JP5162091B2 - Fuel cell system - Google Patents

Description

  The present invention relates to a fuel cell system that circulates a refrigerant to cool a fuel cell, and more particularly to a fuel cell system that raises the refrigerant temperature when the fuel cell system is stopped according to the outside air temperature.

  Fuel cell technology is attracting attention as a power source or power source that enables clean exhaust and high energy efficiency against recent environmental problems, especially air pollution caused by automobile exhaust and global warming caused by carbon dioxide. ing.

  A fuel cell supplies hydrogen or a gas with a high hydrogen concentration as fuel and oxygen or oxygen-containing air as an oxidant to a stack that is a composite of an electrolyte membrane and an electrode catalyst, and performs an electrochemical reaction. It is an energy conversion system that wakes up and converts chemical energy into electrical energy.

  Among such fuel cell systems, a solid polymer electrolyte fuel cell having a particularly high power density is generally controlled so that the stack temperature is 85 ° C. or lower. Therefore, a heat exchanger such as a radiator and the like In many cases, a water circulation system including a water circulation pump and a fuel cell are connected by a pipe and cooled with cooling water.

  However, when a fuel cell system equipped with such a water circulation system is installed in a low-temperature environment such as outdoors in a cold region, if the fuel cell system is not operated for a certain period of time, the water in the fuel cell and the water circulation system will freeze and become inoperable. Or the expansion pressure when water freezes can damage the system.

  Therefore, conventionally, when the outside air temperature decreases, the fuel cell is started to generate heat and control to prevent freezing is performed. As a conventional example of such a fuel cell system, for example, JP-A-11-214025 No. 1 (Patent Document 1) is disclosed.

In this conventional example, the freeze prevention mode is set by the operation mode switching signal from the operation panel, and at the time of setting the freeze prevention mode, it is determined by the detection signal from the temperature sensor that the temperature outside the apparatus is below a predetermined threshold value. Then, the driving and stopping of the fuel cell are controlled to generate heat corresponding to the outside air temperature from the fuel cell. The heat generated in the fuel cell is transferred to the water circulating between the fuel cell and the main tank, and the circulating water is maintained at a high temperature to prevent freezing even when the outside air temperature is 0 ° C. or lower. It was.
JP-A-11-214025

  However, the above-described conventional fuel cell system has a problem in that the amount of fuel consumption increases because the freezing is prevented by starting the fuel cell when the outside air temperature decreases.

In order to solve the above-described problems, a fuel cell system according to the present invention includes a fuel cell that generates electricity by reacting a fuel gas and an oxidant gas by an electrochemical reaction, and a refrigerant for cooling the fuel cell. A cooling system that cools the refrigerant according to a target temperature that is a control target value of the temperature of the refrigerant while circulating between the battery, an outside air temperature detecting means that detects an outside air temperature, the fuel cell, and the cooling system. And a control means for controlling the fuel cell system, wherein the control means is set according to a cooling request of the fuel cell during a power generation operation, and the fuel cell is efficient in consideration of characteristics of the fuel cell. when you are performing the temperature control of the coolant in accordance with the reference target temperature is a temperature at which it is possible to perform the power generation operation, the outside temperature is predetermined temperature determines the low temperature state detected by the outside air temperature detection means Even when small, characterized in that the target temperature of the refrigerant performing the Atsushi Nobori control for raising than the reference target temperature based on the outside air temperature.

In the fuel cell system according to the present invention, when the outside air temperature is equal to or lower than the predetermined temperature , the fuel cell can perform an efficient power generation operation in consideration of the target temperature of the refrigerant based on the outside air temperature and the characteristics of the fuel cell. it since as than the reference target temperature which is a temperature for implementing the Ru Atsushi Nobori control is increased, when the vehicle is stopped in a low temperature state, it is possible to maintain a high temperature of the coolant circulation system, the incubation time after stopping It can be extended longer than usual. As a result, the fuel cell can be prevented from freezing without starting and stopping the fuel cell as much as possible.

  Embodiments of a fuel cell system according to the present invention will be described below with reference to the drawings.

  Embodiment 1 of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram illustrating the configuration of the fuel cell system according to the first embodiment.

