JP5470698B2 - Operation control apparatus and operation control method for fuel cell system - Google Patents

Description

  The present invention relates to an apparatus and a method for controlling the operation of a fuel cell system using a solid polymer fuel cell of the internal humidification latent heat cooling type.

  The electrolyte membrane of the fuel cell exhibits high power generation efficiency in a wet state. Therefore, the wet state of the electrolyte membrane is maintained by supplying pure water to the reaction gas and humidifying it.

Various methods for supplying pure water to the reaction gas have been proposed. For example, Patent Document 1 proposes a fuel cell that collects and uses the reaction water generated during the catalytic reaction.
JP 2005-285694 A

  However, when trying to operate below freezing point, the reaction water is pure water, so it may freeze and cannot be recovered well.

  The present invention has been made paying attention to such a conventional problem, and provides an operation control device and an operation control method for a fuel cell system that can recover the reaction water without freezing it and can operate at below freezing point. For the purpose.

  The present invention solves the above problems by the following means. In addition, in order to make an understanding easy, although the code | symbol corresponding to embodiment of this invention is attached | subjected, it is not limited to this.

The present invention is an operation control device for a fuel cell system using a polymer electrolyte fuel cell (1), and the temperature of cooling water can be adjusted so that pure water present in the fuel cell does not freeze. The solid polymer fuel cell (1) includes an anode electrode layer provided on one surface of the electrolyte membrane, a seal carrier adjacent to the anode electrode layer, A cathode electrode layer provided on the other surface of the electrolyte membrane; an anode separator that includes an anode gas channel that overlaps the anode electrode layer and supplies anode gas to the anode electrode layer; and is adjacent to the anode separator. the overlap seal carrier, the cooling water supplied from the cooling water passage and a cooling body that flows between the seal carrier, overlapping the cathode electrode layer, the cathode A cathode gas supply section in which a cathode gas flow path for supplying a cathode gas to the electrode layer is formed, and a cathode that is provided downstream of the cathode gas flow path and that overlaps the cooling body and flows through the cathode gas flow path And a condensed water generation unit (14) for condensing the moisture contained in the gas and humidifying the cathode gas flowing into the cathode gas flow path with the moisture.

  According to the present invention, the water generated by the catalytic reaction is condensed in the condensed water generation unit by the cooling water supplied from the cooling water path, so that the reaction water can be recovered without freezing and can be operated below freezing point. Become.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.

  FIG. 1 is a cross-sectional view showing a fuel cell stack used in a fuel cell system according to the present invention.

  The fuel cell stack 1 has a configuration in which a plurality of power generation cells 10 are stacked and sandwiched between end plates 40 from both sides thereof.

  The power generation cell 10 is a unit cell of a fuel cell. Each power generation cell 10 generates an electromotive voltage of about 1 volt (V).

  The power generation cell 10 has a structure in which an anode separator 12 and a cathode separator 13 are laminated on the front and back surfaces of a membrane electrode assembly (hereinafter referred to as “MEA”) 11.

  The MEA 11 is provided with an anode electrode layer 11b on one surface of an electrolyte membrane 11a made of an ion exchange membrane and a cathode electrode layer 11c on the other surface. The MEA 11 is extremely thin and has a thickness of several tens of microns.

  The anode separator 12 overlaps the anode electrode layer 11b. In the anode separator 12, an anode gas flow path 12a for supplying an anode gas to the anode electrode layer 11b is formed on the surface facing the anode electrode layer 11b. A recess 12b through which pure water for humidifying the reaction gas flows is formed on the opposite surface. The anode separator 12 is a porous body. It is desirable that the gas pressure is always set higher than the water pressure. Further, the porous body is desirably hydrophilic in order to facilitate water permeation.

  The cathode separator 13 overlaps the cathode electrode layer 11c. In the cathode separator 13, a cathode gas flow path 13a for supplying a cathode gas to the cathode electrode layer 11c is formed on the surface facing the cathode electrode layer 11c. On the opposite surface, a recess 13b through which pure water for humidifying the reaction gas flows is formed. The cathode separator 13 is formed of a water-permeable porous body. It is desirable that the gas pressure is always set higher than the water pressure. The recess 12b of the anode separator 12 and the recess 13b of the cathode separator 13 form a pure water channel through which pure water flows.

  FIG. 2 is a view showing an anode separator, FIG. 2 (A) is a surface facing the anode electrode layer, and FIG. 2 (B) is a back surface thereof.

