, thereby improving the performance of the galvanic pile and prolonging the service life of the galvanic pile.

In order to solve the above problems, the present application provides a multi-module fuel cell hydrogen supplementing system, which comprises at least two fuel cell modules and a gas storage tank, wherein 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 hydrogen supplementing system of the multi-module fuel cell further comprises a gas supplementing pipe, wherein 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.

Optionally, the multi-module fuel cell hydrogen supplementing system further comprises a distribution unit, wherein the distribution unit is provided with an inlet, an outlet and a reversing port, the inlet is communicated with the air storage tank, the outlet is communicated with the first electric pile, and the reversing port is communicated with the first end of the gas supplementing pipe.

Optionally, the multi-module hydrogen supplementing system further includes a first water removing unit and a second water removing unit, the first water removing unit is communicated with the first electric pile, the first water removing unit is disposed on an upstream side of the first electric pile along a flow path direction, the second water removing unit is communicated with the second electric pile, and the second water removing unit is disposed on an upstream side of the second electric pile along the flow path direction.

Optionally, the multi-module fuel cell hydrogen supplementing system further comprises a first drainage pipeline and a second drainage pipeline, wherein the first drainage pipeline is communicated with the drainage port of the first water removing unit, and the second drainage pipeline is communicated with the drainage port of the second water removing unit.

Optionally, the hydrogen supplementing system of the multi-module fuel cell further comprises a first injection unit and a second injection unit, wherein the first injection unit is communicated with the first galvanic pile, the first injection unit is arranged on the upstream side of the first water removing unit along the flow path direction, the second injection unit is communicated with the second galvanic pile, and the second injection unit is arranged on the upstream side of the second water removing unit along the flow path direction.

Optionally, the distribution unit is disposed on a downstream side of the first water removal unit in the flow path direction.

Optionally, the distribution unit is disposed between the first water removal unit and the first injection unit.

Optionally, the multi-module fuel cell hydrogen supplementing system further includes a first adjusting unit and a second adjusting unit, the first end of the first adjusting unit is communicated with the air storage tank, the second end of the first adjusting unit is communicated with the first electric pile, the first adjusting unit is used for adjusting the hydrogen flow entering the first electric pile, the first end of the second adjusting unit is communicated with the air storage tank, the second end of the second adjusting unit is communicated with the second electric pile, and the second adjusting unit is used for adjusting the hydrogen flow entering the second electric pile.

Optionally, the multi-module fuel cell hydrogen supplementing system further comprises a first on-off unit and a second on-off unit, wherein the first on-off unit is arranged between the first adjusting unit and the air storage tank, and the second on-off unit is arranged between the second adjusting unit and the air storage tank.

Optionally, the multi-module fuel cell hydrogen supplementing system further comprises a decompression unit, wherein the decompression unit is communicated with the outlet of the gas storage tank and is used for reducing the outlet pressure of the gas storage tank.

Advantageous effects

According to the multi-module fuel cell hydrogen supplementing system provided by the embodiment of the utility model, the hydrogen supplying pipelines of the two fuel cell modules can be communicated through the gas supplementing pipe, so that after one fuel cell module is stopped, the other fuel cell module can supplement hydrogen to the non-working fuel cell module through the gas supplementing pipe, and therefore, the hydrogen pressure in the anode cavity of the electric pile in the non-working fuel cell module can be maintained at a higher level, namely, the anode cavity of the electric pile in the non-working fuel cell module is ensured to be in a positive pressure state, the purpose of blocking air from entering the anode cavity of the electric pile is realized, and further, the hydrogen air cross section formed by the contact of residual hydrogen in the anode cavity of the electric pile and the air can be avoided, the performance of the fuel cell can be improved, and the service life of the fuel cell can be prolonged.

Drawings

Fig. 1 is a schematic structural diagram of a multi-module fuel cell hydrogen supplementing system according to an embodiment of the present application.

The reference numerals are expressed as:

1. A first galvanic pile; 2, a first water removing unit; the device comprises a first drainage pipeline, a first drainage valve, a first injection unit, a first regulation unit, a first on-off unit, a first electric pile, a second dewatering unit, a second drainage pipeline, a second drainage valve, a second injection unit, a second regulation unit, a second on-off unit, a gas supplementing pipe, a distribution unit, a tail discharge pipeline, a pressure reduction unit, a gas storage tank and a gas storage tank.