  As shown in FIG. 1, a fuel cell system 1 according to this embodiment includes a fuel cell stack 2 that is supplied with fuel gas and an oxidant gas and generates power by an electrochemical reaction, and a control device 3 that controls the fuel cell system 1. A refrigerant pipe 4 that circulates a refrigerant for cooling the fuel cell stack 2, a refrigerant pump 5 that circulates the refrigerant in the refrigerant pipe 4, a radiator 6 that dissipates the refrigerant, and a cooling air to the radiator 6. A radiator fan 7, a refrigerant tank 8 that stores circulating refrigerant, a bypass pipe 9 that bypasses the radiator 6, a three-way valve 10 that switches the flow path to the bypass pipe 9, and the temperature of the refrigerant that flows into the fuel cell stack 2 A refrigerant temperature sensor 11 for detecting and an outside air temperature sensor 12 for detecting outside air temperature are provided.

  In the fuel cell system 1 described above, in the fuel cell stack 2, hydrogen gas, which is fuel gas, is supplied to the anode, and air, which is oxidant gas, is supplied to the cathode, and power generation is performed by the following electrochemical reaction. .

Anode (anode): H2 → 2H ++ 2e- (1)
Cathode (Cathode): 2H ++ 2e-+ (1/2) O2 → H2O (2)
In the hydrogen supply system for supplying hydrogen to the fuel cell stack 2, hydrogen gas is supplied from a hydrogen tank (not shown) to the anode of the fuel cell stack 2 through a pressure reducing valve, a hydrogen supply valve, and the like.

  On the other hand, in an air supply system that supplies air that is an oxidant gas, air sucked from the outside is pressurized by a compressor (not shown) and supplied to the cathode of the fuel cell stack 2.

  In the cooling system for cooling the fuel cell stack 2, the refrigerant is filled in the internal refrigerant passage, the refrigerant pipe 4, the radiator 6, and the refrigerant tank 8 of the fuel cell stack 2. Then, the refrigerant is circulated between them by the refrigerant pump 5 to cool the fuel cell stack 2 with the refrigerant, and the heat of the refrigerant is radiated to the outside by the cooling air from the radiator fan 7 by the radiator 6. Yes. Further, the flow path is switched to the bypass pipe 9 side by switching the three-way valve 10 so that the refrigerant bypasses the radiator 6. Further, the refrigerant tank 8 stores the refrigerant and performs gas-liquid separation of the refrigerant.

  Based on the measured values detected by various sensors (not shown), the refrigerant temperature sensor 11, and the temperatures detected by the outside air temperature sensor 12, the control device 3 determines the rotational speed of the refrigerant pump 5, the amount of power generated by the fuel cell stack 2, The number of rotations of the radiator fan 7 and the switching of the three-way valve 10 are controlled. The control device 3 is constituted by a microcomputer including a CPU, a ROM, a RAM, and the like.

  Next, refrigerant temperature control processing by the fuel cell system 1 of the present embodiment will be described based on the flowchart of FIG. Here, the temperature control process shown in the flowchart of FIG. 2 is configured as a subroutine called from the main control process executed by the control device 3 every predetermined time (for example, 0.05 sec).

  When the refrigerant temperature control process according to the first embodiment is started, the control device 3 detects the outside air temperature T1 with the outside air temperature sensor 12 (S201), and temporarily stores the detected outside air temperature T1 in the internal memory. Then, it is determined whether or not the outside air temperature T1 is lower than a preset target temperature change start temperature Tlow (S202). This target temperature change start temperature Tlow is a value for determining a low temperature state in which the fuel cell stack 2 may freeze.

  When the outside air temperature T1 is equal to or higher than the target temperature change start temperature Tlow, the target temperature Ttarget of the refrigerant is set according to the target temperature of the refrigerant at the normal time, that is, according to the cooling request of the fuel cell stack 2 during the power generation operation. The set reference target temperature Tnormal is set (S203), the process proceeds to return, and the refrigerant temperature control process by the fuel cell system 1 of the present embodiment is completed. The reference target temperature Tnormal is set to a temperature state in which the fuel cell stack 2 can perform an efficient power generation operation in consideration of the characteristics of the fuel cell stack 2, and is acquired in advance through experiments and simulations, for example. A fixed value can be used.

  On the other hand, when the outside air temperature T1 is lower than the target temperature change start temperature Tlow in step S202, the control device 3 refers to a table stored in the internal memory to calculate the refrigerant temperature rise ΔT from the outside air temperature T1. (S204).