  The anode separator 12 is a porous body. As shown in FIG. 2A, the anode separator 12 has an anode gas channel 12a formed on the surface facing the anode electrode layer 11b. The anode gas flow path 12a overlaps the anode electrode layer 11b. The anode gas flowing in from the anode gas inlet manifold 21a flows through the anode gas flow path 12a and flows out from the anode gas outlet manifold 21b. Further, as shown in FIG. 2B, the anode separator 12 has a pure water flow path 12b through which pure water flows on the surface opposite to the surface facing the anode electrode layer 11b. This pure water humidifies the anode gas flowing through the anode gas flow path 12a. The anode separator 12 is a water-permeable porous body. In the present embodiment, the pure water passage 12b is a straight passage.

  A cooling body 14 is provided adjacent to the anode separator 12. As will be described later, the cooling body 14 cools the cathode gas flowing through the condensed water generation flow path 132a so as to overlap the condensed water generation flow path 132a. The cooling body 14 has substantially the same height (upper and lower length in FIG. 2) and thickness (depth length in FIG. 2) as the anode separator 12. The cooling water passage 14a through which the cooling water flows is formed between the cooling body 14 and the seal carrier. The cooling water channel 14a may be configured so that the cooling water does not flow out to the anode gas channel 12a and the cathode channel 13a. For example, the cooling body 14 may be formed by stacking two separators in the fuel cell stacking direction, and the cooling water flow path 14a may be configured between the separators. The cooling water flowing in from the cooling water inlet manifold 22a flows through the cooling water passage 14a and flows out from the pure water outlet manifold 22b. The cooling body 14 is formed of a dense material. By using such a dense material, it is possible to prevent the antifreeze liquid from leaking into the fuel cell and poisoning the catalyst of the fuel cell even when the antifreeze liquid is used as the cooling water. Specific examples of the material include a carbon material and a metal material, but any material that can ensure conductivity, thermal conductivity, durability, and strength enough to withstand lamination can be used. The cooling body 14 and the anode separator 12 may be integrally formed using a composite material in which a dense material and a porous material are continuous.

  FIG. 3 is a view showing a cathode separator, FIG. 3 (A) is a surface facing the cathode electrode layer, and FIG. 3 (B) is a back surface thereof.

  As shown in FIG. 3A, the cathode separator 13 includes a gas supply unit 131 and a condensed water generation unit 132 on the surface facing the cathode electrode layer 11c.

  The gas supply unit 131 overlaps the cathode electrode layer 11c and supplies the cathode gas to the cathode electrode layer 11c. A cathode gas flow path 131 a is formed in the gas supply unit 131. The cathode gas flows into the cathode gas channel 131a from the cathode gas inlet manifold 23a.

  The condensed water production | generation part 132 continues downstream of the cathode gas flow path 131a of the opposing surface to the cathode electrode layer 11c. The condensed water generation unit 132 overlaps the cooling body 14. A condensed water generation flow path 132 a is formed in the condensed water generation unit 132. The condensed water generation channel 132a is a channel for condensing moisture contained in the cathode gas that has flowed through the cathode gas channel 131a. When the cathode gas flowing through the condensed water generation flow path 132a is cooled by the cooling body 14, the reaction water contained in the cathode gas is condensed.

  Further, as shown in FIG. 3B, the cathode separator 13 has a pure water flow path 13b through which pure water flows on the surface opposite to the surface facing the cathode electrode layer 11c. In the present embodiment, the pure water channel 13b is a straight channel. The pure water that has flowed in from the pure water inlet manifold 24a flows through the pure water passage 13b and flows out of the pure water outlet manifold 24b.

  FIG. 4 is a view showing a stacked state of the fuel cell stack, and corresponds to a section taken along line IV-IV in FIG.

  The present invention is characterized in that the fuel cell can be operated even under a freezing point where the reaction water generated by the catalytic reaction of the fuel cell may freeze. This will be described below.

  As described above, the anode gas flow path 12a of the anode separator 12 overlaps the anode electrode layer 11b of the MEA 11. A cooling body 14 is provided next to the anode separator 12. In the cathode separator 13, the cathode gas flow path 131a overlaps the cathode electrode layer 11c of the MEA 11, and the condensed water generation flow path 132a continues downstream of the cathode gas flow path 131a. The condensed water generation flow path 132 a of the cathode separator 13 overlaps the cooling body 14.

