JP2010140678A - Fuel cell cooling system - Google Patents

Abstract

A fuel cell cooling system capable of reducing warm-up time is provided.
A third flow path for warming up the auxiliary machine by flowing a refrigerant so as to exchange heat with the auxiliary machine of the fuel cell, and whether or not the refrigerant flows through the third flow path. And a switching valve control means for controlling the switching valve 7 on the downstream side of the auxiliary machine 20 based on the refrigerant temperature and controlling the flow rate of the refrigerant flowing through the third flow path 13. The switching valve control means controls the switching valve 7 to cause the refrigerant to flow through the third flow path 13 until the temperature exceeds a predetermined temperature at which it is determined that the freezing of the auxiliary machine 20 has been eliminated. .
[Selection] Figure 1

Description

  The present invention relates to a fuel cell cooling system.

  In recent years, a polymer electrolyte fuel cell (Polymer Electrolyte Fuel Cell) that generates electricity by supplying hydrogen (fuel gas, reactive gas) to the anode and oxygen-containing air (oxidant gas, reactive gas) to the cathode, respectively. The development of fuel cells such as PEFC is active. In a system including such a fuel cell, a cooling system using a radiator is used to cool the fuel cell stack (see, for example, Patent Document 1).

  In this cooling system, the refrigerant is circulated between the motor and the auxiliary equipment provided in the fuel cell, and the auxiliary equipment is warmed up using the waste heat of the motor.

JP 2004-158371 A

However, in the above-described conventional cooling system, since the refrigerant is circulated between the motor and the auxiliary machine to warm up the auxiliary machine, the temperature of the auxiliary machine rises until the temperature of the motor rises. However, there was a problem that the temperature of the fuel cell and the temperature of the auxiliary machine did not rise synchronously.
In addition, since it is in the stage where the determination of the completion of warm-up is later, there is a problem that it takes time to warm up the entire system.

  Accordingly, an object of the present invention is to provide a fuel cell cooling system capable of shortening the warm-up time.

  In order to achieve the above object, a fuel cell cooling system according to the present invention includes a fuel cell, a radiator that performs heat exchange of a refrigerant that cools the fuel cell, and a first refrigerant that is introduced from the radiator to the fuel cell. A bypass flow for connecting a flow path, a second flow path for deriving the refrigerant from the fuel cell to the radiator, the first flow path and the second flow path, and bypassing the radiator to flow the refrigerant A cooling system for a fuel cell, comprising: a passage; a circulation pump for causing the refrigerant to flow; and a bypass passage switching means for switching whether or not the refrigerant is caused to flow to the bypass passage based on a temperature of the refrigerant. The one end is connected to the upstream side of the second flow path, and the other end is the downstream side of the second flow path, the bypass flow path, and the downstream side of the bypass flow path. Any of one flow path A third flow path for warming the auxiliary equipment by flowing a refrigerant so as to exchange heat with the auxiliary equipment of the fuel cell, and whether to let the refrigerant flow through the third flow path. A switching valve for switching, a first temperature detecting means for detecting the temperature of the auxiliary machine, and the switching valve is controlled based on the temperature detected by the first temperature detecting means to flow through the third flow path. Switching valve control means for controlling the flow rate of the refrigerant, and the switching valve control means has a predetermined temperature at which the temperature detected by the first temperature detection means is determined that the auxiliary machine has been freed from freezing. The switching valve is controlled to cause the refrigerant to flow through the third flow path until the temperature exceeds the temperature.

  According to the fuel cell cooling system, one end of the third flow path for warming up the fuel cell auxiliary device is connected to the upstream side of the second flow path, and the other end is the downstream side of the second flow path. , The bypass flow path, and the first flow path downstream of the bypass flow path. When the switching valve is switched by the switching valve control means, the refrigerant discharged from the fuel cell is third. The auxiliary flow is warmed up together with the fuel cell. As a result, the fuel cell and the auxiliary machine can be warmed up only by using the waste heat of the fuel cell. Moreover, since the auxiliary machine can be warmed up using the waste heat of the fuel cell, efficient warming up can be performed. As a result, the warm-up time of the entire system can be shortened.