Detailed Description

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected via an intervening medium, or in communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

At present, a start-stop strategy of a single-module fuel cell system is studied more, a shutdown purging mode is adopted to delay the formation of a hydrogen air interface, but after shutdown, the tightness of a hydrogen supply system of a galvanic pile cannot meet the condition that gas is not leaked completely, so that air still enters an anode cavity of the galvanic pile to form the hydrogen air interface.

The utility model aims to provide a multi-module battery hydrogen supplementing system for supplementing hydrogen to an unoperated fuel cell module, which can prevent air from entering an anode cavity of a pile so as to improve the performance of the pile and prolong the service life of the pile.

The preferred embodiments of the present utility model will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present utility model only, and are not intended to limit the present utility model.

Referring to fig. 1, according to an embodiment of the present application, there is provided a multi-module fuel cell hydrogen supplementing system, including at least two fuel cell modules and a gas storage tank 19, wherein the at least two fuel cell modules include a first cell stack 1 and a second cell stack 8, the first cell stack 1 is disposed in parallel with the second cell stack 8, the gas storage tank 19 is respectively communicated with the first cell stack 1 and the second cell stack 8, and the multi-module fuel cell hydrogen supplementing system further includes a gas supplementing pipe 15, a first end of the gas supplementing pipe 15 is communicated with the first cell stack 1, and a second end of the gas supplementing pipe is communicated with the second cell stack 8.

According to the multi-module fuel cell hydrogen supplementing system provided by the embodiment of the utility model, the hydrogen supplying pipelines of the two fuel cell modules can be communicated through the air supplementing pipe 15, so that after one fuel cell module is stopped, the other fuel cell module can supplement hydrogen to the non-working fuel cell module through the air supplementing pipe 15, and therefore the hydrogen pressure in the anode cavity of the electric pile in the non-working fuel cell module can be maintained at a higher level, namely, the anode cavity of the electric pile in the non-working fuel cell module is ensured to be in a positive pressure state, the purpose of blocking air from entering the anode cavity of the electric pile is realized, and further, the hydrogen air cross section formed by the contact of residual hydrogen in the anode cavity of the electric pile and the air can be avoided, the performance of the fuel cell can be improved, and the service life of the fuel cell can be prolonged.

The multi-module fuel cell hydrogen supplementing system comprises at least two fuel cell modules, the number of the fuel cell modules can be set according to the requirements of users, and the application is not limited further. For example, the number of fuel cell modules may be two, three, four, or the like.

In particular, the fuel cell module is used for converting chemical energy into electric energy, and can be applied to a fixed power supply, transportation, and the like. For example, when the fuel cell module is applied to a stationary power source, the stationary power source can provide the user with electric energy required for use, and when the fuel cell module is applied to transportation, the fuel cell module can serve as an automobile engine to drive an automobile transmission shaft to rotate.

The at least two fuel cell modules comprise 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 is understood that the first fuel cell module and the second fuel cell module may operate simultaneously or separately.

The first fuel cell module comprises a first electric pile 1, the second fuel cell module comprises a second electric pile 8, the multi-module fuel cell hydrogen supplementing system further comprises a gas storage tank 19, and the first electric pile 1 and the second electric pile 8 are respectively communicated with the gas storage tank 19. In the embodiment of the present application, the gas storage tank 19 is a high-pressure hydrogen storage tank for supplying hydrogen to the first and second stacks 1 and 8 when the first and second fuel cell modules are operated.

Specifically, the multi-module fuel cell hydrogen supplementing system further comprises a hydrogen supply main pipe, a first hydrogen supply branch pipe and a second hydrogen supply branch pipe. In the embodiment of the application, one end of the hydrogen supply main pipe is communicated with the gas storage tank 19, and the other end is communicated with the first hydrogen supply branch pipe and the second hydrogen supply branch pipe. The first gas supply branch pipe is used for communicating with the first electric pile 1 so that the gas storage tank 19 can supply hydrogen to the first electric pile 1 through the gas supply main pipe and the first gas supply branch pipe when the first fuel cell module works, and the second gas supply branch pipe is used for communicating with the second electric pile 8 so that the gas storage tank 19 can supply hydrogen to the second electric pile 8 through the gas supply main pipe and the second gas supply branch pipe when the second fuel cell module works.