  Here, a calculation method of the temperature rise width ΔT of the refrigerant will be described. In the memory of the control device 3, as shown in FIG. 3, a table for calculating the temperature rise ΔT from the outside air temperature T1 is stored in advance as data, and the temperature rise width ΔT from the outside air temperature T1 based on this table. Is calculated. In the example shown in the figure, the temperature rise width ΔT and the outside air temperature T1 have a linear relationship such that the temperature rise width ΔT increases as the outside air temperature T1 decreases. From this table, the temperature rise ΔT is calculated as a value corresponding to the difference (Tlow−T1) between the target temperature change start temperature Tlow and the outside air temperature T1, and this calculated value is a provisional value of the temperature rise ΔT. Determined as a value.

  Further, at this time, the allowable limit temperature of the fuel cell stack 2 is obtained from the power generation amount of the fuel cell stack 2 with reference to the table shown in FIG. 4, and the tentatively determined temperature rise ΔT is determined as the refrigerant at the normal time. The target temperature (provisional value) of the refrigerant is calculated by adding to the target temperature (reference target temperature) Tnormal. Then, the temperature increase width ΔT is limited so that the provisional value of the target temperature is equal to or lower than the allowable limit temperature, and thereby the value of the temperature increase width ΔT is finally determined. The table shown in FIG. 4 is a table showing the relationship between the power generation amount of the installed fuel cell stack 2 and the allowable limit temperature, and is stored in advance as data.

  When the temperature rise width ΔT is calculated in step S204 in this way, the refrigerant target temperature Ttarget is then changed to the added value (Ttarget + ΔT) of the reference target temperature Ttarget and the temperature rise width ΔT (S205), and the refrigerant target temperature Ttarget is obtained. Is performed to raise the temperature above the reference target temperature Tnormal (S206). Thereby, the temperature of the refrigerant is changed to the changed target temperature Ttarget. Here, control for reducing the rotational speed of the radiator fan 7 and the refrigerant pump 5 and switching the three-way valve 10 to the bypass pipe 9 side is performed.

  When the temperature raising control is thus performed, the process proceeds to return, and the refrigerant temperature control process by the fuel cell system 1 of the present embodiment is finished.

  Thus, in the fuel cell system 1 of the present embodiment, when the outside air temperature T1 is smaller than the target temperature change start temperature Tlow during vehicle operation, the refrigerant target temperature Ttarget is set to be lower than the reference target temperature Tnormal based on the outside air temperature T1. The temperature rise control to raise was implemented so that the temperature of the refrigerant would rise. Therefore, the temperature of the refrigerant circulation system when the vehicle is stopped can be maintained higher than that during normal stop, and the heat retention time after stop can be extended longer than normal. As a result, the fuel cell stack 2 can be prevented from freezing without starting and stopping the fuel cell stack 2 as much as possible.

  Incidentally, in a stationary fuel cell, the power of sensors used for monitoring can be easily obtained from an external power source, but in a fuel cell installed in a moving body such as a vehicle, the power stored in the secondary battery is limited. Therefore, it may be necessary to start the fuel cell to charge the power required for monitoring. For this reason, the conventional fuel cell system has a problem that the fuel cell is deteriorated by meaninglessly repeating the start and stop of the fuel cell. However, in the fuel cell system 1 of the present embodiment, since the start and stop of the fuel cell stack 2 can be minimized, deterioration of the fuel cell can be suppressed.

  Further, in the fuel cell system 1 of this embodiment, the temperature rise width ΔT of the refrigerant is determined according to the difference between the target temperature change start temperature Tlow and the outside air temperature T1, and this temperature rise width ΔT is determined as the normal target temperature ( Since the refrigerant target temperature Ttarget is calculated by adding to the reference target temperature Tnormal, the refrigerant target temperature Ttarget can be accurately calculated according to the outside air temperature.

  Furthermore, in the fuel cell system 1 of this embodiment, the allowable limit temperature of the fuel cell stack 2 is determined based on the amount of power generated by the fuel cell stack 2, and the target temperature Ttarget is limited to be equal to or lower than the allowable limit temperature. Therefore, it is possible to prevent the fuel cell stack 2 from deteriorating when the temperature of the fuel cell stack 2 exceeds the allowable limit temperature.

  Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 5 is a block diagram illustrating the configuration of the fuel cell system according to the second embodiment. As shown in FIG. 5, the fuel cell system 51 of the present embodiment is different from the first embodiment in that it further includes a heat retention switch (selection means) 52 that selects whether or not to perform the temperature rise control. Since other configurations are the same as those of the first embodiment, detailed description thereof is omitted.

