KR20100063247A - System to manage water and fuel for dead-end mode pem fuel cell - Google Patents

Abstract

PURPOSE: A water and fuel management system for a polymer electrolyte membrane fuel cell is provided to reduce an unnecessary loss of fuel and an oxidizer, and to improve the efficiency of the fuel cell. CONSTITUTION: A water and fuel management system for a polymer electrolyte membrane fuel cell using a dead-end mode comprises the following: a fuel cell system(1) including an anode(11) for supplying fuel, and a cathode(12) for supplying an oxidizer around a polymer electrolyte membrane(13); a pulsating inductor(40) inducing the pulsating with a constant cycle and amplitude on the cathode while being connected with a discharging path(38b); a voltage measurement unit(16) measuring the voltage generated from the fuel cell; and a controller(17) controlling the cycle and the amplitude from the pulsating inductor.

Description

System to manage water and fuel of polymer electrolyte membrane fuel cell using dead end mode {SYSTEM TO MANAGE WATER AND FUEL FOR DEAD-END MODE PEM FUEL CELL}

The present invention relates to a system for managing water and fuel in a polymer electrolyte membrane fuel cell using a dead end mode, and more particularly, to discharge water generated in a polymer electrolyte membrane fuel cell using a dead end mode. A polymer electrolyte membrane fuel cell system using a pulsator and a selective permeable membrane in a polymer electrolyte membrane fuel cell.

Petroleum energy, which has significantly reduced production compared to demand, not only causes serious natural environmental problems but also has a limited amount of reserves. Among them, the fuel cell system using hydrogen energy has a high thermal efficiency as compared to the current internal combustion engine, and the product is also clean and is being spotlighted as an excellent environmentally friendly alternative energy.

The fuel cell generates electric power by performing an electrochemical reaction. Typical fuel cell reactants are fuels such as hydrogen or hydrocarbons and oxidants such as air.

Specifically, the fuel cell typically includes three basic elements: an anode, a cathode, and an electrolyte. The anode and cathode are porous and usually comprise an electrocatalyst, the fuel travels through the porous anode and the oxidant travels through the porous cathode. Fuel traveling through the porous anode is hydrogen or hydrocarbons stored in a high pressure fuel tank.

Among them, Polymer Electrolyte Membrane Fuel Cell (PEMFC) can be divided into Open Mode and Dead-End Mode depending on how the system is operated. It is aimed at fuel cells that are operated at.

In the fuel cell system using the open mode, since the utilization rate of the fuel is 100% or less, the amount of fuel supplied must be larger than the amount of fuel for producing the required current. In addition, unreacted fuel that is not absorbed into the gas diffusion layer is discharged with water out of the system, so there is a separate recycling system.

On the other hand, the fuel cell operated in the dead end mode supplies fuel only by pressure without a separate blower, and the utilization rate of the fuel may be maximized. In addition, since the moisture generated after the reaction is always present in the channel, there is no need for a separate fuel supply device and a recirculation device, and the humidification device may also be small. In addition, since the pressure loss is less, the pressure is applied evenly inside the fuel cell channel, so the output is always higher than in the open mode.

Fuel cell systems using dead end mode can be classified into three categories. First, the anode side operates in dead end mode and the cathode side operates fuel cell in open mode. Secondly, the cathode side operates in the dead end mode and the anode side operates the fuel cell in the open mode. Third, the anode side and the cathode side both operate the fuel cell in the dead end mode.

In the fuel cell system using the dead end mode, since the fuel cell operates in a state in which the flow path of the fuel discharged from the anode of the fuel cell and / or the flow path of the oxidant discharged from the cathode of the fuel cell is closed, Over time, the amount of water that collects in the flow path of fuel and oxidant increases.