The multi-module fuel cell hydrogen supplementing system further comprises a gas supplementing pipe 15, a first end of the gas supplementing pipe 15 is communicated with the first gas supply branch pipe, and a second section of the gas supplementing pipe is communicated with the second gas supply branch pipe.

Specifically, when the first fuel cell module works and the second fuel cell module is in a shutdown state, the first air supply branch pipe can perform hydrogen supplementing operation to the second air supply branch pipe through the air supplementing pipe 15 while ensuring that the first electric pile 1 works normally, the hydrogen pressure in the second air supply branch pipe and the second electric pile 8 can be maintained at a higher level for a long time, so that air can be prevented from entering the anode cavity of the electric pile of the second fuel cell module to form a hydrogen air interface, when the second fuel cell module works and the first fuel cell module is in the shutdown state, the second air supply branch pipe can perform hydrogen supplementing operation to the first air supply branch pipe through the air supplementing pipe 15 while ensuring that the second electric pile 8 works normally, and the hydrogen pressure in the first air supply branch pipe and the first electric pile 1 can be maintained at a higher level for a long time, so that the air can be prevented from entering the anode cavity of the electric pile of the first fuel cell module to form the hydrogen air interface.

It will be appreciated that air entering the anode cavity of the stack will contact with the air remaining in the anode cavity of the stack to form a hydrogen-air interface, and corrosion of the carbon carrier causes platinum to fall off and damage the three interfaces, so that the performance of the battery is severely degraded, and the service life of the battery is also affected. In the application, the first air supply branch pipe and the second air supply branch pipe can be communicated through the air supplementing pipe 15, so that after one fuel cell module is stopped, the other fuel cell module can supplement hydrogen to the fuel cell module which does not work through the air supplementing pipe 15, thereby maintaining the hydrogen pressure in the anode cavity of the electric pile in the fuel cell module which does not work at a higher level, namely ensuring that the anode cavity of the electric pile in the fuel cell module which does not work is in a positive pressure state, so as to realize the aim of preventing air from entering the anode cavity of the electric pile, further avoiding the contact of residual hydrogen in the anode cavity of the electric pile with the air to form a hydrogen air section, improving the performance of the fuel cell and prolonging the service life of the fuel cell. Because the anode cavity of the electric pile in the fuel cell module is in a positive pressure state, air cannot enter the anode cavity of the electric pile through the tail exhaust pipe 17, the proton exchange membrane in the cathode cavity of the electric pile and gaps among the single cells of the electric pile.

In the above embodiment, the multi-module fuel cell hydrogen supplementing system further includes the distribution unit 16, the distribution unit 16 having an inlet, an outlet, and a reversing port, the inlet being in communication with the air tank 19, the outlet being in communication with the first stack 1, and the reversing port being in communication with the first end of the gas supplementing pipe 15.

By providing the distribution unit 16 so that the user can control the communication state of the first hydrogen supply branch pipe and the second hydrogen supply branch pipe, the stability of the operation of the multi-module fuel cell hydrogen supplementing system can be improved.

The distribution unit 16 may be a T-type three-way valve, a ball-type three-way valve, a rotary three-way valve, a butterfly three-way valve, or the like, and may be capable of splitting and converging hydrogen, which is not limited in the present application. In the present embodiment, the distribution unit 16 is a T-shaped three-way valve.

Wherein, the distribution unit 16 is arranged on the first hydrogen supply branch pipe, the distribution unit 16 is provided with an inlet, an outlet and a reversing port, the inlet and the outlet of the distribution unit 16 are communicated with the first hydrogen supply branch pipe, and the reversing port of the distribution unit 16 can be communicated with the second hydrogen supply branch pipe through the air supplementing pipe 15.

Specifically, the operating states of the distribution unit 16 include a first state and a second state, when the distribution unit 16 is in the first state, the inlet of the distribution unit 16 is only communicated with the outlet, and the first hydrogen supply branch pipe and the second hydrogen supply branch pipe are disconnected, and when the distribution unit 16 is in the second state, the inlet, the outlet and the reversing port of the distribution unit 16 are mutually communicated, and the first hydrogen supply branch pipe and the second hydrogen supply branch pipe are communicated.