  With such a configuration, when the fuel cell is operated even under a freezing point where the reaction water generated by the catalytic reaction of the fuel cell may be frozen, the anode gas is supplied from the anode gas inlet manifold 21a to the anode gas flow path 12a. The gas is supplied, and the cathode gas is supplied from the cathode gas inlet manifold 23a to the cathode gas channel 131a. Then, power is generated by the catalytic reaction and heat is generated, and water (steam) is generated. The generated water (water vapor) flows downstream together with the cathode gas. And if the temperature of the cooling body 14 becomes more than the temperature which does not freeze water, liquid water will be condensed from the cathode gas which is flowing through the condensed water production | generation flow path 132a. The condensed water (liquid water) humidifies the cathode gas flowing from the cathode gas inlet manifold 23a, so that power generation can be continued. In this way, the fuel cell can be operated even under a freezing point where the reaction water generated by the catalytic reaction of the fuel cell may freeze.

  FIG. 5 is a diagram illustrating the configuration of the operation control apparatus of the fuel cell system according to the present invention.

  The operation control apparatus 100 of the fuel cell system includes an anode gas path 200, a cathode gas path 300, a pure water path 400, and a cooling water path 500, and the operation is controlled by the controller 600.

  The anode gas path 200 includes a high-pressure hydrogen tank 201 and a hydrogen pressure regulating valve 202 on the upstream side of the fuel cell stack 1, and a hydrogen circulation pump 203, a purge valve 204 on the downstream side of the fuel cell stack 1, Is provided. The high-pressure hydrogen tank 201 is a tank that stores hydrogen, which is an anode gas, in a high-pressure state. The hydrogen pressure regulating valve 202 adjusts the pressure of the high-pressure hydrogen tank 201 to an appropriate pressure. The hydrogen circulation pump 203 circulates hydrogen. A hydrogen circulation channel 205 is provided downstream of the hydrogen circulation pump 203 to supply unburned hydrogen gas to the fuel cell stack 1 again. The purge valve 204 is an impure gas such as nitrogen that permeates from the cathode electrode layer 11c to the anode electrode layer 11b through the electrolyte membrane 11a inside the fuel cell stack 1, or liquid water that has condensed in the hydrogen circulation channel. Is purged out of the system.

  The cathode gas path 300 includes a foreign matter filter 301 and a compressor 302 on the upstream side of the fuel cell stack 1, and a pressure adjustment valve 303 on the downstream side of the fuel cell stack 1. The foreign matter filter 301 removes foreign matter contained in air (cathode gas). The compressor 302 pumps air (cathode gas) and supplies it to the fuel cell stack 1. The pressure adjustment valve 303 adjusts the supply pressure of air (cathode gas).

  The pure water path 400 includes a pure water tank 401 and a pure water pump 402 on the upstream side of the fuel cell stack 1, and a purge valve 403 on the downstream side of the fuel cell stack 1. The pure water tank 401 is a tank that stores pure water. The pure water pump 402 pumps pure water stored in the pure water tank 401 to the fuel cell. The purge valve 403 purges bubbles in pure water. It is desirable to provide a coating for preventing ion elution that increases the resistance value of pure water on the surfaces of constituent pipes and components in the pure water path. Although not shown here, a pure water path may be recirculated from the downstream side of the fuel cell to the pure water tank.

  The cooling water path 500 includes a heat exchanger 501, a cooling water pump 502, a three-way valve 503, and a water temperature sensor 504. The heat exchanger 501 radiates the heat obtained by the cooling water by the condensation heat exchange inside the fuel cell to the outside air. A fan 505 that sends air to the heat exchanger 501 is provided in front of the heat exchanger 501. The cooling water pump 502 circulates cooling water. The three-way valve 503 switches between a flow path for cooling water toward the heat exchanger 501 and a flow path that bypasses the heat exchanger 501. The water temperature sensor 504 detects the cooling water temperature at the fuel cell inlet. By using an antifreeze for the cooling water, the cooling water can be circulated even in a sub-freezing environment. Although illustration is omitted, some auxiliary devices of the fuel cell system require cooling. When a fuel cell is mounted on a vehicle, there are parts that need cooling, such as a drive motor. The cooling water path 500 may also be used as a path for cooling such components. In this way, an increase in volume for the cooling water path can be suppressed, and the fuel cell can be quickly warmed up in a sub-freezing environment.

  The controller 600 controls the cooling water pump 502, the three-way valve 503, the fan 505, and the like based on signals from the current sensor 601, the voltage sensor 602, the water temperature sensor 504, and the like for grasping the operating state of the fuel cell stack 1.