For example, fuel and oxidant react to produce electrons at the anode, which cannot pass through the electrolyte and form a current towards the external circuit. The cathode accepts electrons from an external circuit, and the electrons recombine with oxygen to form a large amount of water in the cathode. In addition, a large amount of water formed on the cathode side may be supplied to the anode through the electrolyte by osmosis to generate water on the anode side.

Fuel cell systems using dead end mode are closed and there is no initial fuel outflow. On the other hand, although the partial pressure of hydrogen is high and the partial pressure of water is low at the beginning of the reaction, the partial pressure of water is high and the partial pressure of hydrogen is low as the fuel cell driving time becomes longer. Accordingly, a flooding phenomenon occurs due to the generated water, the portion to be reacted is covered with water, and the reaction area is reduced, thereby degrading the performance of the fuel cell.

In other words, if water is blocked by flooding or the partial pressure of hydrogen is low, the reaction is difficult, and the produced water is combined with carbon by reverse reaction to reproduce hydrogen. There is a problem that irreversible loss occurs as a loss occurs.

Therefore, in order to solve the above problems in the conventional fuel cell using the dead end mode, a method of discharging water to the outside of the fuel cell through purging has been used.

1 is a schematic diagram of a fuel cell system using a conventional dead and mode. 1 illustrates a case in which both the anode and the cathode are in a dead end mode, and either the anode or the cathode may be in an open mode.

As shown in the figure, the fuel is supplied from the fuel tank 14 to the mass flow controller (Mass Flow Controller) 31a, the pressure control valve 32a, the water humidifier 34 (Membrane Humidifier) It enters the input terminal 21a of the anode 11 of the fuel cell via 33a and a mass flow meter (MFM) 35a.

The oxidant is supplied to the fuel cell via the mass flow controller 31b, the pressure regulating valve 32b, the water humidifier 33b and the mass flow meter 35b, which receive water from the oxidant tank 15. It enters the input terminal 21b of the cathode 12.

The water tank 34 for supplying moisture to the mass flow controllers 31a and 31b, the mass flow meters 35a and 35b, and the membrane humidifiers 33a and 33b and the membrane humidifiers 33a and 33b is conventionally dead. Since it is not an essential component in the fuel cell using the end mode, it is not necessary to add it according to the designer's choice.

The fuel and oxidant input to the fuel cell 10 react with each other. Most of the water generated by the reaction is generated on the cathode 12 side, and a large amount of water is supplied to the anode 11 side through the electrolyte membrane 13 by osmosis.

The water generated at the cathode 12 side is discharged to the output end 22b of the cathode 12 and reaches the purge valve 37b via the discharge passage 38b and the cathode vent 36b.

In addition, the water supplied to the anode 11 side is discharged to the output end 22a of the anode 11 and reaches the purge valve 37a via the discharge oil 38a and the anode band 36a.

On the other hand, the voltage measuring means 16 measures the voltage of the fuel cell 10, and when the voltage is lower than the predetermined value, the control unit 17 opens the purge valves 37a and 37b to discharge water. The voltage is being restored. Such a technique is well shown in [Document 1] and [Document 2] below.

[Patent 1] Japanese Patent Laid-Open No. 2004-536436

[Patent 2] International Patent Application, International Application No. PCT / JP2007 / 072916

FIG. 2 is a graph showing a voltage of a fuel cell with respect to a purging time in a fuel cell system using a conventional dead and mode, and FIG. 3 is a graph showing voltage and pressure with respect to time.

In FIG. 2, when the current output from the fuel cell is 40 A, the voltage value output from the fuel cell decreases as the fuel cell operates. That is, as the operation time increases, water is generated inside the fuel cell, which deteriorates the performance of the fuel cell, and thus the output voltage value decreases. Therefore, the purge valve is opened at regular intervals to discharge water to recover the original voltage value.

3 is a graph showing changes in pressure and voltage over time in one cycle when operating at a current density of 1.8 A / cm ² .