  The switching valve control means controls the switching valve until the temperature detected by the first temperature detection means exceeds a predetermined temperature at which it is determined that the auxiliary machine has been frozen. Since the refrigerant is allowed to flow through, the freezing of the auxiliary device is suitably eliminated in accordance with the temperature rise of the fuel cell, and the warm-up time can be shortened.

  The present invention further includes a second temperature detecting means for detecting the temperature of the fuel cell, and a flow rate control means for controlling the flow rate of the circulating refrigerant, and the temperature detected by the first temperature detecting means. Until the temperature exceeds the predetermined temperature, the flow rate control means determines the rate of temperature rise of the fuel cell and the temperature based on the temperatures detected by the first temperature detection means and the second temperature detection means. It is preferable that the flow rate of the circulating refrigerant be controlled so that the temperature increase rate of the auxiliary machine matches.

  According to this fuel cell cooling system, the temperature increase rate of the fuel cell and the temperature increase rate of the auxiliary machine are matched until the temperature exceeds a predetermined temperature at which it is determined that the freezing of the auxiliary machine has been resolved. Since the flow rate of the circulating refrigerant is controlled, it is possible to perform efficient warm-up with reduced waste, and the warm-up is promoted while the heat capacity required for warm-up is reduced. Energy consumption can be reduced.

  ADVANTAGE OF THE INVENTION According to this invention, the cooling system of the fuel cell which can aim at shortening of warm-up time is obtained.

Hereinafter, embodiments of the present invention will be described with reference to the drawings as appropriate.
In FIG. 1, a fuel cell cooling system according to the present embodiment cools a fuel cell system 1 mounted on a fuel cell vehicle (moving body) (not shown). The fuel cell system 1 is used as an object to be cooled. Fuel cell stack 2, anode system for supplying and discharging hydrogen (fuel gas, reaction gas) to and from anode of fuel cell stack 2, and oxygen-containing air (oxidant gas and reaction) to cathode of fuel cell stack 2 And a cathode system for supplying and discharging gas).

The fuel cell stack 2 is a stack configured by stacking a plurality of solid polymer type single cells, and the plurality of single cells are electrically connected in series. The single cell includes an MEA (Membrane Electrode Assembly) and two conductive anode separators and cathode separators sandwiching the MEA.
A driving motor M is connected to the fuel cell stack 2.

  A coolant passage 2a through which coolant as a coolant flows is formed inside the fuel cell stack 2, and a coolant circulation means for supplying the coolant while circulating the coolant to the fuel cell stack 2 is connected to the coolant passage 2a. In addition, as cooling water, cooling water, such as a long life coolant, can be used, for example. In the following description, “upstream” and “downstream” are based on the direction in which the cooling water flows.

The refrigerant circulation means mainly includes a fuel cell circulation system 3A for cooling (warming up) the fuel cell stack 2 and an auxiliary machine circulation system 3B for warming up the auxiliary machine 20 connected to the fuel cell stack 2. ing.
The auxiliary machine 20 connected to the fuel cell stack 2 includes a shut-off valve, a pressure reducing valve, a humidifier, an ejector, a purge valve, a scavenging gas discharge valve, a gas-liquid separator, a diluter, and these devices (not shown). A pipe connected to the pipe, a drain pipe, and the like.
The shut-off valve is a valve that shuts off hydrogen supplied from the hydrogen tank to the fuel cell stack 2.
The fuel cell circulation system 3A includes a radiator 4 that performs heat exchange of the cooling water, a first flow path 11 that introduces cooling water from the radiator 4 to the fuel cell stack 2, and a cooling water that is led from the fuel cell stack 2 to the radiator 4. The second flow path 12 to be connected, the first flow path 11 and the second flow path 12 are connected, the bypass flow path 15 through which the cooling water flows by bypassing the radiator 4, and the cooling water to flow therethrough A circulation pump 5 provided in the first flow path 11, a thermostat 6 as bypass flow path switching means for switching whether or not cooling water flows to the bypass flow path 15 based on the temperature of the cooling water, a fuel cell And a second temperature sensor 9 as second temperature detecting means for detecting the temperature of the cooling water discharged from the stack 2.