  FIG. 6 is a main flowchart for explaining the operation of the operation control device of the fuel cell system according to the present invention. When the controller 600 detects the start signal, the controller 600 repeatedly executes the process of FIG. 6 every predetermined time (for example, 10 milliseconds).

  Next, a specific operation of the operation control device of the fuel cell system according to the present embodiment will be described along this flowchart.

  In step S <b> 1, the controller 600 detects the cooling water temperature Tw at the fuel cell inlet based on the signal from the water temperature sensor 504.

  In step S2, the controller 600 determines whether warm-up is necessary. Specifically, when the cooling water temperature Tw is lower than the freezing reference temperature Twf, it is determined that warm-up is necessary. The freezing reference temperature Twf is a temperature that takes into account a margin with respect to the temperature at which pure water existing inside the fuel cell freezes. If warm-up is necessary, the process proceeds to step S3, and if not, the process proceeds to step S4.

  In step S3, the controller 600 executes a warm-up control routine. Specific contents will be described later.

  In step S4, the controller 600 executes a control routine after completion of warm-up. Specific contents will be described later.

  FIG. 7 is a flowchart of a warm-up control routine.

  In step S31, the controller 600 sets the three-way valve 503 to the bypass flow path side. In this way, the coolant bypass path including the inside of the fuel cell can be warmed up.

  In step S <b> 32, the controller 600 reduces the rotation speed of the cooling water pump 502. As a result, the temperature gradient inside the fuel cell becomes large, and even if there is a frozen part, it can be thawed quickly. The rotation speed of the cooling water pump 502 may be stopped as well as decreased.

  In step S33, the controller 600 stops the fan 505. In this way, wasteful power consumption is reduced.

  FIG. 8 is a flowchart of the control routine after the completion of warm-up.

  In step S41, the controller 600 sets the rotation speed of the cooling water pump 502 to a predetermined speed. This predetermined speed is determined based on the output of the fuel cell, for example.

  In step S42, the controller 600 sets a target coolant temperature Twt at the fuel cell inlet. Specifically, for example, the cooling water inlet temperature that can secure the amount of pure water to be recovered is compared with the freezing reference temperature Twf, and the higher one is set as the target cooling water temperature Twt. By doing so, the heat dissipation to the outside air is not performed more than necessary, so that the power consumption of the fan or the like can be reduced.

  Here, a supplementary explanation will be given for a method of calculating the cooling water inlet temperature so as to ensure the amount of pure water to be collected. The amount of pure water to be recovered can be obtained by subtracting the amount of pure water generated based on the current value of the fuel cell from the amount of pure water evaporated based on the voltage value of the fuel cell, and adding a margin. . The cooling water inlet temperature is calculated by first providing a cathode gas temperature sensor, for example, at the inlet of the condensed water generator 132 of the cathode separator 13 to detect the cathode gas temperature. Assuming that the relative humidity is 100% at this cathode gas temperature, the amount of water vapor flowing into the condensed water generation unit 132 is calculated. Then, the temperature at which the amount of water vapor obtained by subtracting the amount of pure water to be recovered from the amount of water vapor is exhausted is calculated as the temperature of exhaust gas relative humidity 100%. The temperature, or the temperature taking into account the margin, is set as the cooling water inlet temperature for securing the amount of pure water to be recovered.

  Note that the amount of water vapor flowing into the condensed water generator 132 of the cathode separator 13 may be calculated on the assumption that all the calorific value estimated from the voltage of the fuel cell has been used for water evaporation.

  In step S43, the controller 600 determines whether or not the water temperature Tw has reached the target cooling water temperature Twt. The process proceeds to step S44 until it reaches, and when it reaches, the process proceeds to step S45.

  In step S44, the controller 600 sets the three-way valve 503 to the bypass flow path side.

  In step S45, the controller 600 sets the three-way valve 503 to the heat exchanger side.

  In step S46, the controller 600 detects the opening degree θ of the three-way valve 503.

  In step S47, the controller 600 determines whether or not the opening degree θ of the three-way valve 503 has reached the maximum opening degree θmax. The process once exits until it reaches, and when it reaches, the process proceeds to step S48.

  In step S48, the controller 600 rotates the fan 505. The rotational speed of the fan may be adjusted according to the coolant temperature Tw at the fuel cell inlet.