When the purge valves 37a and 37b are opened (when the purge time is 0), the voltage is rapidly recovered, and after the purge valves 37a and 37b are closed, water is generated and the voltage drops to a constant slope. But soon the voltage drops off, and at some point the voltage drops sharply again. This is because the voltage recovers rapidly as the water generated in the channel escapes, but when the purge valve is closed, the voltage drops again as water is generated.

However, when the purge valves 37a and 37b are opened, when the speed of the dynamic pressure due to the speed of the flowing fluid becomes zero, the positive pressure is converted to 1.5 bar to increase the reaction pressure of the fuel and the voltage is recovered. Therefore, the slope of the drop in the overall voltage becomes smaller due to the effect of increasing the voltage while the pressure dropped. However, after all of the pressure has been restored, only the water is affected again, and the voltage drops sharply.

4 is a graph showing the purging time for the current in the fuel cell system using a conventional dead and mode, Figure 5 is a graph showing the one time purging average time for the current density according to the pressure.

As can be seen from FIG. 4, the higher the current value output from the fuel cell, the shorter the purging time. For example, if you want to get 40A, you have to purge every 45 minutes, but if you want to get 45A, you have to purge every 10 minutes.

Under the same pressure conditions, as the current density increases, the amount of moisture blocking the gas diffusion layer increases, so it can be seen that the cycle of discharging moisture decreases.

As can be seen in Figure 5, at the same current density, as the operating pressure increases, the output value increases but the cycle becomes shorter. This also means that as the pressure increases and the output increases, more water is generated and more water must be discharged, which results in more purging.

On the other hand, when the water is discharged through the purging in the fuel cell using the dead-and-mode mode, the fuel is also discharged along with the discharge of water in addition to the fuel is unnecessarily consumed, there is a problem that the voltage value is greatly changed during purging, the voltage stability is inferior . As a result, in the case of a fuel cell using the dead end mode, there is a problem that the efficiency of the fuel cell is reduced due to the purging.

The present invention has been proposed to solve the above problems, by adding a pulsation-inducing means and a selective permeable membrane to the fuel cell using the dead end mode, by increasing the period of purging to discharge only the water accumulated in the fuel cell fuel And to prevent unnecessary loss of the oxidant and to improve the efficiency of the fuel cell.

In order to achieve the above object, an anode to which fuel is supplied and a cathode to which an oxidant is supplied are formed with a polymer electrolyte membrane interposed therebetween, and using a dead end mode for driving in a state in which the discharge flow path of the cathode is blocked. A fuel cell system comprising: pulsation inducing means connected to a discharge passage of the cathode to induce a pulsation having a predetermined amplitude and period on the cathode side; Voltage measuring means for measuring a voltage generated in the fuel cell; And it provides a system for managing the water and fuel of the polymer electrolyte membrane fuel cell using a dead and mode, characterized in that it comprises a control unit for controlling the amplitude and the period of the pulsation-inducing means.

Preferably, the dead end mode further comprises a selective permeable membrane disposed between the discharge passage of the cathode and the pulsation inducing means to pass water and block passage of the oxidant to discharge only water to the outside of the fuel cell. A system for managing water and fuel in a polymer electrolyte membrane fuel cell to be used is provided.

Also preferably, the selective permeable membrane is provided with a system for managing the water and fuel of the polymer electrolyte membrane fuel cell using the dead end mode characterized in that it further comprises a pin attached to the surface to induce the evaporation of water. .

Also preferably, the dead end mode is controlled by the control unit, and further comprising a purge valve to open the discharge flow path of the cathode when the voltage measured from the voltage measuring means is less than a predetermined value. A system for managing water and fuel in a polymer electrolyte membrane fuel cell to be used is provided.