When the first fuel cell module or the second fuel cell module is stopped, the distribution unit 16 is in the second state to work and communicate the first hydrogen supply branch pipe and the second hydrogen supply branch pipe.

In some possible embodiments provided by the present disclosure, the multi-module fuel cell hydrogen supplementing system further includes a first water removal unit 2 and a second water removal unit 9, the first water removal unit 2 is communicated with the first electric pile 1, the first water removal unit 2 is disposed on an upstream side of the first electric pile 1 along a flow path direction, the second water removal unit 9 is communicated with the second electric pile 8, and the second water removal unit 9 is disposed on an upstream side of the second electric pile 8 along the flow path direction.

By arranging the first water removing unit 2 and the second water removing unit 9, water in the hydrogen can be filtered, so that the water is prevented from entering the first electric pile 1 and the second electric pile 8 along with the hydrogen, the performance of the fuel cell can be improved, and the service life of the fuel cell can be prolonged.

The first water removing unit 2 and the second water removing unit 9 are used for separating water in hydrogen, such as a separator type gas-water separator, a filler type gas-water separator or a cyclone type gas-water separator, and the application is not limited further.

Specifically, the first water removing unit 2 is arranged on the first hydrogen supply branch pipe and is used for filtering water in the hydrogen entering the first electric pile 1 through the first hydrogen supply branch pipe, and the second water removing unit 9 is arranged on the second hydrogen supply branch pipe and is used for filtering water in the hydrogen entering the second electric pile 8 through the second hydrogen supply branch pipe.

In some possible embodiments provided by the present disclosure, the multi-module fuel cell hydrogen supplementing system further comprises a first drain line 3 and a second drain line 10, the first drain line 3 being in communication with the drain port of the first water removal unit 2, the second drain line 10 being in communication with the drain port of the second water removal unit 9.

The water accumulated in the first water removing unit 2 and the second water removing unit 9 can be discharged by arranging the first water discharging pipeline 3 and the second water discharging pipeline 10, so that the water removing effect of the first water removing unit 2 and the second water removing unit 9 can be improved.

The multi-module fuel cell hydrogen supplementing system further comprises a tail exhaust pipeline 17, wherein the tail exhaust pipeline 17 can be an exhaust pipe of an automobile, and a stable exhaust position is provided for moisture through the arrangement of the tail exhaust pipeline 17.

Specifically, the drain port of the first water removal unit 2 is communicated with the tail drain pipe 17 through the first drain pipe 3, and the drain port of the second water removal unit 9 is also communicated with the tail drain pipe 17 through the second drain pipe 10.

The multi-module fuel cell hydrogen supplementing system further comprises a first drainage valve 4 and a second drainage valve 11, wherein the first drainage valve 4 and the second drainage valve 11 can be ball valves, gate valves, butterfly valves, electromagnetic valves or the like.

Specifically, the first drain valve 4 is arranged on the first drain pipeline 3 and used for controlling the on-off of the first drain pipeline 3, and the second drain valve 11 is arranged on the second drain pipeline 10 and used for controlling the on-off of the second drain pipeline 10.

In some possible embodiments provided by the present disclosure, the multi-module fuel cell hydrogen supplementing system further includes a first injection unit 5 and a second injection unit 12, where the first injection unit 5 is connected to the first stack 1, the first injection unit 5 is disposed on an upstream side of the first water removal unit 2 along the flow path direction, the second injection unit 12 is connected to the second stack 8, and the second injection unit 12 is disposed on an upstream side of the second water removal unit 9 along the flow path direction.

By arranging the first injection unit 5 and the second injection unit 12, residual hydrogen in the first electric pile 1 and the second electric pile 8 can be sucked and refluxed, and the residual hydrogen is supplied to the first electric pile 1 and the second electric pile 8 again after being converged with the supplied hydrogen, so that sufficient flow can be ensured, and a higher anode metering ratio and a waterproof flooding effect can be achieved.

Wherein the first injection unit 5 and the second injection unit 12 are hydrogen ejectors.