  Subsequently, the refrigerant temperature control processing by the fuel cell system 51 of the present embodiment will be described based on the flowchart of FIG. Here, the temperature control process shown in the flowchart of FIG. 6 is configured as a subroutine that is called from the main control process executed by the control device 3 every predetermined time (for example, 0.05 sec).

  When the refrigerant temperature control process according to the second embodiment starts, the control device 3 detects the outside air temperature T1 with the outside air temperature sensor 12 (S301), and temporarily stores the detected outside air temperature T1 in the internal memory. Then, it is determined whether or not the outside air temperature T1 is lower than the preset target temperature change start temperature Tlow and the heat retention switch 52 is ON (S302). Here, the target temperature change start temperature Tlow is a value for determining a low temperature state in which the fuel cell stack 2 may be frozen.

  Then, regardless of whether the heat retention switch 52 is ON or OFF, the heat retention switch 52 is OFF when the outside air temperature T1 is equal to or higher than the target temperature change start temperature Tlow, or even when the outside air temperature T1 is smaller than the target temperature change start temperature Tlow. Is set to the refrigerant target temperature (reference target temperature) Tnormal at the normal time, and the output is the response speed (output / time) when the output of the fuel cell stack 2 is changed. The response speed Vacc is set to the output response speed Vnormal at the time of normal control (S303), the process proceeds to return, and the refrigerant temperature control process by the fuel cell system 51 of the present embodiment is finished.

  On the other hand, if the outside air temperature T1 is lower than the target temperature change start temperature Tlow in step S302 and the heat retention switch 52 is turned on, the control device 3 refers to the table stored in the internal memory and performs an external operation. A temperature rise width ΔT of the refrigerant is calculated from the temperature T1. Here, the calculation method of the temperature rise ΔT of the refrigerant is the same as that in the first embodiment, and the temperature rise ΔT is calculated from the outside air temperature T1 based on the table shown in FIG. Similarly to the first embodiment, the allowable limit temperature of the fuel cell stack 2 is obtained from the power generation amount of the fuel cell stack 2 based on the table shown in FIG. 4 at this time, so that the target temperature of the refrigerant is equal to or lower than the allowable limit temperature. To limit the temperature rise width ΔT.

  When the temperature rise width ΔT is calculated in step S304 in this way, the refrigerant target temperature Ttarget is then changed to Tnormal + ΔT (S305), and then the output response speed Vacc of the fuel cell stack 2 is changed to the output response speed during normal control. A value Vlow smaller than Vnormal is set (S306). Here, the change in the output response speed of the fuel cell stack 2 will be described with reference to FIG. As shown in FIG. 7, the output response speed Vacc is decreased from Vnormal to Vlow during normal control, thereby suppressing a rapid increase in the output of the fuel cell stack 2. However, the range of decrease in the output response speed Vacc is the allowable limit of the fuel cell stack 2 in which the temperature of the refrigerant accompanying the temperature increase of the fuel cell stack 2 due to the output response speed Vnormal during normal control is obtained in advance by experiment or calculation. Set so as not to exceed the temperature.

  Then, temperature increase control is performed to raise the target temperature Ttarget of the refrigerant above the reference target temperature Tnormal (S307). Thereby, the temperature of the refrigerant is changed to the changed target temperature Ttarget. As the temperature increase control, control is performed such as reducing the rotational speed of the radiator fan 7 or the refrigerant pump 5 or switching the three-way valve 10 to the bypass pipe 9 side.

  When this temperature increase control is performed, the process proceeds to return, and the refrigerant temperature control process by the fuel cell system 51 of the present embodiment is terminated.

  As described above, the fuel cell system 51 of the present embodiment includes the heat retaining switch 52 that selects whether or not to perform the temperature raising control, and only when the temperature raising control 52 is selected by the heat retaining switch 52. Since the temperature increase control is performed, it is possible to select whether or not the temperature increase control is performed according to the state of the fuel cell system 51, and wasteful power is consumed when the temperature increase control is not necessary. Can be prevented. Further, when it is not desired to reduce the output response speed of the fuel cell stack 2, the operation can be performed without decreasing the output response speed by turning off the heat retaining switch 52. Furthermore, the temperature increase control can be performed only when necessary by turning on the heat retaining switch 52 only when the temperature increase control is required, such as immediately before the fuel cell system 51 is stopped.