  According to this embodiment, the cooling body is formed inside the fuel cell. The cooling water is circulated by bypassing the heat exchanger until the temperature of the cooling water flowing through the cooling body exceeds the temperature at which the pure water existing inside the fuel cell is likely to freeze. Can warm up. In a fuel cell, electric power is generated by a catalytic reaction to generate heat, and water (steam) is generated. The generated water (water vapor) flows downstream together with the cathode gas. At this time, since the temperature of the cooling body is equal to or higher than the temperature at which water is not frozen, liquid water is condensed from the cathode gas flowing in the condensed water generation flow path. Since this condensed water (liquid water) humidifies the cathode gas flowing from the cathode gas inlet manifold, power generation can be continued. In this way, the fuel cell can be operated even at a temperature below freezing point where the reaction water generated by the catalytic reaction of the fuel cell may freeze.

  Without being limited to the embodiments described above, various modifications and changes are possible within the scope of the technical idea, and it is obvious that these are also included in the technical scope of the present invention.

  For example, in the above description, the anode separator 12 and the cathode separator 13 have been described as having the type in which the reaction gas channel is formed on one side and the cooling water channel is formed on the opposite side, but as shown in FIG. The concave portion on one side and the concave portion on the opposite side are alternately arranged in a concavo-convex shape, where the concave portion on one side is a gas flow path 12a, 13a for flowing a reaction gas, and the concave portion on the opposite side is a pure water flow path for flowing pure water. Waveform separators 12b and 13b may be used.

It is sectional drawing which shows the fuel cell stack used for the fuel cell system by this invention. It is a figure which shows an anode separator. It is a figure which shows a cathode separator. It is sectional drawing which shows the lamination | stacking state of a fuel cell stack. It is a figure explaining the structure of the operation control apparatus of the fuel cell system by this invention. 3 is a main flowchart for explaining the operation of the operation control device of the fuel cell system according to the present invention. It is a flowchart of a warm-up control routine. It is a flowchart of the control routine after completion of warming up. It is sectional drawing which shows another form of a separator.

Explanation of symbols

1 Fuel cell stack 10 Power generation cell 11 MEA
11a Electrolyte membrane 11b Anode electrode layer 11c Cathode electrode layer 12 Anode separator (first separator)
12a Anode gas channel (first gas channel)
12b Pure water flow path 13 Cathode separator (second separator)
131 Gas supply part 131a Cathode gas flow path (second gas flow path)
132 Condensate Water Generation Unit 132a Condensate Water Generation Channel 13b Pure Water Channel 14 Cooling Body 14a Cooling Water Channel 100 Fuel Cell System Operation Control Device 200 Anode Gas Path 300 Cathode Gas Path 400 Pure Water Path 500 Cooling Water Path 501 Heat Exchanger 502 Cooling water pump (cooling water amount adjusting means)
503 Three-way valve (flow path switching means)
504 Water temperature sensor (water temperature detection means)
505 Fan (Air volume adjustment means)
600 controller

Claims (9)