In order to achieve the object as described above, a fuel anode and a cathode to which the oxidant is supplied are formed with a polymer electrolyte membrane interposed therebetween, and a fuel using a dead end mode for driving the discharge path of the anode in a blocked state. A battery system comprising: pulsation-producing means connected to a discharge passage of the anode to induce a pulsation having a predetermined amplitude and period on the anode side; Voltage measuring means for measuring a voltage generated in the fuel cell; And it provides a system for managing the water and fuel of the polymer electrolyte membrane fuel cell using a dead and mode, characterized in that it comprises a control unit for controlling the amplitude and the period of the pulsation-inducing means.

Preferably, the dead end mode further comprises an optional permeable membrane disposed between the anode exhaust passage and the pulsation inducing means to allow water to pass through and to block the passage of fuel to discharge only water to the outside of the fuel cell. A system for managing water and fuel in a polymer electrolyte membrane fuel cell is provided.

Also preferably, the selective permeable membrane is attached to the surface of the polymer electrolyte membrane fuel cell using a dead end mode, characterized in that it further comprises a pin for inducing evaporation of water provided by the system for managing the fuel do.

Also preferably, the dead end mode is controlled by the control unit and further includes a purge valve which opens the discharge flow path of the anode when the voltage measured by the voltage measuring means becomes less than a predetermined value. A system for managing water and fuel in a polymer electrolyte membrane fuel cell is provided.

In order to achieve the above object, an anode to which fuel is supplied and a cathode to which an oxidant is supplied are formed with a polymer electrolyte membrane interposed therebetween, and the anode is discharged and the cathode is discharged. In a fuel cell system using a dead end mode, a pulsation-producing means connected to the discharge passage of the anode and the discharge passage of the cathode, respectively, to cause pulsation having a predetermined amplitude and period on the anode and the cathode side. ; Voltage measuring means for measuring a voltage generated in the fuel cell; And it provides a system for managing the water and fuel of the polymer electrolyte membrane fuel cell using a dead and mode, characterized in that it comprises a control unit for controlling the amplitude and the period of the pulsation-inducing means.

Preferably, the anode is disposed between the discharge passage of the anode and the pulsation inducing means and between the discharge passage of the cathode and the pulsation triggering water, respectively, allowing water to pass through and blocking the passage of fuel and oxidant so that only water is discharged to the outside of the fuel cell. There is provided a system for managing water and fuel in a polymer electrolyte membrane fuel cell using a dead end mode, characterized in that it further comprises a selective permeable membrane.

Also preferably, the selective permeable membrane is provided with a system for managing the water and fuel of the polymer electrolyte membrane fuel cell using the dead end mode characterized in that it further comprises a pin attached to the surface to induce the evaporation of water. .

Also preferably, the control unit further comprises a purge valve which opens the discharge flow path of the anode and the discharge flow path of the cathode when the voltage measured from the voltage measuring means becomes less than a predetermined value. A system for managing water and fuel in a polymer electrolyte membrane fuel cell using a dead end mode is provided.

The present invention as described above, by adding the pulsation-inducing means and the optional permeable membrane to the fuel cell using the dead end mode, to discharge only the accumulated water inside the fuel cell to prevent unnecessary loss of fuel and oxidant, the efficiency of the fuel cell This has the effect of making it higher.

The above-mentioned objects, features and advantages will become more apparent from the following detailed description in conjunction with the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same components have the same number as much as possible even if displayed on different drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 6 is a schematic diagram showing that the pulsation inducing portion and the selective permeable membrane is added to the cathode side in the system for managing water and fuel of the polymer electrolyte membrane fuel cell using the dead end mode according to the present invention.

According to an embodiment of the present invention, the polymer electrolyte membrane fuel cell system 1 in which the cathode 12 side of the polymer electrolyte membrane fuel cell 10 is operated in a dead end mode, and the anode 11 side is operated in an open mode. ), The pulsation inducing portion 40 and the optional permeable membrane 50 are added to the cathode 12 side.

7 is a schematic diagram illustrating a pulsation inducing part and a selective permeable membrane are added to an anode side in a system for managing water and fuel in a polymer electrolyte membrane fuel cell using a dead end mode according to the present invention.