  In the fuel cell system 51 of this embodiment, when the temperature increase control is performed, the output response speed Vacc of the fuel cell stack 2 is set to the output response speed Vnormal during normal control, that is, the fuel cell when temperature increase control is not performed. Therefore, it is possible to prevent the stack temperature (refrigerant temperature) from overshooting and exceeding the allowable limit temperature due to heat generation of the fuel cell stack 2 during the transient response. In addition, it is not necessary to prepare a separate table for determining the temperature rise width ΔT in consideration of overshoot during transient response, and the target temperature of the refrigerant can be raised to a higher temperature.

  Next, Embodiment 3 of the present invention will be described with reference to FIG. FIG. 8 is a block diagram illustrating the configuration of the fuel cell system according to the third embodiment. As shown in FIG. 8, the fuel cell system 81 of the present embodiment further includes a load device 82 that uses the power generated by the fuel cell stack 2 and a secondary battery 83 that stores the power. 1 and other configurations are the same as those of the first embodiment, and detailed description thereof is omitted.

  The secondary battery 83 shown in FIG. 8 is charged with surplus power generated by the fuel cell stack 2 and compensates for a response delay in the transient response of the fuel cell stack 2. It is also used for power supply when the fuel cell stack 2 is started and stopped.

  Next, the refrigerant temperature control processing by the fuel cell system 81 of the present embodiment will be described based on the flowchart of FIG. Here, the temperature control processing shown in the flowchart of FIG. 9 is configured as a subroutine that is called from the main control processing executed by the control device 3 every predetermined time (for example, 0.05 sec).

  When the refrigerant temperature control process according to the third embodiment is started, the control device 3 determines whether or not the control for changing the target temperature of the refrigerant described in the first embodiment is performed (S401). If so, it is next determined whether or not the fuel cell stack 2 is in a transient response (S402).

  Here, a general method can be used as a method of determining whether or not the response is a transient response. For example, the previous request power to the control device 3 is stored in the control device 3 in advance, and when the current request power increases with respect to the previous request power, it is determined that the response is a transient response.

  If it is determined in step S401 that the control for changing the target temperature of the refrigerant is not performed, and if it is determined in step S402 that the fuel cell stack 2 is not in a transient response, the secondary battery 83 is used. The power amount Pacc at the time of transient response supplied supplementarily to the load device 82 is set to the normal amount of power Pnormal (S430), and the process proceeds to return, and the temperature control processing of the refrigerant by the fuel cell system 81 of the present embodiment Exit.

  On the other hand, when it is determined in step S402 that the fuel cell stack 2 is in a transient response, the amount of power at the time of transient response supplied from the secondary battery 83 to the load device 82 is determined from the normal amount of power Pnormal. Is set to a large amount of power Plow (S404).

  Here, the output change of the fuel cell stack 2 and the output change of the secondary battery 83 during the transient response will be described with reference to FIG. As shown in FIG. 10, during the transient response, more power is output from the secondary battery 83 than normal, and is supplied to the load device 82, whereby less power is output from the fuel cell stack 2 than normal. Is output and supplied to the load device 82. Therefore, during the transient response of the fuel cell stack 2, power is supplied from the secondary battery 83 to the load device 82 with priority over the fuel cell stack 2 for a predetermined time.

  Then, the value of the timer t for determining the power supply time is set to t + 1 (S405), and it is determined whether or not the value of the timer t is equal to or less than the power supply time t1 (S406). Here, the power supply time t1 is set based on a transient response time obtained in advance by experiment or calculation.

  When the value of the timer t is smaller than the power supply time t1, the routine proceeds to return, and the temperature control process for the refrigerant by the fuel cell system 81 of this embodiment is terminated. When the value of the timer t is equal to or longer than the power supply time t1, The power amount Pacc at the time of transient response supplied from the battery 83 to the load device 82 is set to the normal amount of power Pnormal (S403), and then the process proceeds to return, and the temperature control process of the refrigerant by the fuel cell system 81 of this embodiment is performed. Exit.

  As described above, the fuel cell system 81 of the present embodiment includes the secondary battery 83 that stores electric power. When the fuel cell stack 2 becomes a transient response when the temperature increase control is being performed, the fuel cell system 81 has priority for a predetermined time. Thus, since the power is supplied from the secondary battery 83 to the load device 82, the output of the fuel cell stack 2 can be reduced during the transient response, and thereby the stack temperature (refrigerant temperature) is generated by the heat generation of the fuel cell stack 2. Can be prevented from overshooting and exceeding the allowable limit temperature. In addition, since the amount of heat generated by the fuel cell stack 2 can be suppressed, it is not necessary to create a table in consideration of overshoot during transient response, and the target temperature of the refrigerant can be increased to a higher temperature.