An operation control device for a fuel cell system using a polymer electrolyte fuel cell,
With a cooling water path that can adjust the temperature of the cooling water so that the pure water present inside the fuel cell does not freeze,
The polymer electrolyte fuel cell is
An anode electrode layer provided on one surface of the electrolyte membrane and a seal carrier adjacent to the anode electrode layer ;
A cathode electrode layer provided on the other surface of the electrolyte membrane;
An anode separator that includes an anode gas flow path that overlaps the anode electrode layer and supplies anode gas to the anode electrode layer;
A cooling body that is adjacent to the anode separator, overlaps with the seal carrier, and through which the cooling water supplied from the cooling water passage flows between the seal carrier ;
A cathode gas supply section in which a cathode gas flow path for supplying a cathode gas to the cathode electrode layer is formed, and is provided at a position continuous with the cooling body continuously downstream of the cathode gas flow path. A cathode separator comprising: a condensed water generating unit that condenses moisture contained in the cathode gas flowing through the cathode gas flow path and humidifies the cathode gas flowing into the cathode gas flow path with the moisture;
An operation control apparatus for a fuel cell system, comprising: The cooling water path is
A heat exchanger that communicates with the cooling body and enables heat exchange between the cooling water flowing from the cooling body and the outside air;
An air volume adjusting means for adjusting an air volume sent to the heat exchanger;
A cooling water amount adjusting means for adjusting a flow rate of the cooling water circulating through the heat exchanger;
A flow path switching means for switching the flow path of the cooling water toward the heat exchanger and the flow path bypassing the heat exchanger;
Water temperature detecting means for detecting the cooling water inlet temperature of the cooling water flowing into the cooling body;
With
Further comprising a cooling water path control means for controlling the operation of the air volume adjusting means, the cooling water amount adjusting means or the flow path switching means based on the detected cooling water inlet temperature.
The operation control apparatus for a fuel cell system according to claim 1. The cooling water path control means stops the air volume adjusting means when the detected cooling water inlet temperature is lower than the temperature at which the pure water existing in the fuel cell is likely to freeze, or the cooling water Controlling the water amount adjusting means to reduce the flow rate of the cooling water, or controlling the flow path switching means to flow the cooling water to the bypass flow path;
The operation control apparatus for a fuel cell system according to claim 2. The cathode separator is formed on the back surface of the gas channel surface, and has a pure water channel through which pure water flows.
The reaction gas pressure of the condensed water generation unit is higher than the pure water pressure of the pure water flow path.
The operation control device for a fuel cell system according to any one of claims 1 to 3 , wherein the operation control device is a fuel cell system. The anode separator or cathode separator has a concavo-convex shape in which concave portions on one side and concave portions on the opposite side are alternately arranged, the concave portion on one side is a gas flow path for flowing a reaction gas, and the concave portion on the opposite side is filled with pure water. It is a pure water flow channel
The operation control device for a fuel cell system according to any one of claims 1 to 4 , wherein the operation control device is a fuel cell system. The cooling body is formed of a dense material that does not leak cooling water flowing inside.
The operation control device for a fuel cell system according to any one of claims 1 to 5 , wherein the operation control device is a fuel cell system. The anode separator is formed of a porous material,
The cooling body is formed of a dense material,
The anode separator and the cooling body are integrally formed so as to be continuous.
The operation control device for a fuel cell system according to any one of claims 1 to 6 , wherein the operation control device is a fuel cell system. The cooling water is an antifreeze.
The operation control device for a fuel cell system according to any one of claims 1 to 7 , wherein the operation control device is a fuel cell system. An anode electrode layer provided on one surface of the electrolyte membrane and a seal carrier adjacent to the anode electrode layer ;
A cathode electrode layer provided on the other surface of the electrolyte membrane;
An anode separator that includes an anode gas flow path that overlaps the anode electrode layer and supplies anode gas to the anode electrode layer;
A cooling body that is adjacent to the anode separator, overlaps with the seal carrier, and through which the cooling water supplied from the cooling water passage flows between the seal carrier ;
A cathode gas supply section in which a cathode gas flow path for supplying a cathode gas to the cathode electrode layer is formed, and is provided at a position continuous with the cooling body continuously downstream of the cathode gas flow path. A cathode separator comprising: a condensed water generating unit that condenses moisture contained in the cathode gas flowing through the cathode gas flow path and humidifies the cathode gas flowing into the cathode gas flow path with the moisture;
A polymer electrolyte fuel cell comprising:
A heat exchanger that communicates with the cooling body and enables heat exchange between the cooling water flowing from the cooling body and the outside air;
An air volume adjusting means for adjusting an air volume sent to the heat exchanger;
A cooling water amount adjusting means for adjusting a flow rate of the cooling water circulating through the heat exchanger;
A flow path switching means for switching the flow path of the cooling water toward the heat exchanger and the flow path bypassing the heat exchanger;
Water temperature detecting means for detecting the cooling water inlet temperature of the cooling water flowing into the cooling body;
A cooling water path including
An operation control device for a fuel cell system comprising:
When the detected cooling water inlet temperature is lower than the temperature at which the pure water existing inside the fuel cell is likely to freeze, the air volume adjusting means is stopped or the cooling water volume adjusting means is controlled to cool. A warm-up control step of reducing the flow rate of water, or controlling the flow path switching means to flow the cooling water to the bypass flow path;
When the detected cooling water inlet temperature is higher than the temperature at which the pure water existing inside the fuel cell is likely to freeze, the cooling water amount adjusting means is controlled to cool with the water amount based on the output of the fuel cell. When the cooling water inlet temperature is lower than the target cooling water temperature in the state where water is further flown and the cooling water is flowing, the flow path switching means is controlled to flow the cooling water to the bypass flow path, and the cooling water inlet When the temperature is higher than the target cooling water temperature, a control step after the warm-up is completed in which the flow path switching unit is controlled to flow the cooling water to the heat exchanger;
An operation control method for a fuel cell system, comprising:

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