According to an embodiment of the present invention, the polymer electrolyte membrane fuel cell system 1 in which the anode 11 side of the polymer electrolyte membrane fuel cell 10 is operated in a dead end mode and the cathode 12 side is operated in an open mode. ), A pulsation inducing portion 40 and an optional permeable membrane 50 are added to the anode 12 side.

8 is a schematic diagram illustrating a pulsation inducing part and a selective permeable membrane are added to the cathode and the anode side in a system for managing water and fuel in a polymer electrolyte membrane fuel cell using a dead end mode according to the present invention.

According to one embodiment of the present invention, in the polymer electrolyte membrane fuel cell system 1 in which both the anode 11 side and the cathode 12 side of the polymer electrolyte membrane fuel cell 10 are operated in the dead end mode, The pulsation inducing part 40 and the selective permeable membrane 50 are added to the anode 11 and the cathode 12 side, respectively.

Hereinafter, the pulsation inducing portion 40 and the selective permeable membrane 50 used in the present invention will be described.

Fig. 9 is a schematic diagram of the pulsation inducing part used in the present invention, and Fig. 10 is a schematic diagram of the selective permeable membrane used in the present invention.

Any device may be used as long as the pulsation generator used in the present invention is a device for generating vibration, and includes, but is not limited to, an acoustic vibrator such as a reversible pump, a control valve, a speaker, or another shock wave generator.

9, the pulsation inducing part 40 is a device for increasing the diffusion depending on a predetermined period and the distance of the reciprocating movement, using the polymer electrolyte membrane fuel cell 10 by using the pulsation inducing part 40 The diffusion of the fuel and the oxidant therein can be increased to make their concentration distribution uniform.

By the operation of the pulsation inducing portion 40, the distribution of water, fuel, and oxidant present in the polymer electrolyte membrane fuel cell 10 becomes uniform, thereby increasing the purging cycle.

The pulsation induction part 40 includes a vibration fluid flow part 41 connected to the discharge flow paths 38a and 38b, a motor 45 for transmitting power to the pulsation induction means 40, and a disk rotated by the motor 45 ( 44, a crank 43 for connecting the disk 44 and the piston 42, and a piston 42 for converting the vertical movement of the crank to the horizontal movement of the vibration flow portion 41.

The pulsation inducing part shown in FIG. 9 represents only one embodiment of the pulsation inducing part that can be used in the present invention, and the pulsation inducing part is not limited to the embodiment shown in FIG. 9.

On the other hand, according to another embodiment of the present invention, the polymer electrolyte membrane fuel cell system 1 according to the present invention is provided between the discharge passage 38a of the anode and / or the discharge passage 38b of the cathode and the pulsation causing means. It may be configured to further include an optional permeable membrane 50 disposed in the water passage to block the passage of the fuel and oxidant to discharge only the water to the outside of the fuel cell.

The selective permeable membrane 50 shown in FIG. 10 allows water to pass through and gas not to pass through, regardless of which material may be used as Nafion or a total heat exchanger.

By selectively discharging water by adding the selective permeable membrane 50 to the polymer electrolyte membrane fuel cell system 1, the partial pressure of water in the polymer electrolyte membrane fuel cell 10 is increased and the partial pressure of fuel is prevented from being lowered. Can be.

That is, since the temperature in the polymer electrolyte membrane fuel cell 10 is high and the temperature of the selective permeable membrane 50 is low, condensation occurs in the selective permeable membrane 50. The condensed water is discharged to the outside of the polymer electrolyte membrane fuel cell 10 through the selective permeable membrane 50.

As shown in the figure, the selective permeable membrane 50 may further include a fin 51 for inducing evaporation of water on the surface of the selective permeable membrane 50 in order to discharge more water.