The first flow path 11 is composed of pipes 11a to 11c. Cooling water from the radiator 4 is introduced into the circulation pump 5 through the pipe 11a, the thermostat 6 and the pipe 11b, and from the circulation pump 5 to the fuel cell stack 2 through the pipe 11c. Supplied.
On the other hand, the second flow path 12 includes pipes 12a and 12b, and the cooling water discharged from the fuel cell stack 2 passes through the pipe 12a, the switching valve 7 (three-way valve) and the pipe 12b, which will be described later, of the auxiliary circulation system 3B. It is introduced to the radiator 4.
That is, starting from the circulation pump 5, the fuel cell stack 2 is connected to the downstream side of the circulation pump 5 through the pipe 11c, and the switching valve 7 is connected to the downstream side of the fuel cell stack 2 through the pipe 12a. A radiator 4 is connected to the downstream side of the valve 7 through a pipe 12b, a thermostat 6 is connected to the downstream side of the radiator 4 through a pipe 11a, and a circulation pump 5 is connected to the downstream side of the thermostat 6 through a pipe 11b. Is connected.

The second temperature sensor 9 is provided in the pipe 12 a of the second flow path 12 and detects the temperature of the cooling water discharged from the fuel cell stack 2. The second temperature sensor 9 sends the detected temperature to an ECU (Electronic Control Unit) 30 which will be described later. The temperature detected by the second temperature sensor 9 is approximately equal to the temperature of the fuel cell stack 2. For this reason, it is desirable to arrange the second temperature sensor 9 in the vicinity of the outlet of the fuel cell stack 2 (upstream side of the pipe 12a).
Further, the second temperature sensor 9 is disposed on the upstream side of the piping 13a of the auxiliary equipment circulation system 3B described later, that is, on the upstream side of the auxiliary equipment 20, and the cooling water discharged from the fuel cell stack 2. The temperature may be detected.
Further, the second temperature sensor 9 may be attached to the fuel cell stack 2 so that the temperature of the fuel cell stack 2 can be directly detected by the second temperature sensor 9, or the anode off gas discharged from the fuel cell stack 2 or The temperature of the fuel cell stack 2 may be detected from the temperature of the cathode off gas.

  The bypass flow path 15 is configured by connecting a pipe 15a between the pipe 12b on the downstream side of the fuel cell stack 2 and the thermostat 6, and between the upstream side and the downstream side of the radiator 4, Specifically, the upstream side of the radiator 4 on the downstream side of the fuel cell stack 2 and the upstream side of the circulation pump 5 on the downstream side of the radiator 4 are connected by a pipe 15 a and a thermostat 6. That is, the pipe 15 a is branched from the pipe 12 b and bypasses the radiator 4, and the cooling water flowing therethrough is joined to the pipe 11 b via the thermostat 6.

The radiator 4 exchanges heat with the outside air via the cooling water flowing through the pipe 12b, and radiates heat from the fuel cell stack 2.
The circulation pump 5 pumps the cooling water in the clockwise direction in FIG. 1, that is, pumps the cooling water to the refrigerant passage 2a of the fuel cell stack 2 through the pipe 11c, and an ECU 30 (flow rate control means) which will be described later. It is driven by the command. In addition, the circulation pump 5 can be variably controlled in discharge flow rate by changing the rotation speed. In the present embodiment, the circulation pump 5 is variably controlled by a command from the ECU 30 described later.