Specifically, the first injection unit 5 is arranged on the first hydrogen supply branch pipe and is communicated with the first electric pile 1, the first injection unit 5 is used for sucking out residual hydrogen reacted in the first electric pile 1, the second injection unit 12 is arranged on the second hydrogen supply branch pipe and is communicated with the second electric pile 8, and the second injection unit 12 is used for sucking out residual hydrogen reacted in the second electric pile 8.

In the embodiment of the application, the first injection unit 5 is arranged on the upstream side of the first water removal unit 2 along the flow path direction, and the second injection unit 12 is arranged on the upstream side of the second water removal unit 9 along the flow path direction.

In the above embodiment, the distribution unit 16 is provided on the downstream side of the first water removal unit 2 in the flow path direction.

The distribution unit 16 is disposed on a downstream side of the first water removing unit 2 in the flow path direction, that is, a position where the first end of the air compensating pipe 15 is communicated with the first hydrogen supplying branch pipe is located on a downstream side of the first water removing unit 2 in the flow path direction, and a position where the second end of the air compensating pipe 15 is communicated with the second hydrogen supplying branch pipe is located on a downstream side of the second water removing unit 9 in the flow path direction.

Specifically, by providing the distribution unit 16 on the downstream side of the first water removal unit 2 in the flow path direction so that the first hydrogen supply branch pipe can supply the dehydrated hydrogen to the second hydrogen supply branch pipe through the gas supply pipe 15, the performance of the fuel cell can be improved and the service life of the fuel cell can be prolonged.

Furthermore, the distribution unit 16 may be arranged as follows:

The distribution unit 16 is arranged between the first water removal unit 2 and the first injection unit 5.

Wherein, the distribution unit 16 is arranged between the first water removing unit 2 and the first injection unit 5, that is, the position where the first end of the air supplementing pipe 15 is communicated with the first hydrogen supply branch pipe is located between the first water removing unit 2 and the first injection unit 5, and the position where the second end of the air supplementing pipe 15 is communicated with the second hydrogen supply branch pipe is located between the second water removing unit 9 and the second injection unit 12.

In some possible embodiments provided by the present disclosure, the multi-module fuel cell hydrogen supplementing system further includes a first adjusting unit 6 and a second adjusting unit 13, a first end of the first adjusting unit 6 is communicated with the gas storage tank 19, a second end of the first adjusting unit is communicated with the first electric pile 1, the first adjusting unit 6 is used for adjusting the hydrogen flow entering the first electric pile 1, a first end of the second adjusting unit 13 is communicated with the gas storage tank 19, a second end of the second adjusting unit is communicated with the second electric pile 8, and the second adjusting unit 13 is used for adjusting the hydrogen flow entering the second electric pile 8.

By arranging the first adjusting unit 6 and the second adjusting unit 13, the flow of the hydrogen entering the first electric pile 1 and the flow of the hydrogen entering the second electric pile 8 can be respectively adjusted, and the working stability of the hydrogen supplementing system of the multi-module fuel cell can be improved, so that the fuel cell can normally operate.

The first adjusting unit 6 and the second adjusting unit 13 may be proportional valves, and the opening degree of the proportional valves may be adjustable.

Specifically, the first adjusting unit 6 is arranged on the first hydrogen supply branch pipe, the flow of hydrogen entering the first electric pile 1 can be controlled by adjusting the opening of the first adjusting unit 6 so as to ensure that the first electric pile 1 can normally operate, and the second adjusting unit 13 is arranged on the second hydrogen supply branch pipe, and the flow of hydrogen entering the second electric pile 8 can be controlled by adjusting the opening of the second adjusting unit 13 so as to ensure that the second electric pile 8 can normally operate.

It will be appreciated that by providing the first and second regulating units 6 and 13, the flow of hydrogen through the gas supply pipe 15 can also be controlled, and the hydrogen pressure in the second gas supply branch pipe and the second stack 8 can be maintained at a higher level for a long period of time, so that air can be prevented from entering the stack anode cavity of the second fuel cell module to form a hydrogen air interface.

In some possible embodiments provided by the present disclosure, the multi-module fuel cell hydrogen supplementing system further includes a first on-off unit 7 and a second on-off unit 14, the first on-off unit 7 is disposed between the first adjusting unit 6 and the air tank 19, and the second on-off unit 14 is disposed between the second adjusting unit 13 and the air tank 19.