Meanwhile, the controller 17 of FIGS. 6 to 8 is connected to the voltage measuring means 16. When the voltage measuring means 16 measures the voltage generated in the polymer electrolyte membrane fuel cell 10 and transmits the voltage to the control unit 17, the control unit 17 controls whether the pulsation inducing unit 40 is operated and how it is operated. do.

The control unit 17 may allow the pulsation inducing unit 40 to operate continuously from the initial stage of driving the fuel cell until the driving of the fuel cell is stopped, and the voltage measured from the polymer electrolyte membrane fuel cell 10 is low. It may be possible to selectively operate only if it is lost.

As the polymer electrolyte membrane fuel cell 10 is driven, the control unit 17 increases the partial pressure of water in the fuel cell so that the voltage measured by the voltage measuring means 16 decreases, so that the pulsation inducing unit 40 operates. To control.

In addition, even when the pulsation induction part 40 is continuously implemented, the partial pressure of water is reduced while changing the amplitude and frequency due to the pulsation, and the partial pressure of the fuel and the oxidant can be increased.

Therefore, according to the present invention, water can be discharged without the purge valves 37a and 37b by adding the pulsation inducing unit 40 and the optional permeable membrane 50 to the conventional polymer electrolyte membrane fuel cell. As a result, when the purge valves 37a and 37b are opened, the fuel and the oxidant as well as the water are discharged together to overcome the problem that the efficiency of the fuel cell is lowered.

Meanwhile, according to another embodiment of the present invention, the polymer electrolyte membrane fuel cell system 1 further includes purge valves 37a and 37b in addition to the pulsation inducing part 40 and the selective permeable membrane 50. The controller 17 determines whether the purge valves 37a and 37b are opened or closed.

That is, if the water is not completely discharged by the selective permeable membrane 50, and some water remains, this may be discharged by opening the purge valves 37a and 37b. When the water is discharged by using the selective permeation membrane 50 and the purge valves 37a and 37b simultaneously, the purging period is much reduced than before. As a result, since water is first discharged through the selective permeable membrane, when the remaining water is discharged secondly through the purge valves 37a and 37b, the time (purging period) for opening the purge valves 37a and 37b is increased. It becomes long and can drive a fuel cell efficiently.

11 is a graph showing a voltage value against a purging time in a fuel cell system not using a pulsation inducing unit, and FIG. 12 is a water of a polymer electrolyte membrane fuel cell using a dead end mode using a pulsation inducing unit according to the present invention. In a system for managing excess fuel, the graph shows a voltage value against a purging time.

According to one embodiment of a system for managing water and fuel in a polymer electrolyte membrane fuel cell using a dead end mode according to the present invention, as shown in FIG. 6, the cathode 12 side is a dead end mode, and the anode 11 ) Is a graph measuring voltage when operating current density is 1.8A / cm ² in open mode.

The integrated value of the graph represents the amount of power. When the fuel cell is operated in open mode under the same experimental conditions, the average of measured voltage values is about 0.54V. On the other hand, as shown in Figure 11 it can be seen that the voltage value measured in the conventional fuel cell driven in the dead and mode is 0.550V ~ 0.615V. That is, in the dead end mode, there is a fuel discarded by purging, but it can be seen that the amount of power obtained over time is higher than the amount of fuel discarded.

This is because the cathode (12) side is a dead end mode, the anode (11) side is operated in an open mode, the pressure of the oxidant is equally applied to the inside of the fuel cell, so the pressure loss is less than the open mode and fuel This is because the utilization rate of is much higher than that of open mode.

Considering that fuel is injected only by a predetermined pressure in the conventional fuel cell system in the dead end mode, the above result shows that the output is higher in the dead end mode without a separate power source for supplying fuel. Means that you can.

12 is a graph showing the period when pulsating flow is applied to the cathode 12 side when the current density is 1.8 A / cm ² . The pulsation was applied at an amplitude of 10 mm and a frequency of 2 Hz. As a result, the average period of purging is 900 seconds, which is about 4 times larger than the average period of purging shown in FIG.