The thermostat 6 controls the flow direction of the cooling water following the temperature of the cooling water, and a known wax pellet type utilizing thermal expansion of a thermal expansion body (wax) (not shown) can be used. . The thermostat 6 communicates between the pipe 15a and the pipe 11b when the temperature of the cooling water flowing in through the pipe 15a is lower than the operating temperature (mainly during warm-up), and the inflowing cooling water. When the temperature is equal to or higher than the operating temperature (during normal operation in which normal power generation is performed), the flow is switched between the pipe 11a and the pipe 11b.
Therefore, during the warm-up operation of the fuel cell stack 2, the cooling water flows from the pipe 15 a to the pipe 11 b through the thermostat 6, and a cooling water flow path bypassing the radiator 4 is formed. ing.

  The auxiliary circulation system 3B has a third flow path having one end (upstream end) connected to the upstream side of the second flow path 12 and the other end (downstream end) connected to the downstream side of the second flow path 12. 13, a switching valve 7 for switching whether or not to allow the cooling water to flow through the third flow path 13, and a first temperature as a first temperature detecting means for detecting the temperature of the cooling water on the downstream side of the auxiliary machine 20. Sensor 8.

The third flow path 13 is configured by connecting a pipe 13 a between the switching valve 7 and the downstream side of the pipe 12 b, and the cooling discharged from the fuel cell stack 2 on the downstream side of the fuel cell stack 2. It plays a role of allowing water to flow through the auxiliary valve 20 via the switching valve 7 so that heat can be exchanged.
Alternatively, the switching valve 7 may be arranged in the vicinity of the outlet of the fuel cell stack 2 so that the upstream side of the pipe 13a approaches the vicinity of the outlet of the fuel cell stack 2. By comprising in this way, the cooling water heated through the fuel cell stack 2 can be flowed suitably through the piping 13a.
The middle of the pipe 13a is guided to the auxiliary machine 20, and the main body of the auxiliary machine 20 and the casing constituting the auxiliary machine 20 are configured so that heat exchange with the auxiliary machine 20 can be performed by the flowing cooling water. It is connected to a support or the like.
Further, the downstream end of the pipe 13 a is connected to the upstream portion of the joining point 15 b to which the pipe 15 a of the bypass flow path 15 is connected in the pipe 12 b of the second flow path 12.
The downstream end of the pipe 13a may be connected to the flow path bypassing the radiator 4, and may be connected to the pipe 12b on the downstream side of the junction 15b, or may be connected to the pipe 15a of the bypass flow path 15. You may connect. Further, it may be connected to the pipe 11 b of the first flow path 11 on the downstream side of the bypass flow path 15.

The 1st temperature sensor 8 is provided in the piping 13a of the 3rd flow path 13, and detects the temperature of the cooling water after heat exchange with the auxiliary machine 20. As shown in FIG. The first temperature sensor 8 sends the detected temperature to the ECU 30 described later. The temperature detected by the first temperature sensor 8 is substantially equal to the temperature of the auxiliary machine 20. For this reason, it is desirable to arrange the first temperature sensor 8 in the pipe 13a in the vicinity of the auxiliary machine 20.
Note that the first temperature sensor 8 may be attached to the auxiliary machine 20 so that the temperature of the auxiliary machine 20 is directly detected by the first temperature sensor 8.

  The switching valve 7 is a three-way valve, and the flow of the cooling water discharged from the fuel cell stack 2 through the pipe 12a flows to the auxiliary machine 20 (in the direction of arrow A1 in the figure) and bypasses the auxiliary machine 20. Switch to direction (arrow A2 direction in the figure). In the present embodiment, switching of the switching valve 7 is performed by control of an ECU 30 (switching valve control means) which will be described later. That is, as will be described later, when the ECU 30 determines that the warm-up operation of the auxiliary machine 20 is necessary during the warm-up operation after the IG 40 is turned ON, the switching valve 7 causes the coolant to flow in the direction of the arrow A1 in the figure. The cooling water that is switched to flow and discharged from the fuel cell stack 2 is supplied to the auxiliary machine 20 through the pipe 13a. Thereby, the auxiliary machine 20 is warmed up. Further, as will be described later, when the ECU 30 determines that the warm-up operation of the auxiliary machine 20 has been completed, the switching water is switched by the switching valve 7 so that the cooling water flows in the direction of the arrow A2, and the cooling water flows in the second flow. It flows to the pipe 12b on the path 12 side.