  Further, in the fuel cell system 81 of the present embodiment, the power supply time is set based on the transient response time obtained in advance by experiment or calculation, so that the secondary battery 83 starts from the time required for the transient response. Electric power can be supplied to the load device 82.

  Although the fuel cell system of the present invention has been described based on the illustrated embodiment, the present invention is not limited to this, and the configuration of each part is replaced with an arbitrary configuration having the same function. Can do.

It is a block diagram which shows the structure of the fuel cell system which concerns on Example 1 of this invention. It is a flowchart which shows the temperature control process of the refrigerant | coolant by the fuel cell system which concerns on Example 1 of this invention. It is a figure which shows the relationship between external temperature and the temperature rise width of a refrigerant | coolant. It is a figure which shows the relationship between the electric power generation amount of a fuel cell stack, and the allowable limit temperature of a fuel cell stack. It is a block diagram which shows the structure of the fuel cell system which concerns on Example 2 of this invention. It is a flowchart which shows the temperature control process of the refrigerant | coolant by the fuel cell system which concerns on Example 2 of this invention. It is a figure for demonstrating the change of the output response time of a fuel cell stack. It is a block diagram which shows the structure of the fuel cell system which concerns on Example 3 of this invention. It is a flowchart which shows the temperature control process of the refrigerant | coolant by the fuel cell system which concerns on Example 3 of this invention. It is a figure for demonstrating the output change of a fuel cell stack and a secondary battery at the time of a transient response.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 51, 81 Fuel cell system 2 Fuel cell stack 3 Control apparatus 4 Refrigerant piping 5 Refrigerant pump 6 Radiator 7 Radiator fan 8 Refrigerant tank 9 Bypass piping 10 Three-way valve 11 Refrigerant temperature sensor 12 Outside temperature sensor 52 Thermal insulation switch 82 Load device 83 Secondary battery

Claims (7)

A fuel cell that generates electric power by reacting a fuel gas and an oxidant gas by an electrochemical reaction, and a coolant control target value for circulating the coolant for cooling the fuel cell between the fuel cell and the fuel cell A fuel cell system comprising a cooling system that cools the refrigerant according to a target temperature that is, an outside air temperature detecting means that detects an outside air temperature, and a control means that controls the fuel cell and the cooling system,
The control means is set according to a request for cooling the fuel cell during a power generation operation, and is a reference target temperature that is a temperature at which the fuel cell can perform an efficient power generation operation in consideration of the characteristics of the fuel cell. When the outside air temperature detected by the outside air temperature detecting means is smaller than a predetermined temperature for determining the low temperature state, the target temperature of the refrigerant is set based on the outside air temperature. A fuel cell system that performs temperature rise control for raising the temperature from a reference target temperature.   The control means determines a temperature rise width of the refrigerant according to a difference between the predetermined temperature and the detected outside air temperature, and adds the temperature rise width to the reference target temperature to thereby set the target temperature of the refrigerant. The fuel cell system according to claim 1, wherein the fuel cell system is calculated.   The control means determines an allowable limit temperature of the fuel cell based on a power generation amount of the fuel cell, and limits the target temperature to be equal to or lower than the allowable limit temperature. Item 3. The fuel cell system according to any one of Items 2 to 3. A selection means for selecting whether or not to perform the temperature increase control;
4. The fuel according to claim 1, wherein the control unit performs the temperature increase control when the selection unit selects execution of the temperature increase control. 5. Battery system.   2. The control means, when performing the temperature increase control, lowers the output response speed of the fuel cell to be lower than the output response speed of the fuel cell when the temperature increase control is not performed. The fuel cell system according to any one of claims 1 to 4. Load equipment using the power generated by the fuel cell;
A secondary battery for storing electric power,
When the fuel cell becomes a transient response when the temperature increase control is being performed, the control means gives power to the load device with priority over the secondary battery for a predetermined time over the fuel cell. The fuel cell system according to any one of claims 1 to 5, wherein the fuel cell system is supplied. The fuel cell system according to claim 6, wherein the predetermined time is set based on a transient response time obtained in advance by experiment or calculation.

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