If you look at the shape of one cycle, you can see that the rate of voltage drop decreases due to pulsation, which increases the period. This is because the water accumulated in the rear end of the fuel cell 10 is uniformly dispersed through the pulsation into the channel, thereby releasing moisture blocking the gas diffusion layer.

Therefore, in the fuel cell system 1 using the dead end mode, when the pulsation induction part 40 is applied to the rear end of the fuel cell, the output and the amount of power are increased as compared with the open mode, and the pulsation induction part 40 By increasing the period of purging compared to when there is no application of), unnecessary fuel consumption can be reduced.

As shown in FIG. 7, the pulsation induction part 40 may be applied to the anode 11 side, or as shown in FIG. 8, the anode 11 side and the cathode 12 side may be applied to both the pulsation induction part 40. In this case, as described above, it will be apparent to those skilled in the art that the purging time is increased to increase the efficiency of the fuel cell.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes are possible in the art without departing from the technical spirit of the present invention. It will be clear to those of ordinary knowledge.

1 is a schematic diagram of a fuel cell system using a conventional dead and mode.

2 is a graph showing the voltage of a fuel cell versus a purging time in a fuel cell system using a conventional dead and mode.

Figure 3 is a graph showing the voltage and pressure over time in a fuel cell system using a conventional dead and mode.

4 is a graph showing the purging time of the current in the fuel cell system using a conventional dead and mode.

FIG. 5 is a graph showing the time-based one purging average time with respect to the current density in a fuel cell system using a conventional dead end mode.

Figure 6 is a schematic diagram showing that the pulsation inducing portion and the selective permeable membrane is added to the cathode side in the system for managing water and fuel of the polymer electrolyte membrane fuel cell using the dead end mode according to the present invention.

7 is a schematic diagram illustrating a pulsation inducing part and a selective permeable membrane are added to an anode side in a system for managing water and fuel in a polymer electrolyte membrane fuel cell using a dead end mode according to the present invention.

8 is a schematic diagram illustrating a pulsation inducing part and a selective permeable membrane are added to the cathode and the anode side in a system for managing water and fuel in a polymer electrolyte membrane fuel cell using a dead end mode according to the present invention.

9 is a schematic diagram of a pulsation inducing unit used in a system for managing water and fuel in a polymer electrolyte membrane fuel cell using a dead end mode according to the present invention.

10 is a schematic diagram of a selective permeable membrane used in a system for managing water and fuel in a polymer electrolyte membrane fuel cell using a dead end mode according to the present invention.

11 is a graph showing a voltage value against a purging time in the fuel cell system without using the pulsation inducing unit.

12 is a graph showing voltage values versus purging time in a system for managing water and fuel in a polymer electrolyte membrane fuel cell using a dead end mode using a pulsation inducing unit according to the present invention.

<Description of the symbols for the main parts of the drawings>

1: fuel cell system 10: fuel cell

11: anode 12: cathode

13: electrolyte 14: fuel

15: oxidant 16: voltage measuring means

17: control unit

21a: anode input 21b: cathode input

22a: anode output stage 22b: cathode output stage

31a, 31b: mass flow controller 32a, 32b: pressure regulating valve

33a, 33b: membrane humidifier 34: water tank

35a, 35b: mass flow meter

36a: anodevant 36b: cathodevant

37a, 37b: purge valve 38a, 38b: discharge flow path

40: pulsation induction part 41: vibration flow part

42: piston 43: crank

44: disk 45: motor

50: selective permeable membrane 51: pin

Claims (12)