The ECU 30 is a control device that electronically controls the fuel cell cooling system, and includes a CPU, a ROM, a RAM, various interfaces, an electronic circuit, and the like, and various devices according to programs stored therein. Are controlled to execute various processes.
The ECU 30 has flow rate control means and switching valve control means.

(Operation of fuel cell cooling system)
Next, the operation of the fuel cell cooling system will be described with reference to FIG. 2 together with the flow of a program (flow chart) set in the ECU 30.
When the IG 40 is turned on, the process shown in the flowchart of FIG. 2 starts. Further, the circulation pump 5 is stopped before the IG 40 is turned on (initial state). When the IG 40 is turned on, the ECU 30 detecting this ON signal operates the circulation pump 5 to circulate the cooling water. In parallel with this, the ECU 30 supplies hydrogen from a hydrogen tank (not shown) and air containing oxygen from a compressor (not shown) to the fuel cell stack 2 and then causes the fuel cell stack 2 to generate power. Then, with the power generation, the fuel cell stack 2 self-heats, and the temperature of the cooling water discharged from the fuel cell stack 2 starts to gradually increase.

In step S101, the ECU 30 inputs the temperature T1 detected by the first temperature sensor 8, and determines whether or not the auxiliary machine 20 has reached the de-icing temperature from the cooling water temperature T1 on the downstream side of the auxiliary machine 20. judge.
Specifically, when the temperature T1 of the cooling water is equal to or lower than a predetermined temperature at which it is determined that the freezing of the auxiliary machine 20 has been eliminated, it is determined that the auxiliary machine 20 needs to be warmed up.
Here, the predetermined temperature is determined that there is a possibility that the interior of the auxiliary machine 20 is frozen when the temperature T1 of the cooling water is equal to or lower than the predetermined temperature, and the auxiliary machine 20 needs to be warmed up. Temperature.
The predetermined temperature is obtained by a preliminary test or the like and stored in the ECU 30 in advance.

  When it is determined that the auxiliary machine 20 needs to be warmed up (S101, No), the process of the ECU 30 proceeds to step S102. On the other hand, if it is determined that the auxiliary machine 20 does not need to be warmed up (S101 / Yes), the process of the ECU 30 proceeds to step S105.

In step S <b> 102, the ECU 30 performs control to circulate cooling water via the auxiliary machine 20. That is, the ECU 30 (switching valve control means) controls the switching valve 7 so that the cooling water discharged from the fuel cell stack 2 flows in the direction of the arrow A1 in FIG. Drive in mode. Thereby, the cooling water (warmed cooling water) discharged from the fuel cell stack 2 flows into the pipe 13a of the third flow path 13 through the switching valve 7 from the pipe 12a, and the cooling water moves the pipe 13a downstream. It begins to flow toward. In the course of flowing through the pipe 13 a, the cooling water is heat exchanged with the auxiliary machine 20.
The cooling water that has flowed through the pipe 13a in this way joins the pipe 12b and is introduced from the pipe 15a of the bypass passage 15 through the thermostat 6 to the circulation pump 5 through the pipe 11b.
When the fuel cell stack 2 is warmed up by the warm-up operation, the temperature of the circulating cooling water starts to rise, and the warm-up of the auxiliary machine 20 is promoted.

In step S103, the ECU 30 inputs the temperature T2 detected by the second temperature sensor 9. Further, in step S104, the ECU 30 raises the temperature of the fuel cell stack 2 from the temperature T2 and the previously input temperature T1. The flow rate of the circulating refrigerant is controlled so that the speed matches the temperature increase rate of the auxiliary machine 20.
Specifically, the ECU 30 (flow rate control means) obtains the temperature rise amount ΔT2 (° C./hour) on the fuel cell stack 2 side from the temperature T2, and also the temperature rise amount ΔT1 (° C./hour) on the auxiliary device 20 side from the temperature T1. From these values, the flow rate of the circulating cooling water is controlled by controlling the rotational speed of the circulation pump 5.