The on-off state of the first hydrogen supply branch pipe and the second hydrogen supply branch pipe can be controlled by arranging the first on-off unit 7 and the second on-off unit 14, so that the working stability of the multi-module fuel cell hydrogen supplementing system can be improved.

The first on-off unit 7 and the second on-off unit 14 may be ball valves, gate valves, butterfly valves, solenoid valves, or the like. In the embodiment of the application, the first on-off unit 7 and the second on-off unit 14 are electromagnetic valves, so that the automation degree of the hydrogen supplementing system of the multi-module fuel cell can be improved.

Specifically, the first on-off unit 7 is disposed on the first hydrogen supply branch pipe and is used for controlling the on-off state of the first hydrogen supply branch pipe, and the second on-off unit 14 is disposed on the second hydrogen supply branch pipe and is used for controlling the on-off state of the second hydrogen supply branch pipe.

Wherein the first on-off unit 7 is provided on the upstream side of the first regulating unit 6 in the flow path direction, and the second on-off unit 14 is provided on the upstream side of the second regulating unit 13 in the flow path direction.

In some possible embodiments provided by the present disclosure, the multi-module fuel cell hydrogen supplementing system further includes a pressure reducing unit 18, where the pressure reducing unit 18 is in communication with the outlet of the air tank 19 for reducing the outlet pressure of the air tank 19.

The pressure of the exhaust gas of the gas storage tank 19 can be reduced by providing the pressure reducing unit 18 and communicating the pressure reducing unit 18 with the outlet of the gas storage tank 19, so as to improve the stability of the operation of the hydrogen supplementing system of the multi-module fuel cell.

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

Specifically, the decompression unit 18 is disposed on the hydrogen supply main pipe, and the decompression unit 18 is communicated with 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 after passing through the decompression unit 18.

According to the multi-module fuel cell hydrogen supplementing system provided by the embodiment of the utility model, the hydrogen supplying pipelines of the two fuel cell modules can be communicated through the air supplementing pipe 15, so that after one fuel cell module is stopped, the other fuel cell module can supplement hydrogen to the non-working fuel cell module through the air supplementing pipe 15, and therefore the hydrogen pressure in the anode cavity of the electric pile in the non-working fuel cell module can be maintained at a higher level, namely, the anode cavity of the electric pile in the non-working fuel cell module is ensured to be in a positive pressure state, the purpose of blocking air from entering the anode cavity of the electric pile is realized, and further, the hydrogen air cross section formed by the contact of residual hydrogen in the anode cavity of the electric pile and the air can be avoided, the performance of the fuel cell can be improved, and the service life of the fuel cell can be prolonged.

It will be readily appreciated by those skilled in the art that the above advantageous ways can be freely combined and superimposed without conflict.

The foregoing description of the preferred embodiments of the application is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the application. The foregoing is merely a preferred embodiment of the present application, and it should be noted that it will be apparent to those skilled in the art that modifications and variations can be made without departing from the technical principles of the present application, and these modifications and variations should also be regarded as the scope of the application.

Claims (10)

1. A multi-module fuel cell hydrogen replenishing system, characterized in that it comprises at least two fuel cell modules and a gas storage tank (19), at least two of the fuel cell modules comprise 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); 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 replenishing system according to claim 1 is characterized in that the multi-module fuel cell hydrogen replenishing system also includes a distribution unit (16), the distribution unit (16) 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 replenishing pipe (15). 3. The multi-module fuel cell hydrogen replenishing system according to claim 2 is characterized in that the multi-module fuel cell hydrogen replenishing system also includes a first dehydration unit (2) and a second dehydration unit (9), 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 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 direction. 4. The multi-module fuel cell hydrogen replenishing system according to claim 3 is characterized in that 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 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 replenishing system according to claim 3 is characterized in that 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), 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. 6. The multi-module fuel cell hydrogen replenishing 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 replenishing 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 replenishing system according to claim 1 is characterized in that 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), and 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 replenishing system according to claim 8 is characterized in that 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). 10. The multi-module fuel cell hydrogen replenishing system according to claim 1 is characterized in that the multi-module fuel cell hydrogen replenishing system also includes a pressure reducing unit (18), and the pressure reducing unit (18) is connected to the outlet of the gas storage tank (19) to reduce the outlet pressure of the gas storage tank (19).