In a fuel cell system using a dead end mode for driving a state in which the anode is supplied with a fuel and the cathode is supplied with an oxidant, the polymer electrolyte membrane interposed therebetween, Pulsation inducing means connected to the discharge passage of the cathode to cause pulsation having a predetermined amplitude and period on the cathode side; Voltage measuring means for measuring a voltage generated in the fuel cell; And And a control unit for controlling the amplitude and the period of the pulsation-producing means. The system for managing water and fuel in a polymer electrolyte membrane fuel cell using a dead end mode. The method of claim 1, It is disposed between the discharge passage of the cathode and the pulsation inducing means is a polymer electrolyte using a dead end mode characterized in that it further comprises an optional permeable membrane for passing the water and blocking the passage of the oxidant to discharge only the water to the outside of the fuel cell A system for managing water and fuel in membrane fuel cells. The method of claim 2, The selective permeable membrane is attached to the surface of the system for managing the water and fuel of the polymer electrolyte membrane fuel cell using a dead end mode, characterized in that it further comprises a pin to induce the evaporation of water. The method according to claim 1 or 2, The polymer electrolyte membrane controlled by the control unit, and further comprising a purge valve to open the discharge flow path of the cathode when the voltage measured from the voltage measuring means is less than a predetermined value. A system for managing water and fuel in fuel cells. In a fuel cell system using a dead end mode for driving a state in which the anode and the oxidant is supplied with a fuel supplied between the polymer electrolyte membrane, and the discharge path of the anode is blocked, Pulsation inducing means connected to the discharge passage of the anode to induce a pulsation having a predetermined amplitude and period on the anode side; Voltage measuring means for measuring a voltage generated in the fuel cell; And And a control unit for controlling the amplitude and the period of the pulsation-producing means. The system for managing water and fuel in a polymer electrolyte membrane fuel cell using a dead end mode. The method of claim 5, A polymer electrolyte membrane using a dead end mode, characterized in that it further comprises an optional permeable membrane disposed between the discharge passage of the anode and the pulsation inducing means to pass water and block the passage of fuel to discharge only water to the outside of the fuel cell. A system for managing water and fuel in fuel cells. The method of claim 6, The selective permeable membrane is attached to the surface of the system for managing the water and fuel of the polymer electrolyte membrane fuel cell using a dead end mode, characterized in that it further comprises a pin to induce the evaporation of water. The method according to claim 5 or 6, The polymer electrolyte membrane fuel controlled by the control unit, and further comprising a purge valve for opening the discharge flow path of the anode when the voltage measured from the voltage measuring means is less than a predetermined value A system for managing water and fuel in batteries. An anode supplied with fuel and a cathode supplied with an oxidant are formed with a polymer electrolyte membrane interposed therebetween, and a fuel cell system using a dead end mode for driving the anode discharge path and the cathode discharge path in a blocked state. In Pulsation inducing means connected to the discharge passage of the anode and the discharge passage of the cathode, respectively, to cause pulsations having a predetermined amplitude and period on the anode and the cathode side; Voltage measuring means for measuring a voltage generated in the fuel cell; And And a control unit for controlling the amplitude and the period of the pulsation-producing means. The system for managing water and fuel in a polymer electrolyte membrane fuel cell using a dead end mode. 10. The method of claim 9, A selective permeable membrane disposed between the discharge passage of the anode and the pulsation inducing means and between the discharge passage of the cathode and the pulsation triggering water, respectively, allowing water to pass through and blocking the passage of fuel and oxidant to discharge only water to the outside of the fuel cell. A system for managing water and fuel in a polymer electrolyte membrane fuel cell using a dead end mode further comprising. The method of claim 10, The selective permeable membrane is attached to the surface of the system for managing the water and fuel of the polymer electrolyte membrane fuel cell using a dead end mode, characterized in that it further comprises a pin to induce the evaporation of water. 11. The method according to claim 9 or 10, And a purge valve controlled by the controller, the purge valve opening the discharge passage of the anode and the discharge passage of the cathode when the voltage measured by the voltage measuring means is equal to or less than a predetermined value. Water and fuel management system of the polymer electrolyte membrane fuel cell using.

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