As shown in FIG. 3, the ECU 30 determines the difference between the temperature rise ΔT2 (° C./hour) on the fuel cell stack 2 side and the temperature rise ΔT1 (° C./s) on the auxiliary machine 20 side, and the rotation of the circulation pump 5. A map showing the relationship between the number (rpm) and the flow rate control means provided in the ECU 30 controls the flow rate of the cooling water based on this map.
In this example, for example, when the absolute value of the difference obtained by subtracting the temperature rise amount ΔT1 (° C./s) from the temperature rise amount ΔT2 (° C./s) is large, the rotational speed (rpm) of the circulation pump 5 is increased. On the contrary, when the difference is small, the rotational speed (rpm) of the circulation pump 5 is set to be low. That is, when the temperature rise amount ΔT2 (° C./s) on the fuel cell stack 2 side is larger than the temperature rise amount ΔT1 on the auxiliary machine 20 side, the rotational speed (rpm) of the circulation pump 5 is set to the higher side. On the contrary, when the temperature rise amount ΔT2 (° C./s) on the fuel cell stack 2 side is smaller than the temperature rise amount ΔT1 on the auxiliary machine 20 side, the rotational speed (rpm) of the circulation pump 5 is low. Is set on the side.

  After such control, if it is determined in step S101 that the auxiliary machine 20 does not need to be warmed up (No in S101), the process of the ECU 30 proceeds to step S105, and the switching valve control means provided in the ECU 30 Controls the switching valve 7 so that the cooling water discharged from the fuel cell stack 2 flows in the direction of the arrow A2 in FIG. 1, and the warm-up operation is performed in the normal warm-up mode with the auxiliary device 20 bypassed. To do.

Then, the process of the ECU 30 proceeds to step S106, and the rotational speed of the circulation pump 5 is returned to the control by the normal rotational speed by the flow rate control means provided in the ECU 30.
Thereafter, when the fuel cell stack 2 rises to a predetermined temperature, the thermostat 6 controls the flow direction of the cooling water following the temperature of the cooling water, and is switched to circulation via the radiator 4.

  According to the fuel cell cooling system of the present embodiment described above, when the switching valve 7 is switched by the switching valve control means provided in the ECU 30, the cooling water discharged from the fuel cell stack 2 passes through the third flow path 13. As a result, the auxiliary machine 20 is warmed up together with the fuel cell stack 2. As a result, the fuel cell stack 2 and the auxiliary machine 20 can be warmed up only by using the waste heat of the fuel cell stack 2. Moreover, since the auxiliary machine 20 can be warmed up using the waste heat of the fuel cell stack 2, efficient warming up can be performed. As a result, the warm-up time of the entire system can be shortened.

  The switching valve control means provided in the ECU 30 controls the switching valve 7 until the temperature T1 detected by the first temperature sensor 8 exceeds a predetermined temperature at which it is determined that the freezing of the auxiliary machine 20 has been eliminated. Since the cooling water is caused to flow through the three flow paths 13, freezing of the auxiliary machine 20 is preferably eliminated as the temperature of the fuel cell stack 2 rises, and the warm-up time can be shortened.

  Further, the temperature increase rate of the fuel cell stack 2 and the temperature increase rate of the auxiliary machine 20 coincide with each other until the temperature exceeds a predetermined temperature at which it is determined that the freezing of the auxiliary machine 20 has been eliminated by the flow rate control means provided in the ECU 30. As described above, since the discharge flow rate of the circulation pump 5 is controlled, efficient warm-up with reduced waste can be performed, and the warm-up is promoted while the heat capacity necessary for warm-up is reduced. It is possible to reduce energy consumption until completion of warm-up.

  In the above-described embodiment, a three-way valve is used as the switching valve 7, but is not limited to this, and at least upstream of the auxiliary machine 20 in the pipe 12 b of the second flow path 12 and the pipe 13 a of the third flow path 13. On the side, an on-off valve may be provided, and the opening and closing of these valves may be controlled in conjunction with each other so that the flows in the directions indicated by arrows A1 and A2 in FIG. 1 are generated.

  Further, in the above-described embodiment, the flow rate control means provided in the ECU 30 is configured to control the discharge flow rate of the circulation pump 5. However, the present invention is not limited to this, and refrigerant is not supplied to the pipe 11 c of the first flow path 11. A butterfly valve capable of controlling the flow rate is arranged, and the flow rate of the circulating cooling water is controlled by controlling the opening / closing angle of the valve of the butterfly valve by the flow rate control means provided in the ECU 30. Also good.

  Moreover, you may comprise so that cooling water may be simultaneously flowed in both the arrow A1 direction and the arrow A2 direction in FIG. In this case, the cooling water may be allowed to flow simultaneously in both directions by using a switching valve 7 '(not shown) that can change the flow rate ratio.

It is the schematic which shows the cooling system of the fuel cell which concerns on one Embodiment of this invention. It is a flowchart for demonstrating operation | movement of the cooling system of a fuel cell. It is a map showing the relationship between the temperature rise amount and the rotation speed of the circulation pump.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fuel cell system 2 Fuel cell stack 4 Radiator 5 Circulation pump 6 Thermostat (Bypass flow path switching means)
7 switching valve 8 first temperature sensor (first temperature detecting means)
9 Second temperature sensor (second temperature detection means)
11 1st flow path 12 2nd flow path 13 3rd flow path 15 Bypass flow path 20 Auxiliary machine 30 ECU (switching valve control means, flow control means)
T1 temperature (corresponding to auxiliary equipment)
T2 temperature (temperature corresponding to fuel cell stack)

Claims (2)

A fuel cell, a radiator for exchanging heat of the refrigerant for cooling the fuel cell, a first flow path for introducing the refrigerant from the radiator to the fuel cell, and a second flow for deriving the refrigerant from the fuel cell to the radiator A bypass passage for connecting the passage, the first passage and the second passage, bypassing the radiator and flowing the refrigerant, a circulation pump for passing the refrigerant, and the bypass passage A bypass flow path switching means for switching whether or not the refrigerant is allowed to flow based on the temperature of the refrigerant, and a cooling system for a fuel cell,
One end of the first flow path is connected to the upstream side of the second flow path, and the other end is downstream of the second flow path, the bypass flow path, and the downstream of the bypass flow path. A third flow path that is connected to any one of the fuel cell and heats the auxiliary device by passing a refrigerant so as to exchange heat with the auxiliary device of the fuel cell;
A switching valve for switching whether to allow the refrigerant to flow through the third flow path;
First temperature detecting means for detecting the temperature of the auxiliary machine;
Switching valve control means for controlling the switching valve based on the temperature detected by the first temperature detection means and controlling the flow rate of the refrigerant flowing through the third flow path,
The switching valve control means controls the switching valve until the temperature detected by the first temperature detection means exceeds a predetermined temperature at which it is determined that freezing of the auxiliary machine has been eliminated. A cooling system for a fuel cell, characterized by causing a refrigerant to flow through a third flow path. Second temperature detection means for detecting the temperature of the fuel cell;
A flow rate control means for controlling the flow rate of the circulating refrigerant,
Until the temperature detected by the first temperature detecting means reaches a temperature exceeding the predetermined temperature,
The flow rate control means is configured so that the temperature increase rate of the fuel cell and the temperature increase rate of the auxiliary machine coincide with each other based on the temperatures detected by the first temperature detection means and the second temperature detection means. 2. The fuel cell cooling system according to claim 1, wherein the flow rate of the circulating refrigerant is controlled.

Images